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Sansui 661 Recap/Parts List Thread

Penn42

Penn42

Well-Known Member
I've got a 661 I'm going to be breathing some life into. After having successfully restored a 535 and 737 (thanks to help from everyone over in the Pioneer forum) my next project is going to be this 661. There isn't anything wrong with it, but all parts are original and the noise floor is pretty high. Part of which I'm assuming can be attributed to the original 2sa726's in the driver board that I've learned are quite problematic.

Currently I have gone through and cross referenced everything in the unit against the information in the service manual and marked down incongruities accordingly. I'll be ordering caps that match what was in the unit, not what was in the SM. Thanks to the giant Sansui transistor thread I have gotten quite a few of the transistor replacements figured out as well, but not all of them. I'm not sure which, if any, transistors I should leave alone. Wasn't going to touch the outputs, but what about the two metal can round ones on the driver board (2sc281) are there suitable replacements or do I even need to replace? Any other anomalies I should leave alone?

And there doesn't seem to be as much info out there for diode replacements either. It seems to be pretty common practice on the Pioneer receivers to replace diodes on the power board, but I haven't found much info as to what would be good replacements for the ones in the 661. Are the power board diodes something I don't need to worry about with this Sansui?

Lastly, what caps would you recommend for use as the filter caps? I was going to use Nichicon KG series, but I haven't ever worked with Snap in Caps before and that's all the KG series has it looks like.

Here's my current, incomplete, BOM. Red text are Parts I haven't found suitable replacements for yet. Otherwise the part #'s and capacitors values are for what is in the unit followed by Mouser's replacement #.

Pre Amp
F-1501 TR01 2sc1313 512-KSC1845FTA
F-1501 TR02 2sc1313 512-KSC1845FTA
F-1501 TR03 2sc1313 512-KSC1845FTA
F-1501 TR04 2sc1313 512-KSC1845FTA
F-1501 TR05 2sc1313 512-KSC1845FTA
F-1501 TR06 2sc1313 512-KSC1845FTA
F-1501 C01 1.5uF 25V 647-UKL1H1R5KDDANA
F-1501 C02 1.5uF 25V 647-UKL1H1R5KDDANA
F-1501 C09 100uF 6.3V 647-UPW1A101MDD1TD
F-1501 C10 100uF 6.3V 647-UPW1A101MDD1TD
F-1501 C15 .47uF 50V 647-UKL1HR47KDDANA
F-1501 C16 .47uF 50V 647-UKL1HR47KDDANA
F-1501 C25 .47uF 50V 647-UKL1HR47KDDANA
F-1501 C26 .47uF 50V 647-UKL1HR47KDDANA
F-1501 C601 100uF 50V 647-UPW1H101MPD
F-1501 C602 100uF 50V 647-UPW1H101MPD

Driver
F-1499A TR01 2sa726 512-KSA992FBU
F-1499A TR02 2sa726 512-KSA992FBU
F-1499A TR03 2sa726 512-KSA992FBU
F-1499A TR04 2sa726 512-KSA992FBU
F-1499A TR05 2sc1124 512-KSC3503DSTU
F-1499A TR06 2sc1124 512-KSC3503DSTU
F-1499A TR07 2sc281
F-1499A TR08 2sc281
F-1499A TR09 2sc1124 512-KSC3503DSTU
F-1499A TR10 2sc1124 512-KSC3503DSTU
F-1499A TR11 2sa706 512-KSA1381ESTU
F-1499A TR12 2sa706 512-KSA1381ESTU
F-1499A C01 .47uF 50V 647-UKL1HR47KDDANA
F-1499A C02 .47uF 50V 647-UKL1HR47KDDANA
F-1499A C05 220uF 10V 647-UPW1A221MED
F-1499A C06 220uF 10V 647-UPW1A221MED
F-1499A C09 33uF 50V 647-UPW1H330MED
F-1499A C10 33uF 50V 647-UPW1H330MED
F-1499A C13 100uF 50V 647-UPW1H101MPD
F-1499A C14 100uF 50V 647-UPW1H101MPD

