Project: Marantz 2270

[Super Noob]

https://drive.google.com/file/d/16I55F1d64iaTnUjbR8JLqRBnqPeWSp2d/view?usp=sharing
(build details - list)

Completed this rebuild a few months back... just getting around to sharing the process (before I am too far away from it).

Not the easiest unit I have rebuilt / restored for sure. Not a perfect unit - but a good candidate for saving. Rebuilt and documented the 2275 previously.

Referred to many of recommendations on LeeStereo as the foundation for my rebuild.
https://audiokarma.org/forums/index...oration-and-upgrade-of-a-marantz-2270.793805/
Lee's work is always awesome and well documented.

Here is what I found:
* Unit was stored standing on back of the wood case, and along way the case suffered water damage (at the rear).
* Power Push Button Lettering Worn.
* No internal metal case = not sure if they provided metal cases when wood cases were provided?
* Miss matched outputs on one channel.

 

[Super Noob]

Power Supply Board (P-800)
C801 - Original 470uF 63v / Now 1000uF 63v (UPW1J102MHD)
C802 - Original 330uF v / Now 680uF 63v (UPW1J681MHD6)
C803 - Original 470uF 16v / Now 470uF 16v (UPW1J102MHD)
C804 - Original 330uF v / Now 680uF 63v (UPW1J681MHD6)
C805 - Original 3.3uF 35v / Now 10uF 50v (UKT1H100MDD)
C806 - Original 10uF 50v / Now 22uF 50v (UKA1H220MDD)
C807 - Original 220uF 10v / Now 220uF 35v (UKA1V221MPD)
C810 - Original 47uF 16v / Now 47uF 35v (UK1V470MDD)

H801 – Original S1B-01-02 / Now UF4005
H802 – Original S1B-01-02 / Now UF4005
H803 – Original 2SD315 / Now MJE15032G (T-66 to TO-220)
H804 – Original BZ-140 / Now 1N4744A (OnSemi)
H806 – Original 2SC734 / Now Now KSC2383YTA
H807 – Original WZ-071 / Now N4737A (OnSemi)
H808 – Original SC945 / Now KSC2383YTA
H809 – Original 2SC1213A / Now KSC2383YTA
H810 – Original 2SC1213A / Now KSC2383YTA
H811 – Original S1B-01-02 / Now UF4005
H812 – Original S1B-01-02 / Now UF4005
H813 – Original S1B-01-02 / Now UF4005

L801 – Relay MY2 24V / Now MY2-DC24 (the relay I used was not the direct replacement - worked but get the correct one).

Before:

In Process - Glue:

After:

 

[Super Noob]

Left / Right Amp Boards (P-750) = QTY 2 Boards
C751 - Originally 1uF 100v / Now 1uF 100v (MKP4D041005D00JSSD)
C753 - Originally 1000pF 500v / Now 1000PF 100v (FG28X7R2A102KNT00)
C754 - Originally 500pF 500v / Now 470uF 100v (FG18C0G2A471JNT00
C759 - Originally 10uF 16v / Now 47uF 35v (UKL1V470KPDANA)
C760 - Originally 10uF 16v / Now 47uF 35v (UKL1V470KPDANA)
C761 - Originally 22uF 6.3v / Now 22uF 35v (UKL1E220KDDANA)

H751 - Originally 2SA650 / Now KSA992FBU (HFE Matched, Wakefield 120, Heatshrink to H752)
H753 – Originally 2SC945 / Now KSC2383YTA
H762 – Originally WZ-150 / 15v Zener Diode Now (BZX85B15-TR)
H763 – Originally WZ-150 / 15v Zener Diode Now (BZX85B15-TR)
H764 – Originally WZ-071 / 7.1v Zener Diode Now (1N4737A)
H765 – Originally WZ-071 / 7.1v Zener Diode Now (1N4737A)

Flyback Diode: 1N4004 J760 (cathode) to J761 (anode)
Flyback Diode: 1N4004 J753 (cathode) to J754 (anode)
*updated 2.12.22

H01 – PNP / Now MJ15025G
H02 – NPN / Now MJ15024G

 

[Super Noob]

