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Project: Pioneer SX-3800

Super Noob

Super Noob

Super Member
Few weeks back, I stumbled on a local Fluoroscan. It was non-working and was concerned that the outputs many have been blown (from what I read).

Though not the top of the heap SX-3900, the SX-3800 boasts 60 WPC (not too shabby).

Here is how she arrived.
ACtC-3c4y3et4e5zjXp2zvbLL87tAA6c_nJOm-yuYMIPovjRwmYateVKT_hxK6oiJEQPZ0bGwbeevWMm5x2WOPbItH9yygnVCopVVFZOWXDW60L3MVA9cU8Bz-RcF4XuPzIhlbofETyCVLajpenmE9X4uAVo=w1218-h913-no


It would not pass the DBT... so here is where I deviated from the typical scrip of fixing an issue before rebuilding. In order to work on the power supply and amp board = some disassembly required.
ACtC-3cfl0XvTh75sQs4G4oJlQfI45LrcVwyXz78GbSkCBpyGUZR-LwSwltuJos-nchY9DmghDg84mXni-B4sEgl3lxRlOJnm8e91j72DoIjPCotH8sIlWZ0OFWJEgtWFRHJ1WkiG1mdTpvZ9jMZE61dtkDj=w1218-h913-no

To get access, I de-soldered the rows of wire wrap modules form the boards.

Pic of the outputs:
ACtC-3cItF24-mkRrYo10OrRgxpFqtsr5t9rgDtZ7v3qqnJ856JLG-eXvouQ-Dtzlx30YZLwZ8WcZImibeTkDgRVdvrJA27kIgq7rKGfeWccF9bUAiiUh5ELFv3LM-rmoGY1zX3cNPVKkrO8swkR8fcsln9e=w1218-h913-no

All were changed - what a mess.

Let get the build post rolling.
 
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Power Supply Assembly (GWH-122) 'B' Version

Capacitors:
C202 220 uF 80v Electro-CEA / Nich UPW 220 uF 100v UPW2A221MHD
C203 220 uF 80v Electro-CEA / Nich UPW 220 uF 100v UPW2A221MHD
C206 10 uF 50v Electro-CEA / Nich UPW 10 uF 63v UPW1J100MDD
C207 47 uF 50v Electro CEA / Nich UPW 47 uF 63v UPW1J470MPD
C208 47 uF 50v Electro-CEA / Nich UPW 47 uF 63v UPW1J470MPD
C209 47 uF 50v Electro-CEA / Nich UPW 47 uF 63v UPW1J470MPD
C210 47 uF 50v Electro-CEA / Nich UPW 47 uF 63v UPW1J470MPD
C213 470 uF 16v Electro-CEA / Nich UPW 470 uF 25v UPW1E471MPD
C214 470 uF 16v Electro-CEA / Nich UPW 470 uF 25v UPW1E471MPD
C215 1000 uF 35v Electro-CEA / Nich UPW 1000 uF 50v UPW1H102MHD1CV
C216 100 uF 25v Electro-CEA / Nich UPW 100 uF 35v UPW1V101MED
C217 220 uF 16v Electro-CEA / Nich UPW 220 uF 25v UPW1E221MPD
C218 47 uF 10v Electro-CEA / Nich UPW 47 uF 16v UPW1C470MDD
C219 470 uF 6.8v Electro-CEA / Nich UPW 470 uF 25v UPW1E471MPD
C223 2.2 uF 50v Electro-CEA / WIMA 2.2 uF 63v MKS2C042201K00JO00
C225 12000 uF 56v (~36mm x 60 mm) need to update with correct part #
C226 12000 uF 56v (~36mm x 60 mm) need to update with correct part #
C227 10 uF 50v Electro - CEA Nich UPW 10 uF 63v UPW1J100MDD
Filter Bypass Caps (Qty 2) Polypropylene 2.2 uF 450v ECW-FE2W225J

Transistors:
Q201 2SD313 MJE15032G
Q202 2SD34 JFET Retain
Q203 2SC2575 KSC2383YTA
Q204 2SC1915 KSC2690AYS
Q205 2SB682S / 2SB507 MJE15033G
Q206 2SD34 JFET Retain
Q207 2SA912 KSA1013YBU
Q208 2SA905 KSA1220AYS
Q209 2SD313 MJE15032G
Q210 2SD313 MJE15032G
Q211 2SC2575 KSC2383YTA

Diodes:
D201 10E2 1A / 100V RL202-TP 2A / 100V
D202 10E2 1A / 100V RL202-TP 2A / 100V
D203 10E2 1A / 100V RL202-TP 2A / 100V
D204 10E2 1A / 100V RL202-TP 2A / 100V
D205 10E2 1A / 100V RL202-TP 2A / 100V
D206 10E2 1A / 100V RL202-TP 2A / 100V
D207 KZL-140 14V 1/2 W Zener 1N5244B 14V 1/2 W Zener
D208 1S1555 1N4148 300mA/100v
D209 SR3AM-04 3A / 200V STTH3R04RL 3A / 400V Ultrafast Recover
D210 SR3AM-04 3A / 200V STTH3R04RL 3A / 400V Ultrafast Recover
D211 SR3AM-04 3A / 200V STTH3R04RL 3A / 400V Ultrafast Recover
D212 SR3AM-04 3A / 200V STTH3R04RL 3A / 400V Ultrafast Recover
D213 MZ177 18V 1/2 W Zener 1N5248B 18V 1/2 W Zener
D214 WZ-110 11V 1/2 W Zener 1N5241B 11V 1/2 W Zener
D215 1S1555 1N4148 300mA/100v
D216 WZ-140 14V 1/2 W Zener 1N5244B 14V 1/2 W Zener

ACtC-3ce3PY_t_hBt_RLFp9ubah6b5J_iRYnOkNPRpLQ7dIgd5rtoh33Zjd14OhilxBDz3LjnZ5LveLH4gCc4VIfrrNnC4kj_7S601wgFuiQ1HSTKJAKoJHUV-ijDXBKVR1hNxH9GOjljk5y1fzhXLsjf0Oe=w359-h665-no


ACtC-3cdkn0BxC4xsVoAqmDHRnB8yi77EQtAF2WSWTEm158PPXKezaxxlBm6-wqihQxFRU2TEbZmHp3XWy-apLOY1i02E1oyp6JwMSz9nl8LKtPSVM9LstMN6vwLxbVx1yNC695bVsSxaVQboKa_kfqlF8yv=w1041-h793-no


ACtC-3c2_NXm-Z5qvUlS0q6ZehxWlKO2Psd4Zc3G3yuUnlF69PC4Ne6lTPBFVXwOrboN3AZd4--kkEP5BkTfiVfbKJrWRU3kJpfj9LK_75iZ9UzoS1dCqQ6mcr9ItO3QmMbzqWsnAYkbyg4myCfqdorx0NOl=w1280-h583-no


My unit had a revisions "B" power supply board... some minor changes.

