Just a few follow-up questions on SX-5580/SX-1050 refresh.

Blue Shadow

Waiting for Vintage Gear from this century
The parts list I have seem to have replace if bad along with must replace components. I'm curious as to which are the must replace items. The unit was working before I got into it.
Here is the transistor list:

2SA628A
2SA720
2SA725-yes, this is always replaced when found
2SA750
2SA841S
2SA858
2SA872A
2SB507
2SB536a
2SC1312
2SC1313
2SC1318
2SC1384-yes, this one is overworked on the protection board
2SC1439
2SC1775A
2SC869
2SC945
2SD313-yes, this one on the power supply-a board needs a break
2SD381a
2SD325

Here are the power supply diodes and resistors, should these be changed? Older recommended replacement listed after the component.
awr-103 d1 wz-140 512-1N5244B
awr-103 d2 wz-130 512-1N5243B
awr-103 d3 wz-061 512-1N5234B
awr-103 d4 wz-061 512-1N5234B
awr-103 r1 10 ohms 1 w 71-CPF110R000FKE14
awr-103 r19 10 ohms 2 w 594-5083NW10R00J
awr-103 r20 10 ohms 1/2 w 66-RG1/210JTR
awr-103 r21 10 ohms 2 w 594-5083NW10R00J

The protection diode: awm-090 d5 eqa01-33r 512-1N5257B

To do this right do both relays get swapped?
 
I would think changing ecaps would be more important than semi's to start with. Also clean the switches first, check offset and bias. To each there own.
 
All the ecaps have been replaced. I guess I forgot to say that. Since I'm finishing up this unit, just curious about the parts above. Searched and not many came up as 'these gotta go' items.
 
Depends upon if you are pursuing disaster aversion, reliability improvements, overall longevity, sound improvements or semi-overboard or fully overboard re-manufacturing as to what is "gotta go".

One thing that is minimally invaded is the tuner Front End, RF and IF sections. The audio sections and e-caps ARE upgraded, but the RF and IF sections are NOT changed, as we may not be able to bring it back operating with different parts - tuners are touchy that way. That is PART of the AWE-067 tuner board.

It's hard to vet your list with just raw transistor numbers, I need board numbers and transistor locations ( Q1.. etc )
 
I'm looking to make a nice unit somewhere between reliability improvements and overall longevity. I believe the full recap and the regreasing the of the power transistors is sort of semi-overboard as it stands. Only a few transistors have been changed, that 1384 for a 2690 and a