Tone Amplifier Board (P400) & Tone Control (P450)
C401 - Originally .22uF 50v / Now .33uF 100v (MKS2D03301M00JO00)
C402 - Originally .22uF 50v / Now .33uF 100v (MKS2D03301M00JO00)
C403 - Originally 1uF 25v / Now 1.0uF 63v (MKS2C041001F00JC00)
C404 - Originally 1uF 25v / Now 1.0uF 63v (MKS2C041001F00JC00)
C405 - Originally 10uF 35v / Now 47uF 50v (UKL1H470KPD1TA)
C406 - Originally 10uF 35v / Now 47uF 50v (UKL1H470KPD1TA)
C407 – Originally 3.3uF 25v / Now 3.3uF 63v (MKS2C043301K00KSSD)
C408 – Originally 3.3uF 25v / Now 3.3uF 63v (MKS2C043301K00KSSD)
C409 – Originally 100uF 35v / Now 220uF 50v (EEU-FM1H221)
C410 – Originally 3.3uF 25v / Now 3.3uF 63v (MKS2C043301K00KSSD)
C411 – Originally 3.3uF 25v / Now 3.3uF 63v (MKS2C043301K00KSSD)
C414 - Originally 1uF 35v / Now 1.0uF 63v (MKS2C041001F00JC00)
C415 - Originally 1uF 35v / Now 1.0uF 63v (MKS2C041001F00JC00)
C451-C454 – Originally .022uf / Now .022uf 250v (MKP2F022201B00JI00)
C455-C456 – Originally .006uf / Now .0068uf 1000v (MKP20116801F00JO00)
C457-C458 – Originally .01uf / Now .01uf 100v (FG24C0G2A103JNT00)
C457-C458 – Originally .01uf / Now .01uf 100v (FG24C0G2A103JNT00)
C459-C460 – Originally 100pf / Now 100pf 100v (FG28C0G2A101JNT6)
C461-C62 – Originally .0022uf / Now .0022uf 250v (FG28C0G2A222JNT00)

H401 – Originally 2SC1000 / Now KSC1845FTA
H402 – Originally 2SC1000 / Now KSC1845FTA
H403 - Originally 2SA493 / Now KSA992FBU
H404 - Originally 2SA493 / Now KSA992FBU
H405 – Originally 2SC1000 / Now KSC1845FTA
H406 – Originally 2SC1000 / Now KSC1845FTA
H407 - Originally 2SA493 / Now KSA992FBU
H408 - Originally 2SA493 / Now KSA992FBU

The pots were desoldered, cleaned with DeOxit, then flushed with Faderlube.

 

[Super Noob]

Phono Amp (P700)
C701– Originally .47uF 50v / Now 1uF 50v (ECW-FD2W105J)
C702– Originally .47uF 50v / Now 1uF 50v (ECW-FD2W105J)
C703 - Originally 22uF 6.3v / Now 47uF 50v (UKL1H470KPD1TA)
C704 - Originally 22uF 6.3v / Now 47uF 50v (UKL1H470KPD1TA)
C713– Originally 100uF 50v / Now 220uF 50v (EEU-FM1H221)
C714– Originally .47uF 50v / Now 1uF 50v (ECW-FD2W105J)
C715– Originally .47uF 50v / Now 1uF 50v (ECW-FD2W105J)

H705 – Originally 2SC458L / Now KSC1845FTA
H706 – Originally 2SC458L / Now KSC1845FTA
H707 – Originally 1S1212 / Now 1N4148
H708 – Originally 1S1212 / Now 1N4148
H709 – Originally VD1212 / Now Dual 1N4148

Before:

 

[Super Noob]

FM IF Amplifier (P200)
C216– Originally 10uF 16v / Now 10uF 35v (UKT1V100MDD)
C218– Originally 10uF 16v / Now 10uF 35v (UKT1V100MDD)
C220– Originally 10uF 16v / Now 10uF 35v (UKT1V100MDD)
C222– Originally 10uF 16v / Now 10uF 35v (UKT1V100MDD)
C224– Originally 10uF 16v / Now 10uF 35v (UKT1V100MDD)
C226– Originally 10uF 16v / Now 10uF 35v (UKT1V100MDD)
C243– Originally 4.7uF 35v / Now 4.7uF 50v (UKT1H4R7MDD)
C244– Originally 4.7uF 35v / Now 4.7uF 50v (UKT1H4R7MDD)
C245– Originally 4.7uF 35v / Now 4.7uF 50v (UKT1H4R7MDD)

Just changed Caps... FM alignment is good and tuning works well.

 

[Super Noob]

AM Tuner (P150)
C161 – Originally 10uF 16v / Now 10uF 50v (UKT1H100MDD) 25v would suffice
C162 – Originally 10uF 16v / Now 10uF 50v (UKT1H100MDD) 25v would suffice
C164 – Originally 10uF 16v / Now 10uF 50v (UKT1H100MDD) 25v would suffice
C165 – Originally 10uF 16v / Now 10uF 50v (UKT1H100MDD) 25v would suffice
C166 – Originally 10uF 16v / Now 10uF 50v (UKT1H100MDD) 25v would suffice
C171 – Originally 10uF 16v / Now 10uF 50v (UKT1H100MDD) 25v would suffice
C173 – Originally 10uF 16v / Now 10uF 50v (UKT1H100MDD) 25v would suffice
C175 – Originally 10uF 16v / Now 10uF 50v (UKT1H100MDD) 25v would suffice
C178 – Originally 10uF 16v / Now 10uF 50v ((UKT1H100MDD) 25v would suffice
C180 – Originally 10uF 16v / Now 10uF 50v (UKT1H100MDD) 25v would suffice
C181 – Originally 10uF 16v / Now 10uF 50v (UKT1H100MDD) 25v would suffice
C183 – Originally 10uF 16v / Now 10uF 50v (UKT1H100MDD) 25v would suffice
C184 – Originally 100uF 10v / Now 100uF 25v (UKA1E101MED)

Sometimes the documentation process has gaps. I don't have good after picture of this board. You will see if on finished top pictures. These boards are tight and require that you loosen the wiring routing to get access. Again, the 2270 is a struggle to work on compared to the 2275.