Before Pictures:
ACtC-3eK4r118LpsgV6f_O37RKqr-o2T2zyQPwX92Fbi13g2PeQoCPJrID3z2hpVpC6sdxIPiBBwuRKr0DKDIvHayhnNd_JgXYRu4NExy_uUrw_ki8h3gUdIlZR115tKhJwO39DqxKp8McXdqaKK8-ZKXssJ=w1218-h913-no

Some Glue:
ACtC-3cGolJf5s91OyvlfpI5YjFiAFWNSvTZBxB_4obxU4WZDCuaVmYHNqyQjO_6ExZtI5hEHpKlYq02Lt4Aks_iSt9WyFpbNhDFzOsB6GGUnyaDJf2yed9Xum6h3ppLiJ4zb4XIgbBc2sXWLiguxGkqu2Dn=w661-h881-no

ACtC-3czomYoMPqn9C9ZoTqComtOov202FIG8fRSEoibkW9YV0YEsp0ZCYORRfDUZhzw0KBn2Bwsyf-UzfpBmtpCTtCioCYJRBYjLtw4hb6JVs23T5K8e6U8CQ1S0YvrZl53nStTqActnZt6hmJ1NJ8D-aB_=w661-h881-no


ACtC-3flJozKJwK56DQ5NtVmZJRFgdKcvCv-FOblr-Z0uKg_pAS_z6j6SdMPST_uUx8M8jjT1YmcU4DrFwrSCUVejwehM3Ig0UCZvmttflaorGcGI2TP1749Ui2RqDTt4TMe_WLA55NKYbzDrmO4-WBtWkFy=w685-h913-no

ACtC-3fGBJZTcWwwrX5c5OyyfofAcQtvTaV_-js0Sa3oqsTGTAn7zqN368iL7ofwf8H5hIn7tjr7MPEnvEbit5ytfLKw6n0kEd6Q0GO2wcJf8ezPvXpLB-bLut_cXXypmMxwUkbUEwZsHgm5z34IeeCHUZuI=w1218-h913-no

ACtC-3cBniNnZPSaeLGSb9TEUtjOSRXIQXVG3QtaYLoDMV1r08JVfrpOYUIiplvoLL6-BNWC_kZj_TOiygiL0pjD5TKCtsWNAY--z0kfmzgJam2Qk3_TsC_eOqeJzTp0LGeu0vLSaMdANPHUvYG2r_T5oNjd=w685-h913-no

ACtC-3eXyo_rMgbhZk3kav-Jj7jBLiUxnSbde81VzsbW97n92lyLPoS5gGbc2OaT5663LUqU5fDV0V5rOgjZPny1IkNKTZfryjxHIKj67SZLzA6tw2S7_IV7Cd3tI80BgHZZM5Gr4sF7tVO-6aGikdWf73Mv=w661-h881-no

ACtC-3e5ixc1YrbbazYBbL2WvnX9kyBn5Ij2nhawvy1-lZSB-Cm8k8dI4NsbKu7PxoMdmOnEGNJ_nKsn2jR9HnEwoPvHKC7eVnkLxdkaVBhxMORKanPRucoSe6zJhnftQVKOclWuDoMhQGqTiDZVeD8HO6AB=w661-h881-no

Bypass Caps:
ACtC-3eB5-2gvmLdpkRx6fEb1LD-t9OpTh9AJ7S_N6j0OzxgGEACFBQY5QwUVm_BAuNgjmy7U_FLZfyuA7gjWxLe_L8yxaschlGs88elx4S0-jY6dfKpcuz0r3DGuHIxsPovMSNOY2QVS8XwiYOFDPYg6WD6=s881-no


ACtC-3eosK7rFHwHSbmtHKLthep8qdE8b6WCIU02WjJyEO0Lj7FtIRkEinE7u4EpfE8DCzYVQT5JEUyDHA6Xw01p-KB6G4Sanilzxt0XtCVVq3EudEAH_Uu0errcDqJfFlRBwObm2qwI-m-dNjN_26MtlpDc=w685-h913-no


ACtC-3fOE3qil79C40hdrzj_KocaTp5uDGsB6Mp1yaLjo61NVMCrD27l0oz3eHMOOwRJT-8u53ZlHnBeUXtnjsHcvSfhd85EgTd13cEuSkKxu5l__vY8U4XtAGjq8O-mjJWMIVR9tGUDFr1FWFy00ddA9b2e=w685-h913-no

ACtC-3d9dBMVP4sYg5_--MZZk_Sto0rpXxiZpL6UQ6eytWfpkOycI93HJRhwhwVnx0SJJQywwJBJRiHzTjRfLFTcSZclLp-7L0PY6s0nm28kTpsMrgVsj9EfIJzZaxaMIFGo-jUawjREQKVo62PRs9M5XnfP=s913-no

ACtC-3e__IRLgdJhSeUb1UtQ9tKUb1yTzJuDaUGNUOaGlA6RACgsTrqoECY9bqt45tYYVe29xbixDBM-P_k-hktl2-4Y3AFNgg2ygcuOUwqvuvLhnCA_YFJwANqFvqvWqhIyVUaVRGhIZTrmYPpavnHkQZQG=s913-no

ACtC-3fv2ryO6Xh_viO3XmeSqSc9vAGI19ZyA1jlXfDX-er6fBOizmZ9TqfBsfvINBgUSyyuYzW8-w7fMu-r8UQW6cJKAaSQcRDdz3AHs-sKwRJNKJH7I_LSeBYmh-HzIWDtWYmNT4rBYUDVT5ig8VwaU8KJ=w661-h881-no


ACtC-3fL2yKFr2I_wU55_o2uFCHMhBHjbLYzitAKIx7NFCeMpUuslf2gSeyIambNCqNUNZ8hhnR4Il91mEAsLAcwi6dqD7YgxO1ntY9SkvNjvwOxzWY3oJeVhJov4CEztX5fegMj9NlVjZ39ILp-MgMij_l1=w685-h913-no
 
Last edited:
Power Amp (GWH-139)