Here is that information
power supply-a
awr-103 q1 2sd313 0 0 0 0 0 512-ksc2073TU
awr-103 q2 2sc869 0 0 0 0 0 512-KSC2383YTA
awr-103 q3 2sc869 0 0 0 0 0 512-KSC1845FTA
awr-103 q4 2sc1318 0 0 0 0 0 512-KSC2690AYS
awr-103 q5 2sb507 0 0 0 0 0 512-KSA940TU
awr-103 q6 2sa628 0 0 0 0 0 512-KSA1013YBU
awr-103 q7 2sa628 0 0 0 0 0 512-KSA992FBU
awr-103 q8 2sa720 0 0 0 0 0 512-KSA1220AYS
awr-103 q9 2sd325 0 0 0 0 0 512-ksc2073TU
awr-103 q10 2sc945 0 0 0 0 0 512-KSC2383YTA
awr-103 q11 2sc945 0 0 0 0 0 512-KSC1845FTA
awr-103 q12 2sd325 0 0 0 0 0 512-ksc2073TU
awr-103 q13 2sc945 0 0 0 0 0 512-KSC2383YTA
awr-103 d1 wz-140 0 0 0 0 0 512-1N5244B
awr-103 d2 wz-130 0 0 0 0 0 512-1N5243B
awr-103 d3 wz-061 0 0 0 0 0 512-1N5234B
awr-103 d4 wz-061 0 0 0 0 0 512-1N5234B
awr-103 r1 10 ohms 1 w 0 0 0 0 71-CPF110R000FKE14
awr-103 r19 10 ohms 2 w 0 0 0 0 594-5083NW10R00J
awr-103 r20 10 ohms 1/2 w 0 0 0 0 66-RG1/210JTR
awr-103 r21 10 ohms 2 w 0 0 0 0 594-5083NW10R00J
protection
awm-090 q1 2sc869 0 0 0 0 0 512-KSC1845FTA
awm-090 q2 2sc869 0 0 0 0 0 512-KSC1845FTA
awm-090 q6 2sc945 0 0 0 0 0 512-KSD1616AGBU
awm-090 q7 2sc1384 0 0 0 0 0 512-KSC2690AYS I did this one
awm-090 d5 eqa01-33r 0 0 0 0 0 512-1N5257B
power amp
awh-047 q1 2sa750 0 0 0 0 0 512-KSA992FBU
awh-047 q2 2sa750 0 0 0 0 0 512-KSA992FBU
awh-047 q3 2sa750 0 0 0 0 0 512-KSA992FBU
awh-047 q4 2sa750 0 0 0 0 0 512-KSA992FBU
awh-047 q5 2sa750 0 0 0 0 0 512-KSA992FBU
awh-047 q6 2sa750 0 0 0 0 0 512-KSA992FBU
awh-047 q7 2sc1439 0 0 0 0 0 512-KSC3503dstu
awh-047 q8 2sc1439 0 0 0 0 0 512-KSC3503dstu
awh-047 q9 2sc1439 0 0 0 0 0 512-KSC3503dstu
awh-047 q10 2sc1439 0 0 0 0 0 512-KSC3503dstu
awh-047 q11 2sa858 0 0 0 0 0 512-KSA1381ESTU
awh-047 q12 2sa858 0 0 0 0 0 512-KSA1381ESTU
awh-047 q13 2sa858 0 0 0 0 0 512-KSA1381ESTU
awh-047 q14 2sa858 0 0 0 0 0 512-KSA1381ESTU
awh-047 q15 2sc1439 0 0 0 0 0 512-KSC3503dstu
awh-047 q16 2sc1439 0 0 0 0 0 512-KSC3503dstu
awh-047 q17 2sb536a 0 0 0 0 0 512-KSA940TU
awh-047 q18 2sb536a 0 0 0 0 0 512-KSA940TU
awh-047 q19 2sd381a 0 0 0 0 0 512-KSC2073TU
awh-047 q20 2sd381a 0 0 0 0 0 512-KSC2073TU
awh-047 q21 2sa858 0 0 0 0 0 512-KSA1381ESTU
awh-047 q22 2sa858 0 0 0 0 0 512-KSA1381ESTU
awh-047 q23 2sb539c 0 0 0 0 0 863-MJ21193G amp works no need to replace
awh-047 q24 2sb539c 0 0 0 0 0 863-MJ21193G "
awh-047 q25 2sd287c 0 0 0 0 0 863-MJ21194G "
awh-047 q26 2sd287c 0 0 0 0 0 863-MJ21194G "
awh-047 q27 2sb539c 0 0 0 0 0 863-MJ21193G "
awh-047 q28 2sb539c 0 0 0 0 0 863-MJ21193G "
awh-047 q29 2sd287c 0 0 0 0 0 863-MJ21194G "
awh-047 q30 2sd287c 0 0 0 0 0 863-MJ21194G "
filter amp
awm-089 q1 2sc1313 0 0 0 0 0 512-KSC1845FTA
awm-089 q2 2sc1313 0 0 0 0 0 512-KSC1845FTA
control amp
awg-041 q1 2sa725 0 0 0 0 0 512-KSA992FBU I did this one
awg-041 q2 2sa725 0 0 0 0 0 512-KSA992FBU I did this one
awg-041 q3 2sc1312 0 0 0 0 0 512-KSC1845FTA I did 4 of the 1312s which is all my board had. It didn't have a lot of these transistors.
awg-041 q4 2sc1312 0 0 0 0 0 512-KSC1845FTA
awg-041 q5 2sc1312 0 0 0 0 0 512-KSC1845FTA
awg-041 q6 2sc1312 0 0 0 0 0 512-KSC1845FTA
awg-041 q7 2sc1312 0 0 0 0 0 512-KSC1845FTA
awg-041 q8 2sc1312 0 0 0 0 0 512-KSC1845FTA
flat amp
awg-040 q1 2sc1775a 0 0 0 0 0 512-KSC1845FTA
awg-040 q2 2sc1775a 0 0 0 0 0 512-KSC1845FTA
awg-040 q3 2sa872a 0 0 0 0 0 512-KSA992FBU
awg-040 q4 2sa872a 0 0 0 0 0 512-KSA992FBU
awg-040 q5 2sk30aw 0 0 0 0 0 n/a
awg-040 q6 2sk30aw 0 0 0 0 0 n/a
awg-040 q7 2sa725 0 0 0 0 0 512-KSA992FBU I did this one
awg-040 q8 2sa725 0 0 0 0 0 512-KSA992FBU I did this one
equalizer amp
awf-020 q1 2sa841s 0 0 0 0 0 512-KSA992FBU
awf-020 q2 2sa841s 0 0 0 0 0 512-KSA992FBU
awf-020 q3 2sa841s 0 0 0 0 0 512-KSA992FBU
awf-020 q4 2sa841s 0 0 0 0 0 512-KSA992FBU
awf-020 q5 2sc1775a 0 0 0 0 0 512-KSC1845FTA
awf-020 q6 2sc1775a 0 0 0 0 0 512-KSC1845FTA
awf-020 q7 2sc1775a 0 0 0 0 0 512-KSC1845FTA
awf-020 q8 2sc1775a 0 0 0 0 0 512-KSC1845FTA
awf-020 q9 2sc872a 0 0 0 0 0 512-KSA992FBU
awf-020 q10 2sc872a 0 0 0 0 0 512-KSA992FBU