 

[Super Noob]

MPX Stereo Amp (P300)
C301 – Originally 10uF 16v / Now 10uF 35v (UKL1V100KDDANA)
C302 – Originally 10uF 16v / Now 10uF 35v (UKL1V100KDDANA)
C306 – Originally 10uF 16v / Now 10uF 35v (UKL1V100KDDANA)
C311 – Originally 10uF 16v / Now 10uF 35v (UKL1V100KDDANA)
C312 – Originally 220uF 16v / Now 220uF 35v (EEU-FM1V221L)
C319 – Originally 10uF 35v / Now 10uF 50v (UKL1H100MDD)
C320 – Originally 10uF 35v / Now 10uF 50v (UKL1H100MDD)
C321 – Originally 10uF 16v / Now 10uF 35v (UKL1V100KDDANA)
C322 – Originally 10uF 16v / Now 10uF 35v (UKL1V100KDDANA)
C323 – Originally 100uF 10v / Now 100uF 25v (EEU-FM1V221L)
C324 – Originally .1uF 25v / Now .1uF 63v (MKS2-.1/63/5)
C331 – Originally 4.7uF 35v / Now 4.7uF 50v (UKL1H4R7KDDANA)
C332 – Originally 4.7uF 35v / Now 4.7uF 50v (UKL1H4R7KDDANA)
C333 – Originally 1uF 25v / Now 1uF 63v (MKS2C041001F00JA)
C334 – Originally 1uF 25v / Now 1uF 63v (MKS2C041001F00JA)
C335 – Originally 220uF 25v / Now 220uF 35v (EEU-FM1V221L)
C336 – Originally 33uF 10v / Now 33uF 25v (UKA1E330MDD)

 

[Super Noob]

FM Detector Assembly (P500)
C503 – Originally 10uF 16v / Now 10uF 35v (UKL1V100KDDANA)
C508 – Originally 10uF 16v / Now 10uF 35v (UKL1V100KDDANA)
C509 – Originally 100uF 10v / Now 100uF 25v (EEU-FM1E101)
C510 – Originally 1uF 25v / Now 1uF 63v (MKS2C041001F00JA)
C511 – Originally 10uF 16v / Now 10uF 35v (UKL1V100KDDANA)
C514 – Originally 100uF 16v / Now 100uF 25v (EEU-FM1E101)

 

[Super Noob]

Muting Control Amp (P550)
C554 – Originally 10uF 16v / Now 10uF 35v (UKL1V100KDDANA)
C559 – Originally 10uF 16v / Now 10uF 35v (UKL1V100KDDANA)
C013 – Originally 4.7uF 35v / Now 4.7uF 50v (UKT1H4R7MDD)

 

[Super Noob]

Main Filter Caps:
Originally 9000 uF 55v (85c) --> 12,000uF 80v (105c) Chemi-Con
(installed Panasonic Stack Film 2.2uf bypass caps)

 

[Super Noob]

Re-lamp = new LEDs custom indicator lamps made to fit. LED bulb flatten and scuffed. 3 SMD style fuse LEDs installed for FM tuning, Signal Strength, and FM dial.

New Dial Vellum:

 

[Super Noob]

Here is a summary of replacements:
(~)
77 Electrolytic Capacitors
12 Film Capacitors
8 Ceramic Capacitors
4 Tantalum Capacitors
5 Variable Resistors
25 Transistors
19 Diodes
3 Resistors
1 Relay
5 Micas
9 Indicator LEDs
7 Fuse Style LEDs

 

[Super Noob]

Wood Case Dive:

I stabilized the particle board by brush off loose pieces then I create a form and applied 2-part epoxy. I also applied painted film of 2 part epoxy (clear) to the bottom of the case. I then reshaped the epoxy with sand paper and cut in groove for vent grill. New piece of veneer was glued on in place. Not perfect but very acceptable in my eyes.

 

[Super Noob]

Finishing Up:
Offset adjusted fine to less than 1mV on each channel.
Bias was set to 5mV between TP 754 & 756.

 

[Super Noob]

Final Pics:

Hope this build helps someone in the future. Sound likes another quality 70s units - been listen to for last month or so.

(you can see in the next picture I went ahead and cleaned off the power button lettering - it was the only lettering compromised)

 

[tonebells]

Tony

 

[Dingman]

Nice work there. Thanks for sharing.

 

[rustyhusky]

A very timely post. A 2270 just followed me home from my cousins place. Won't come up using dim bulb tester (lamp flickers on and off). Planning on doing a similar rebuild and see what happens. Thanks!

 

[slowpat]

Great rebuild thread. Are you saying restoring your 2275 was easier than the 2270?