Capacitors:
C101 4.7 uF 50v Electro (CEA-NL) WIMA 4.7 uF 50v MKS2B044701K00KSSD
C102 4.7 uF 50v Electro (CEA-NL) WIMA 4.7 uF 50v MKS2B044701K00KSSD
C117-C120 0.01 uF 50v Film WIMA 0.01 uF 250v MKS2F021001B00JO00
C125 0.22 uF 50v Electro (CEA-NP) Nich Fim 0.22 uF 50v QYX1H224KTP
C126 0.22 uF 50v Electro (CEA-NP) Nich Fim 0.22 uF 50v QYX1H224KTP
C133 470 uF 6.3V Electro (CEA) Nich UPW 470 uF 16v UPW1C471MPD1TD
C134 100 uF 25v Electro (CEA) Nich UPW 100 uF 35v UPW1V101MPD

Transistors:
Q101-Q102 2SC1775 90v, 50ma, .3w, 200 MHz, 400-1200 HFE KSC1845FTA
Q103-Q104 2SA979 Dual Package (retained)
Q105-Q106 2SC2291 Dual Package (retained)
Q107-08, Q111-12, Q117-18 2SA750 50v, 50ma, .25w, 100 MHz, 450 HFE KSA992FBU
Q109-Q110 2SC1915 120v, 50ma, .8w, 200 MHz KSC2690AYS
Q113-Q114 / Q119-Q120 2SC1400 100v, 50ma, .8w, 100MHz, 500 HFE KSC1845FTA
Q115-Q116 2SA905 120v, 50ma, .8w, 200 MHz, 150-800 HFE KSA1220AYS
Q121-Q122 3SC904A 90v, 50ma, .25w, 150 MHz, 250-1200 HFE KSA1220AYS
Q123-Q124 2SC1914 90v, 50ma, .25w, 150 MHz, 250-1200 HFE KSC2690AYS
Q125-Q126 2SC2275 120v, 1.5A, 25W, 200 MHz, 150 HFE (retained)
Q127-Q128 2SA985Q 120v, 1.5A, 25w, 180 MHz, 150 HFE (retained)
Q129-Q133 (found 2SC2320) 2SC2575 50v, .2A, .3w, 200 Mhz, 90-800 HFE KSC2383YTA
Q139 (found 2SA1015Y) 2SA1100 KSA1015
Q140 2SC1384 60v, 1a, .75w, 200 MHz, 160 HFE KSC2690AYS

Output Plugs 651-1757022 (Qty 4 )

Two (2) 2SA1075 PNP, 120V, 12A, 7V Vebo, 1.8V Sat, 60-200 HFE, 45 to 60 MHz MJL1302AG PNP, 260V, 15A, 5V Vebo, 75-150 HFE, 30 MHz
Two (2) 2SC2525 NPN, 120V, 12A, 7V Vebo, .7v, 60-200 HFE, 50-80 MHz MJL3281A PNP, 260V, 15A, 5V Vebo, 75-150 HFE, 30 MHz

Diodes
D101-106 WZ-061 6.1V .5W Zener / 1N5234B 6.2V, .5 Zener
D111-112 10E2 1A 100V / RL202-TP
D113-116 1S1555 / 1N4148
D123-D125, D128 1S2471 / 1N4148
D126 WZ-150 15V, 1/2 Watt / 1N5245B 15V, 1/2 Watt, Zener

ACtC-3fDrRJLKV-G5w50jMxaP2Z-jyAT8BLE4I4WvKJjTZdykJm4SXPUAUl1MYV55fbpygf1-JaP6G2RT7dgBbtydULswzSBEyg39OuN3luh6O14hon1adyL52ebmDxGStuGq9wdQyNplUNME4vy_n69dTIv=w319-h755-no

ACtC-3c_2Dcq7Tr2gyChPFztL_pBOtQ3aV0ijAyCjpR7ZxSYNN9vQsBUR44KZqiE9UoEUDAnFeS41I9hP5ff3gsP1MQfal4oHzyT5M2C4Ur8XnlwGTSIxPmJbBBnxjctbMPwmb1xJLRztoyl6YYv6Sxil6Lq=w1000-h774-no

ACtC-3dw4QFWd1TlNQFGmiRBbZEsP6oSvPSBE5uvO-CnTdO3S7fH7uJJ5kelBNrtRcdgbLpxM0d0stHgEBvwD8OvlXOYjsw7-eyD8dnsF2oSx_Fmi77aZf-viCQfwsAGABWpzf29CvyS6mRwZnC06JS_gTb1=w1172-h716-no


Board had some burnt resistors and new outputs are the only way to go at this point.

Before:
ACtC-3crEiEumD_AcTZBMB-UG3lAkEnM9cfVOQ5jnsmitwvB69LD58P_v1iotDjKkrS_8nA7ibKiuB2Z96SMi6Otej75WLmk8rhrmLFCDTZuMFAOtiATgC2WSuYrd2ASLREQAX-_0VrF2bgsMluL2VyAfyyw=w1175-h881-no

All resistors lifted and tested. Large drivers retained due to lack of a good replacement. Dual package input pair retained as well.
ACtC-3chlmvimO5V8pqeCFOFIZg2-UagGlUoLftCN5HgzoaCs0tv5Aa_s75Evk-OmUCstTGJZGa8Zyh2GbATvovDfNkKhmJQWp7UHf9y_zve5B3QrM6HklWdzHAOoj-0g4cGeVLLmJleMqBzSjGXC299dR3h=w685-h913-no


ACtC-3eEt6TW6Qnekv-oaq3v7I0UjrXGq-RHyulRY479fo_jEwC-cE_HjtyJPLSVlR188xRW-W3nyCea-s8h6eLQVm8y-_olxPQ_-c74PZfTbiyHst6m0VEgDPctaIcvlyMQIhcDNVNlP4U0N7n4vSL6fOTV=w685-h913-no


ACtC-3d1xzv74j1t753xKrluJNEAfJ_NfMNoywxEDHLaQjb-hF01Ejg4gZOWn3HhQkmw4Lf_UD0xxsfon0XrwWeVnIiElEbo0xnPWno_csI9rNbsXjQlRiVrxVL66ESzTk7_-AOAqQhtM1D1NOMo6KE8zTS1=w1175-h881-no


ACtC-3fsh4QNeJD5W2TpYTJuXmumWVY2DT_d_85uHzcgiuNPR8NI0AZmtcdUFzoAdm6aCKdmeLGkl0Ur_tzTsiOFZdLjpdt3-MvYMIZrM9UMbOizRCU8xf_5-5pIPZYSE2J6HidoiSx4qBlfXtQQKGue-Q1t=w661-h881-no