and you mentioned the tuner which I have not recapped, yet I have caps ready, essentially this list,
tuner
awe-067 c35 100 16 cea x 100 35 647-UPW1V101MPD
awe-067 c36 1 50 cea x 1 100 647-UPW2A010MDD
awe-067 c38 10 16 ceanl x 10 50 647-UKL1H100KDDANA
awe-067 c39 47 16 ceanl x 47 25 647-UKL1E470KEDANA
awe-067 c40 100 16 cea x 100 35 647-UPW1V101MPD
awe-067 c42 4.7 25 ceanl x 4.7 25 647-UKL1E4R7KDDANA
awe-067 c43 10 16 ceanl x 10 50 647-UKL1H100KDDANA
awe-067 c44 10 16 ceanl x 10 50 647-UKL1H100KDDANA
awe-067 c47 1 25 ceanl x 1 50 647-UKL1H010KDDANAtd
awe-067 c50 0.22 25 cssa x 0.22 50 598-DSF050J224
awe-067 c51 1 10 cssa x 1 50 647-UKL1H010KDDANAtd
awe-067 c52 3.3 10 cssa x 3.3 50 647-UKL1H3R3KDDANA
awe-067 c54 220 16 cea x 220 25 647-UPW1E221MPD
awe-067 c59 47 16 cea x 47 35 647-UPW1V470MED
awe-067 c60 4.7 25 cea x 4.7 50 647-UPW1H4R7MDD
awe-067 c64 10 16 cea x 10 50 647-UPW1H100MDD
awe-067 c67 0.1 25 cssa x 0.1 50 598-DSF100J104
awe-067 c70 1 25 ceanl x 1 50 647-UKL1H010KDDANAtd
awe-067 c71 0.1 25 cssa x 0.1 50 598-DSF100J104
awe-067 c72 0.47 50 cea x 0.47 50 598-DSF050J474
awe-067 q5 2sc1312 0 0 0 0 0 512-KSC1845FTA


Is it ok to recap the tuner and leave the rest or are you saying skip the tuner? Thanks for all your help.
 
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On top of the must replace already on that list, I always replace all 2SA750 (2SA/KSA1015), and 2SC869 in the protection circuit (KSA1845) and power supply(2SC/KSC2383Y). That applies to all Pioneer SX-(x)x50 series receivers.
All else I leave alone unless proven faulty.
It's OK to recap the tuner in that series of receiver.
 
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Yes, OK to recap tuner - we get some people that TRY to (or at least talk about it) replace the TUNER RF and IF silicon components.
 
Sadly, there aren't a lot of people around these days who have the knowledge base to mess with those items, Mark.
The deepest I have dared to go is to replace a 3SK45 in a front end (lucky guess), or replace some trimmer caps that just wouldn't get right. The math is intricate to say the least.
 