ACtC-3ejcf8ZZ8iZRjVK44VWq9L2WG72PO7ngIn41BeaDgZzsDuP45AhiMtbONX4SuEZha7clZdsd4V-1RYoQxNegI1-J2-QNudiWaWNv39Cah5lqltuOMoT--dBR_TF_yaftbHfx7N8UAyj43H6gHeyLMsz=w685-h913-no
 
Tone Amp (GWG-141)
C1 4.7 uF 50v Electro (CEANL - LL) / 4.7 uF 50v MKS2B044701K00JSSD WIMA
C2 4.7 uF 50v Electro (CEANL - LL) / 4.7 uF 50v MKS2B044701K00JSSD WIMA
C7 100 uF 10v Electro (CEA) / 100 uF 16v UPW1C101MED Nichicon (UPW)
C8 100 uF 10v Electro (CEA) / 100 uF 16v UPW1C101MED Nichicon (UPW)
C13 47 uF 25v Electro (CEA) / 47 uF 35v UPW1V470MED Nichicon (UPW)
C14 47 uF 25v Electro (CEA) / 47 uF 35v UPW1V470MED Nichicon (UPW)
C15 0.22 uF 50v Electro (CEANL - LL) / 0.22 uF 250v MKS2F032201H00KSSD WIMA
C16 0.22 uF 50v Electro (CEANL - LL) / 0.22 uF 250v MKS2F032201H00KSSD WIMA
C17 1 uF 50v Electro (CEANL - LL) / 1 uF 63v MKS2C041001F00JA00 WIMA
C18 1 uF 50v Electro (CEANL - LL) / 1 uF 63v MKS2C041001F00JA00 WIMA
C21 0.33 uF 50v Electro (CWANL - LL) / 0.33 uF 100v MKS2D033301E00JSSD WIMA
C22 0.33 uF 50v Electro (CWANL - LL) / 0.33 uF 100v MKS2D033301E00JSSD WIMA
C25 1 uF 50v Electro (CEANL - LL) / 1 uF 63v MKS2C041001F00JA00 WIMA
C26 1 uF 50v Electro (CEANL - LL) / 1 uF 63v MKS2C041001F00JA00 WIMA
C27 10 uF 50v Electro (CEANL - LL) / 10 uF 50V UKL1H100KDDANA Nichicon (UKL)
C28 10 uF 50v Electro (CEANL - LL) / 10 uF 50V UKL1H100KDDANA Nichicon (UKL)
C29 47 uF 50v Electro (CEA) / 47 uF 50v UPW1H470MED Nichicon (UPW)
C30 47 uF 50v Electro (CEA) / 47 uF 50v UPW1H470MED Nichicon (UPW)
C31 47 uF 50v Electro (CEA) / 47 uF 50v UPW1H470MED Nichicon (UPW)
C32 47 uF 50v Electro (CEA) / 47 uF 50v UPW1H470MED Nichicon (UPW)
C33 10 uF 50v Electro (CEANL - LL) / 10 uF 50V UKL1H100KDDANA Nichicon (UKL)
C34 10 uF 50v Electro (CEANL - LL) / 10 uF 50V UKL1H100KDDANA Nichicon (UKL)

ACtC-3eHF0JIXqS_aHEx-a8bAgr0fAGfGYUVQtTPJMNV4dkZEYLUAWMIKxWo2t-i4xUHMyS4heMjwiDz9XPTCCviX5GzCP7rgMw2RQoXLrW5DLsfyk3VjGYobTGFdnRpzF_gSFncyRHMAo_i4_cV_UeJ-YyY=w383-h443-no


ACtC-3dQhjo2t9A0ipGES0eVKYVQ_zyfBZdjU2twJG8KrU9DxnvlLvkY88Sb-zR9ZWhs0qaypKa4sbe9o7ivNmrl7USgPvahgQivPpYPD8oCrQPc6NG2IbHodRU01Brv-MoyjkMek9R906kmP8-2l5o63uTp=w1039-h709-no

ACtC-3fIuquBHQezyVWSo9KRWgpE0RmExIfqHZykPx7EV5dDOmeSyWuEScVYfhLIuXw9FbPF0Y_MbN0Pa8SpN6OTaKWuhwUabvcnd5tEifDzb6aFHff8K_tuhDM4nFLhOKLYP1V-nblfPdGik-J6UlfsLFLG=w1095-h764-no


Before:
ACtC-3f2Lp00rhA2J72mAYibO41KauULh7wFHrhdmhRaFiA24ajqcB9q8g2RVj14kCxH2X3rZXZf6dFdjMTyXjHTKFe7mH78b5aCLdydQcoQIHVqm7KEmICG7kXsQm71atMPtFywOjMzl68vlESg9vlr5ypx=w685-h913-no


ACtC-3ftVuJDzNLnT35ab05uFAvQqjG2NhL7sRfZaSmgYwEHhBiQ0SeVXvGjAO4RQAL1x-3mcd2K4C3G6EX7RPHzfIb6KMVLv1AB8rBSM_POwXt4WBjjw1KifpLjS6wzO8qVZeVmkYqhlRLocHmqialUI6jx=w1175-h881-no


Starting to disassemble toggle slides on units moving forward.
ACtC-3dyCfjfMuMK6xAcLwxvMgzXZ0F_iCuGyCMY9NBqR87aF77bA1sWjE0MlFHQTGRQlQzOSa_3fTa7NNAVqUGmNemZzqhpKnOan8U7erE_FHSfZ51cbsuqLBrhWmx6yJeuNmSRaBSH1U3N9Wvh_rWmuvEv=w685-h913-no


ACtC-3de7-RNOBFFixZoUHVgtnFBAp0xIZ_L87sgS8RJc9jXNGWvIPlIeI00Qa-ibJV5N0J_2itdLcFyuciRiygJfILWSFwekpv2Sp8eOM91xc04f7J0RLkxJU8-RSSaCr94dr8TvBjhAzourZ6aElwNAVd2=w685-h913-no


ACtC-3fUuVKNTam7k9O3dkDEvh3mIYq3IyTRVn7a8jr8QqWD9fndOyH0ORMrM7usfQaPzkMEClSs-XWJNI1FrEOmv9DSUSF9WObAgDTFMxlilsZ58Esm82bkamL_vrxWKeDwseOMg_Staq5VkfBAdQt5gsUx=w661-h881-no


ACtC-3ez7FzYimkBHp_M8SJ9xUnUriqTKYshdXdJpcmzZ7N_Zzli7OmTnI8n_P4RgiSthKzN_QFfDvrnBmIkSZUF7GQIF1sZAEI9hDhnpeREd4kCGHbGpc3frA7d04YWBSYxlr4Qu0TCCyUFSoByoYpYoBhS=w685-h913-no