RE Tuners:
The parts are just not there in the "old format". Look at a tuner nowadays, you'll come up with a little silver box, with an antenna connection, a bunch of power and digital inputs, and a digital stream output, or if you are lucky - something marked L and R. Look inside if you dare (or if it's junk) and the level of integration and the lifespan of availability of the chips that drive it make it a throwaway and replace.

I find myself more and more considering buying film capacitors by the thousands, and I have regrets on not buying more of certain transistors in the thousands before they became permanently unavailable. But that doesn't help the new guy bitten by the bug to save silver.

It's getting harder and harder and there are fewer and fewer types of high gain and high voltage audio preamplifier transistors, like can be found in the input sections of a power amp.
 
On top of the must replace already on that list, I always replace all 2SA750 (2SA/KSA1015), and 2SC869 in the protection circuit (KSA1845) and power supply(2SC/KSC2383Y). That applies to all Pioneer SX-(x)x50 series receivers.
All else I leave alone unless proven faulty.
It's OK to recap the tuner in that series of receiver.


From the list I have
6 750s on the amp board
2 869s in the protection
2 869 in the power supply
that need to be swapped. I'll take care of that.

A question though is the 2 869s on the power supply board, q2 and q3. In my list q2 is replaced with a 2383 and q3 is replaced with an 1845. Should this stay, a proper evaluation by MTF or should q2 be replaced by a 2383? Since I'm learning all the time, I'm going to look at the datasheets for these three, 869/1845/2383 and see what the differences are.
 
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Well I have my final list of parts to complete this one. thanks for looking over my shoulder.

Part VCBO VEBO Ic mW Tj DChFE VCE

2SC869 160 5 30mA 200 125 90 6

KSC1845 120 5 50mA 500 150 150 0.3Max

KSC2383 160 6 1000 900 150 160 1.5max

Some are specs, some are typicals so not a complete comparison. The 869 info is from the list of 2sc8xx trannies in a thread with Avionic looking for info since a datasheet seems hard to find. Just posted because we talked about them and others might find it helpful somewhere down the line.
 
From the list I have
6 750s on the amp board
2 869s in the protection
2 869 in the power supply
that need to be swapped. I'll take care of that.

A question though is the 2 869s on the power supply board, q2 and q3. In my list q2 is replaced with a 2383 and q3 is replaced with an 1845. Should this stay, a proper evaluation by MTF or should q2 be replaced by a 2383? Since I'm learning all the time, I'm going to look at the datasheets for these three, 869/1845/2383 and see what the differences are.

Q2 position is a darlington drive element, and thus higher collector current could happen,
Q3 position is a feedback element and gain is better than drive in this location.
 
I've done it both ways without trouble, but it probably regulates a little tighter with a higher gain device as the error amp.
 
I was thinking about averting carnage upon high current demand conditions, putting in the higher current darlington driver half.
 
No, no, I don't ever use 1845 for the darlington driver. Just the error amp.
 
On top of the must replace already on that list, I always replace all 2SA750 (2SA/KSA1015), and 2SC869 in the protection circuit (KSA1845) and power supply(2SC/KSC2383Y). That applies to all Pioneer SX-(x)x50 series receivers.
All else I leave alone unless proven faulty.
It's OK to recap the tuner in that series of receiver.

Hello tarior, when you replace the 2SA750's on a SX-1050 do you gain match those?
 
It isn't necessary to gain match them, IMO, if they have the same lot # on them.
 
It isn't necessary to gain match them, IMO, if they have the same lot # on them.
Good to know. I've been reading about gain matching and on the parts list(s) it recommends the input transistors be matched on the Power Amp. Since its nearly impossible to truly match them (without a lot of gear) I was wasn't sure if I should replace them. Seems to me that tech is better today than when the machine was built, so putting in newer should be an improvement? I'm updating a 1050 and looking to improve the reliability and sound, not necessarily do a complete restoration. I've done the power/protection section(s) and was getting the to Power Amp and wondering how far to go on it. While I'm there, its not much trouble to replace the other transistors/diodes. Anything to consider in doing that? Also, I saw where matching Q1-Q4 on the EQ Amp was recommended, are those ok to replace as well (un-matched)? Thanks so much for your advice.
 
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