ACtC-3eY5-g9sXlJ5PPpiT86l8I73RLcOli7srbovGR3cDQgBdNoKsdJjimZ1GIbCIOIAUcIBxPhtOE_eBd3asjl0QZwuTJzah4KU3swefnVOB2Hs6HJyFvNUWYaM5z9zoaQgnEEoBdIOgTwwmux-e_3ci9D=w661-h881-no


After:
ACtC-3fpHjzGvSSDo8oDogoOFP-P17qonB4hQBE4Nry5-qw5lbtRpIPl7J7irhERzou7k23kp0vyfMsgDcZKXYjgOp_01SE4dktJU6ckVNuEA3HSX8ShhDlqhtfPgHllqiGm9y7yfZfNcuIIP6z46XNZHFI6=w685-h913-no
 
Equalizer (AWM-227)
C1 47 uF 50v Electro (CEA) / 47 uF 50v UPW1H470MED Nichicon (UPW)
C2 47 uF 50v Electro (CEA) / 47 uF 50v UPW1H470MED Nichicon (UPW)
C3 4.7 uF 50v Electro (CEANL) / 4.7 uF 50v MKS2B044701K00JSSD WIMA
C4 4.7 uF 50v Electro (CEANL) / 4.7 uF 50v MKS2B044701K00JSSD WIMA
C9 470 uF 6v Electro (CEA) / 470 uF 16v UPW1C471MPD Nichicon (UPW)
C10 470 uF 6v Electro (CEA) / 470 uF 16v UPW1C471MPD Nichicon (UPW)
C21 47 uF 50v Electro (CEA) / 47 uF 50v UPW1H470MED Nichicon (UPW)
C22 47 uf 50v Electro (CEA) / 47 uF 50v UPW1H470MED Nichicon (UPW)
C23 4.7 uF 50v Electro (CEANL) / 4.7 uF 50v MKS2B044701K00JSSD WIMA
C24 4.7 uF 50v Electro (CEANL) / 4.7 uF 50v MKS2B044701K00JSSD WIMA

ACtC-3cncIAxbb0H8L9vDkWZAZjnuhBRvGbiHE9yazn0Z6eF53etH8NSPOOTyURrSkG9DSWEHhkBjjPpTDtFSa2KYgvVczkhU4A8EHggA2MwLbF2uOXjqhaDmitJFUlCjPhw24ST83iUot9P8s7cJ41TRcBS=w461-h413-no

ACtC-3dRj27zPDxdREVDojnGByD72NmpslQwnCsdaNjVRKDhwakj1CrAJONeZ1nE8vkDUvp4EmNMnPkRqOlTkyNMvXa_cHPzFqehXa0z8twiYNF2I01Hbb-ZZ_Utt4spPs2O1JcnTSOGjd6dXI-j19014Mb5=w1043-h881-no

ACtC-3ceCTdWiVSQBPDM4q7fadraVhmOR78X6DvOtpHoYsMHX4zpxT0wSk3MXqVnbXBVxT57Hu0WlZnKZmVjBlYno-4-OHKWA1UUwAT1_MGb_HYVix6fpjCZTCuGxaixCCG6XAu7dirOd7gpHAVB3EZxd40S=w1280-h640-no

ACtC-3ci6Ni6LccVzaVd-8TmrifwMIBc-kxVVqS-Ez8bFTSacIr0bUUcR3ub0Q6n6jR4TVQSF5ogJ6pFqcZAHPTGgMjicqT7tc2MNe4F7iXDpbNIdc8Ohocff6u_S-fZZbdE8phuCD8nFtvkzyHqYTBsdWXW=w661-h881-no


ACtC-3dcFTeywKUGQlL_EBjlfZI8kLqec6guv0-szNhbPrt0C2OAfs2bH0NLk0Bib-NCZc3lj0m-1KSfBTygbt3Juk_zzdKgLRb7ocp32e8q7KSGFxKhmf-_KYxyKaf5Z-aEYpu_o8KF9i37Xd8MjKBnpV5n=w661-h881-no

ACtC-3dfu1RYwvatstRY6dXxhNbr1QZcj-myjeDlzKVkFUBD5anq4fxuq9J8smaiUQjxhug72ep-I6e2t-wXqKAJ0anldoWOhlz3yRsEw7t58Lg87jYlegV-DWmQzn9H3OFwCoApIuhTtGvsfZPYHsuSaWRR=w685-h913-no


After:
ACtC-3evElhH2xWp5J-igd9JKn7_B3vvajPkybTmQMNYOadNFL1OaCyaSyMOmIyhPF-_Wuy8mvTM0HrHSMbR-DRFQK9lktilYcRMOtiZs0LfIITUMlH6ZDkiNTd5Aye7srdeabRnYhJEXhStluRxnYGejLC-=w661-h881-no
 
Tuner (GWE-133)
C3 47 uF 25v Electro (CEA) UPW 47 uF 35v UPW1V470MED
C4 47 uF 25v Electro (CEA) UPW 47 uF 35v UPW1V470MED
C12 220 uF 16v Electro (CEA) UPW 220 uF 25v UPW1E211MPD
C30 100 uF 10v Electro (CEA) UPW 100 uF 16v UPW1C101MED
C33 10 uF 50v Electro (CEA) UPW 10 uF 50v UPW1H100MDD
C36 100 uF 25v Electro (CEA) UPW 100 uF 35v UPW1V101MPD
C43 10 uF 50v Electro (CEA) UPW 10 uF 50v UPW1H100MDD
C51 470 uF 16v Electro (CEA) UPW 470 uF 25v UPW1E471MPD
C54 330 uF 10v Electro (CEA) UPW 330 uF 16v UPW1C331MPD
C63 2.2 uF 50v Electro (CEA) WIMA 2.2 uF 63v MKS2C042201K00JO00
C64 2.2 uF 50v Electro (CEA) WIMA 2.2 uF 63v MKS2C042201K00JO00
C65 1 uF 50v Electro (CEANL) WIMA 1 uF 63v MKS2C041001F00JA00
C66 1 uF 50v Electro (CEANL) WIMA 1 uF 63v MKS2C041001F00JA00
C69 10 uF 50v Electro (CEA) UPW 10 uF 50v UPW1H100MDD
C70 1 uF 50v Electro (CEANL) WIMA 1 uF 63v MKS2C041001F00JA00
C71 1 uF 50v Electro (CEANL) WIMA 1 uF 63v MKS2C041001F00JA00
C72 1 uF 50v Electro (CEA) WIMA 1 uF 63v MKS2C041001F00JA00
C73 22 uF 25v Electro (CEA) UPW 22 uF 35v UPW1V220MDD
C76 100 uF 10v Electro (CEA) UPW 100 uF 16v UPW1C101MED
C77 100 uF 10v Electro (CEA) UPW 100 uF 16v UPW1C101MED
C78 47 uF 25v Electro (CEA) UPW 47 uF 35v UPW1V470MED
C79 3.3 uF 50v Electro (CEA) WIMA 3.3 uF 63v MKS2C043301K00JSSD
C80 47 uF 10v Electro (CEA) UPW 47 uF 16v UPW1C470MDD
C83 100 uF 25v Electro (CEA) UPW 100 uF 35v UPW1V101MPD
C84 100 uF 25v Electro (CEA) UPW 100 uF 35v UPW1V101MPD
C85 470 uF 16v Electro (CEA) UPW 470 uF 25v UPW1E471MPD
C97 4.7 uF 50v Electro (CEA) UPW 4.7 uF 50v UPW1H4R7MDD
C98 3.3 uF 50v Electro (CEA) WIMA 3.3 uF 63v MKS2C043301K00JSSD
C103 0.22 uF 50v Electro (CEANL) WIMA 0.22 uF 250v MKS2F032201H00KSSD
Bonus CAP (not on schematic) WIMA 2.2 uF 63v MKS2C042201K00JO00

ACtC-3fZx2C3u-MVxffXUs3T4XjQTBCYMcduAfipyZJzjH33aJcI1EBwdCdGsL1m_4Ic308VaRITgEyNwMdYxuRWMl5qDUn_Y7cFnc8C-EbNOOUDOsczWmyoLL2c6cdqx8VVc-m8LVnV9t6L9qPrjZlOxOg9=w307-h757-no


ACtC-3ea0I9uqL4FLq64JHFVsGtkyUxMJl56VdiQINTjM8YOYEVT7GpR6W7PZgX-ln3up2yTiYuTafIBqNyVk5QcfCzHTU6FyFBK8fIzJ59OaE9dkXR7qclXUYSfkCN-InChLQscNZkoPobbFxYEhcT8XDam=w1258-h800-no

Before:
ACtC-3dplDHMBypL-8xfH9Mequx--diqCx8yDgqgGNRVNlpz2nwAumG6I3LkM1d2mFtmT9ed1NvlmYh92zZ9Ez1ilis0AxLkVZkrAhUEJV8gGb76F98v0R2NouN0jNx9rzqLrUn_mqAweooI1Tl57jSO4mvl=w685-h913-no

ACtC-3fFyFzyOTAVVZKllIL2CAmnOFJAwCdG6eZnW5gxQ9e0V0K6ADnZMfO37pcfgZjlEOI9mLbOXr6ShQvO_vuzRnuVRzlq9a6Fc6aQLc8KOvnmBZ9UI53Rz3ycdegT_jqAyeANMkEfzIbJxTHZFsWEDBFW=w661-h881-no

ACtC-3dkvkwioLEfkvMTIinypZwWILBi6oqS9kIxVeOUJLlqyW73oZDb1tRQXEck0nUvBpjS-OUmbItR0XZUYFjY8v_qoO_YiE9hBpGGa1D1f2Jz4U7zilaX5hz2prXScTX_axJOyanBsjKBJBY4Et4ttLW4=w661-h881-no

After:
ACtC-3f_yBwQA7n9D9uIkN465e2ZOywqj6QtJoy0n0-C2cO5PcRKfJaDvyplQP7TuaRJCAhKQLdZFzUaiGrlonha08TIi8soUpTaqlU_nDJOWitFPp2UqJnF6uEmcJKj0J61HL7IKY4-azoBRboWK1h8DyTm=w685-h913-no

ACtC-3en3yMX6hPcduy8sUyTPe6J-pMw3a5QYdUuRHt0qxMIsV3bWxiTf--QAC-QfpvImShkVSk997BZApYSFjognimrYodihZqqXKNre5Cdtq39O-iSblhKGtRuAo8B0OFX_ySaXq6ESf2PJivm2y4q6uph=w1175-h881-no

ACtC-3dESKhYGGe7V-XiTtZDi6xkirCqGBShaXgGXIqRCy2h4H7TaBt0WlPcLHKVUdPZRHvtVG6KvQa3R12892XxlJV3vLyQkwTLuHF5zj6nS4CKy5IZbxwII4iusr30qSZL30F41yle-vmmrcHcyPnbZMvV=w1175-h881-no

ACtC-3c9WW1a-gQ3OIHLDBiwMQd7fQtbw6Z_Yr5UM5XXbHinZFtHBsukjq3mi0kUj5vcJrqFKTcgwsq19Y2gMedMk_zd_vpNwFhecj6EDLI6-LpFSPKqhugbU5Nd9hsDudJNszYFeBjL-QMlHb0WahxMf7cy=w661-h881-no
 
Indicator (AWV-009)
C1 1 uF 50v Electro (CEANL) KEMET 1 uF 63v R820C4100DQ60J or MKS2C041001F00JA00 WIMA
C2 1 uF 50v Electro (CEANL) KEMET 1 uF 63v R820C4100DQ60J or MKS2C041001F00JA00 WIMA
C4 0.47 uF 50v Electro (CEA) WIMA 4.7 uF 100v MKSD034701E00JSSD
C10 100 uF 25v Electro (CEA) UPW 100 uF 35v UPW1V101MPD
C16 470 uF 10v Electro (CEA) UPW 470 uF 16v UPW1C471MPD
C28 470 uF 10v Electro (CEA) UPW 470 uF 16v UPW1C471MPD
C31 220 uF 16v Electro (CEA) UPW 220 uF 25v UPW1E211MPD
C33 1 uF 50v Electro (CEA) KEMET 1 uF 63v R820C4100DQ60J or MKS2C041001F00JA00 WIMA
C34 1 uF 50v Electro (CEA) KEMET 1 uF 63v R820C4100DQ60J or MKS2C041001F00JA00 WIMA
C35 1 uF 50v Electro (CEA) KEMET 1 uF 63v R820C4100DQ60J or MKS2C041001F00JA00 WIMA
C36 1 uF 50v Electro (CEA) KEMET 1 uF 63v R820C4100DQ60J or MKS2C041001F00JA00 WIMA
C37 1 uF 50v Electro (CEA) KEMET 1 uF 63v R820C4100DQ60J or MKS2C041001F00JA00 WIMA
C38 1 uF 50v Electro (CEA) KEMET 1 uF 63v R820C4100DQ60J or MKS2C041001F00JA00 WIMA
C39 1 uF 50v Electro (CEA) KEMET 1 uF 63v R820C4100DQ60J or MKS2C041001F00JA00 WIMA
(moved over to KEMIT films for the 1uf due to back-order)

Some disassembly required.
ACtC-3dKeBlK6xbsnYclT7Fi7i-YfyT2hqWBUz7xm2tHVe2Gr5ImaFmOfVfF9FO0voHxA-F7oSV2U8JtcFJGYoUSlwkaBFpDcddKsuhm7_rsYcI3vDCnFXV7202_Z6OGaPy7bWg7bmAB-1wsWPN1je-JKeRo=w417-h443-no

ACtC-3fHOCuL-WF6td-0YYMF2UKhemmGlBzHiVovpYfGVoJ6ysuORj0kQ8xG9i7bQWcJeJ2Naytxzrr2dbPLbVsRoKXP48aZ6flWg745aMlhdRPamT_9iR8OpWnva4HDNfO5DRPkRQm7P2lmBAfeaZR7D4r7=w1261-h636-no

ACtC-3dkCVVlZeV7zserfecGqc5lIrUVeQobx0VLMqUfBjlJ1IQhP2kwcsYLfa8xCdPHLZrm4-mLZSe4djLED_z9PrquitupaOMnDhi0Hu7YtkqDT2aNAL-zzI7iR3loRAceAyWaNntNX4vCFpR3GMc6Uubh=w1060-h750-no


ACtC-3dtHCkWV162gvOn3CUFxOCZNR6n64GwOhlVeIH-TTNznMyFTBBsJ4123p7kxOvFNpgzZoTl99bwXxFGYRt5_eBn6wWgm_1Qoenrebk1VGH6EZGh7Ktkpgz_4joecEFfaASPXcaIR2IlOq6RCGZopS01=w661-h881-no


Before:
ACtC-3dosCMMmqFgvr_wMYs2-eNt_VVc3TR9hra-2NmrSnHjhd0bB7EEOS5KjYv15zElyqQ-S1NNmKgTkIB-zkxANZ6YO_fTmWvWQBpxk1qX2BaaOP4A1YL6-Kwb45Lx3GMtifqzdtvAF9aXKyWVZleX-LXj=w685-h913-no

ACtC-3fD_r8X4KlU6rGCjZLyjBX_z6gZ1hgQmkQ6B0kujzZ6ZdAdmJcmShhV-WM5h7OESPouQP_1Qq-e8IPB07c20Dyc7h5z2Z1NLqJk5bPxmYG7XWzw-1RQhqQyysdzs3ICx-M0OAyQ_97BCxVI1xuC_Pj2=w661-h881-no


After:
ACtC-3d6hNk1grk1FoLpUvdeBI-tx9kXidMf25UC01di5rhApMEtapEdZpUMWxgj8C1JyUV1djcrUqwhV-KJsBvcWUauLyUe_lfz8toB2R9fFSG9g0t2wv8g7fuLt1d73siphzw5U4tBcAvFlaTCcCoWdeqv=w685-h913-no

ACtC-3e8tDZxodAWmxi3f0R8a5s9KKOYNEA_0bcW6lP9N95hYPqi6u-E2jbIW2StODDoVZ3fMyPgRkGw5HxRMv15_B1ZQfpsoxXmnBLtjX0p9ntf2ad-UbjUo0Jbz-jSjppE77DGGewmJtLH3tYaWJGMoE0Q=w661-h881-no
 
You did it again! Man you killed it on this one - looks fantastic. Nice thinking on the bypass caps.

I really wanted one of these from this line about a year ago, there is a lot to like about them, they seem to be confused about their identity. They have SX-xx80 silver look (which I really like) combined with the awesome blue meters. Really an example of how manufactures/industry were changing.

Well, hows it sound? I remember watching the xraytonyb video on the 3900 and it looked (and he said) to be a real pain to work on. Judging from your photos it looks to be so. Pretty neat how the moved a lot of the controls towards the back.
 
I have 2 of these..one works great, the other lights up a 100 watt bulb on the dbt to 110%. I was kinda scared to work on it but your post helps alot , now I'm mostly mildly afraid..:)
 
Super Noob said:
Power Amp (GWH-139)

Capacitors:
C101 4.7 uF 50v Electro (CEA-NL) WIMA 4.7 uF 50v MKS2B044701K00KSSD
C102 4.7 uF 50v Electro (CEA-NL) WIMA 4.7 uF 50v MKS2B044701K00KSSD
C117-C120 0.01 uF 50v Film WIMA 0.01 uF 250v MKS2F021001B00JO00
C125 0.22 uF 50v Electro (CEA-NP) Nich Fim 0.22 uF 50v QYX1H224KTP
C126 0.22 uF 50v Electro (CEA-NP) Nich Fim 0.22 uF 50v QYX1H224KTP
C133 470 uF 6.3V Electro (CEA) Nich UPW 470 uF 16v UPW1C471MPD1TD
C134 100 uF 25v Electro (CEA) Nich UPW 100 uF 35v UPW1V101MPD

Transistors:
Q101-Q102 2SC1775 90v, 50ma, .3w, 200 MHz, 400-1200 HFE KSC1845FTA
Q103-Q104 2SA979 Dual Package (retained)
Q105-Q106 2SC2291 Dual Package (retained)
Q107-08, Q111-12, Q117-18 2SA750 50v, 50ma, .25w, 100 MHz, 450 HFE KSA992FBU
Q109-Q110 2SC1915 120v, 50ma, .8w, 200 MHz KSC2690AYS
Q113-Q114 / Q119-Q120 2SC1400 100v, 50ma, .8w, 100MHz, 500 HFE KSC1845FTA
Q115-Q116 2SA905 120v, 50ma, .8w, 200 MHz, 150-800 HFE KSA1220AYS
Q121-Q122 3SC904A 90v, 50ma, .25w, 150 MHz, 250-1200 HFE KSA1220AYS
Q123-Q124 2SC1914 90v, 50ma, .25w, 150 MHz, 250-1200 HFE KSC2690AYS
Q125-Q126 2SC2275 120v, 1.5A, 25W, 200 MHz, 150 HFE (retained)
Q127-Q128 2SA985Q 120v, 1.5A, 25w, 180 MHz, 150 HFE (retained)
Q129-Q133 (found 2SC2320) 2SC2575 50v, .2A, .3w, 200 Mhz, 90-800 HFE KSC2383YTA
Q139 (found 2SA1015Y) 2SA1100 KSA1015
Q140 2SC1384 60v, 1a, .75w, 200 MHz, 160 HFE KSC2690AYS

Output Plugs 651-1757022 (Qty 4 )

Two (2) 2SA1075 PNP, 120V, 12A, 7V Vebo, 1.8V Sat, 60-200 HFE, 45 to 60 MHz MJL1302AG PNP, 260V, 15A, 5V Vebo, 75-150 HFE, 30 MHz
Two (2) 2SC2525 NPN, 120V, 12A, 7V Vebo, .7v, 60-200 HFE, 50-80 MHz MJL3281A PNP, 260V, 15A, 5V Vebo, 75-150 HFE, 30 MHz

Diodes
D101-106 WZ-061 6.1V .5W Zener / 1N5234B 6.2V, .5 Zener
D111-112 10E2 1A 100V / RL202-TP
D113-116 1S1555 / 1N4148
D123-D125, D128 1S2471 / 1N4148
D126 WZ-150 15V, 1/2 Watt / 1N5245B 15V, 1/2 Watt, Zener

ACtC-3fDrRJLKV-G5w50jMxaP2Z-jyAT8BLE4I4WvKJjTZdykJm4SXPUAUl1MYV55fbpygf1-JaP6G2RT7dgBbtydULswzSBEyg39OuN3luh6O14hon1adyL52ebmDxGStuGq9wdQyNplUNME4vy_n69dTIv=w319-h755-no

ACtC-3c_2Dcq7Tr2gyChPFztL_pBOtQ3aV0ijAyCjpR7ZxSYNN9vQsBUR44KZqiE9UoEUDAnFeS41I9hP5ff3gsP1MQfal4oHzyT5M2C4Ur8XnlwGTSIxPmJbBBnxjctbMPwmb1xJLRztoyl6YYv6Sxil6Lq=w1000-h774-no

ACtC-3dw4QFWd1TlNQFGmiRBbZEsP6oSvPSBE5uvO-CnTdO3S7fH7uJJ5kelBNrtRcdgbLpxM0d0stHgEBvwD8OvlXOYjsw7-eyD8dnsF2oSx_Fmi77aZf-viCQfwsAGABWpzf29CvyS6mRwZnC06JS_gTb1=w1172-h716-no


Board had some burnt resistors and new outputs are the only way to go at this point.

Before:
ACtC-3crEiEumD_AcTZBMB-UG3lAkEnM9cfVOQ5jnsmitwvB69LD58P_v1iotDjKkrS_8nA7ibKiuB2Z96SMi6Otej75WLmk8rhrmLFCDTZuMFAOtiATgC2WSuYrd2ASLREQAX-_0VrF2bgsMluL2VyAfyyw=w1175-h881-no

All resistors lifted and tested. Large drivers retained due to lack of a good replacement. Dual package input pair retained as well.
ACtC-3chlmvimO5V8pqeCFOFIZg2-UagGlUoLftCN5HgzoaCs0tv5Aa_s75Evk-OmUCstTGJZGa8Zyh2GbATvovDfNkKhmJQWp7UHf9y_zve5B3QrM6HklWdzHAOoj-0g4cGeVLLmJleMqBzSjGXC299dR3h=w685-h913-no


ACtC-3eEt6TW6Qnekv-oaq3v7I0UjrXGq-RHyulRY479fo_jEwC-cE_HjtyJPLSVlR188xRW-W3nyCea-s8h6eLQVm8y-_olxPQ_-c74PZfTbiyHst6m0VEgDPctaIcvlyMQIhcDNVNlP4U0N7n4vSL6fOTV=w685-h913-no


ACtC-3d1xzv74j1t753xKrluJNEAfJ_NfMNoywxEDHLaQjb-hF01Ejg4gZOWn3HhQkmw4Lf_UD0xxsfon0XrwWeVnIiElEbo0xnPWno_csI9rNbsXjQlRiVrxVL66ESzTk7_-AOAqQhtM1D1NOMo6KE8zTS1=w1175-h881-no


ACtC-3fsh4QNeJD5W2TpYTJuXmumWVY2DT_d_85uHzcgiuNPR8NI0AZmtcdUFzoAdm6aCKdmeLGkl0Ur_tzTsiOFZdLjpdt3-MvYMIZrM9UMbOizRCU8xf_5-5pIPZYSE2J6HidoiSx4qBlfXtQQKGue-Q1t=w661-h881-no

ACtC-3ejcf8ZZ8iZRjVK44VWq9L2WG72PO7ngIn41BeaDgZzsDuP45AhiMtbONX4SuEZha7clZdsd4V-1RYoQxNegI1-J2-QNudiWaWNv39Cah5lqltuOMoT--dBR_TF_yaftbHfx7N8UAyj43H6gHeyLMsz=w685-h913-no
Click to expand...
Hey, so I didn't want to bother you with this, but I can't figure out what you may have used for VR1+VR2. Did you go up to 500k? The manual I have says that they are supposed to be 330k but I have 470k factory installed. VR3-VR6 I think I have figured out. Any way do you remember what you used? Thanks
VR1-VR2...? these look ok to me...652-3362W-1-504LF 500k OHM
VR3-VR4...652-3362W-1-101LF 100 OHM
VR5-VR6...652-3362W-1-104LF 100K OHM
 
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Sorry…. but I don’t recall.
Go with 500k. Looks like I went with multi turn there with adjustment on the front. Just study the data sheet on the trimmer and sure you will find one that works.

Best of luck.
 
any trix to getting to the guts of the switches, do they all have pot-metal tabs you have to bend out and in to get to the goods?
 
grinx76 said:
any trix to getting to the guts of the switches, do they all have pot-metal tabs you have to bend out and in to get to the goods?
Click to expand...
Clean living, prayers, and vitamins.

No seriously… you got be patient to carefully bend back retainer tabs - not easy / not impossible.
 
Before:
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1/8" x 3/4" x 12" Aluminum Flat Bar
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Use an old output to mark the hold down bars... cut with a Dremel cutting wheel.
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[/QUOTE]

I had the same idea in my A9 repair in this forum - to clamp all the transistors with this all aluminum busbar. But in this way, we put the transistor in a closed conductive frame, and it is not clear how the electromagnetic fields of induction and self-induction will affect each other, and whether this will lead to an increase in distortions. So I rejected that option. I also think that the new transistor case has only one screw for this very reason. How does this amp play, does it sound good?
 
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