Power
F-1500A TR01 2sc1030
F-1500A TR02 2sc1030
F-1500A TR03 2sc1030
F-1500A TR04 2sc1030
F-1500A TR05 2sc875
F-1500A TR06 2sd330
F-1500A TR07 2sc1364 512-KSC2690AYS
F-1500A TR08 2sc1364 512-KSC2690AYS
F-1500A D01 10DC-1
F-1500A D02 10DC-1
F-1500A D03 10DC-1(r)
F-1500A D04 10DC-1(r)
F-1500A D05 10D-1 821-1N5392
F-1500A D06 10D-1 821-1N5392
F-1500A D07 10D-1 821-1N5392
F-1500A D08 10D-1 821-1N5392
F-1500A D09 1N34A
F-1500A D10 1N34A
F-1500A D11 1N34A
F-1500A D12 1N34A
F-1500A ZD01 RD13E(B)
F-1500A ZD02 RD24A-N
F-1500A C02 1000uF 35V 647-UPW1V102MHD
F-1500A C03 47uF 50V 647-UPW1H470MED
F-1500A C04 47uF 50V 647-UPW1H470MED
F-1500A C05 100uF 25V 647-UPW1E101MED
F-1500A C06 100uF 16V 647-UPW1E101MED
F-1500A C06 33uF 50V 647-UPW1H330MED
F-1500A C08 220uF 6.3V 647-UPW0J221MED
F-1500A C09 1uF 50V 647-UKL1H010KDDANA
F-1500A C10 1uF 50V 647-UKL1H010KDDANA
F-1500A C11 47uF 10V 647-UPW1A470MDD
F-1500A C16 3300uF 35V
F-1500A C17 3300uF 35V
F-1500A C21 1uF 50V 647-UKL1H010KDDANA
F-1500A C22 1uF 50V 647-UKL1H010KDDANA
 
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I would suggest to change the ecaps first, unless it is a PITA to take apart and put back together again. See what that does then if no improvement in the noise, then progress with the bjt replacements.
Looks like you have done a decent job of using Nich UKL and UPW where needed. I have noit gone over everything.
To make the best use of snap in ecaps, it is best to use a pcb. the leads are short so difficult to solder wire to them.
 
rcs16 said:
I would suggest to change the ecaps first, unless it is a PITA to take apart and put back together again. See what that does then if no improvement in the noise, then progress with the bjt replacements.
Looks like you have done a decent job of using Nich UKL and UPW where needed. I have noit gone over everything.
To make the best use of snap in ecaps, it is best to use a pcb. the leads are short so difficult to solder wire to them.
Click to expand...

Thanks for giving it a quick look. When you say best to use a pcb for the snap-ins, do you mean mount them to a separate smaller circuit board than the board they're already on and then attach that board to the power supply pcb. In this unit the filters are radial caps mounted on with the through hole style.
 
Okay I am not sure of the dimensions of the original ecaps, if they are pcb mount then match the pin spacings. snap in ecaps sometimes have multiple pins, some are just for mechanical strength and have no electrical function.
 
Ok thanks, to make sure I'm understanding correctly: if I get snap ins with equal pin spacing them I'll be able to put its little nub into the pcb and solder as normal? Snap ins are just like short stubby leads?
 
Penn42 said:
F-1500A D09 1N34A
F-1500A D10 1N34A
F-1500A D11 1N34A
F-1500A D12 1N34A
Click to expand...
Germanium diodes.. I have no clue where to get vetted legit replacements . Lots of them on ebay from china. Buyer beware.
 
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Penn42 said:
In the unit these diodes (marked as the 10DC-1's in the SM) seemed to be marked I(1?)R4B. Are those any different?

Thanks for all the knowledge!
Click to expand...
Yes they are different .dual diodes one is common anode and the other is common cathode Just use two 1N4007's in the correct orientation .
 
avionic said:
Yes they are different .dual diodes one is common anode and the other is common cathode Just use two 1N4007's in the correct orientation .
Click to expand...

To get it through my dummy brain. A total of 8 diodes, two leads per hole?
 
Penn42 said:
F-1499A TR07 2sc281
F-1499A TR08 2sc281
Click to expand...
Might be able to find legit ones on ebay TO-1 case style The emitter,base and collector are isolated from the metal case. If there not bad I wouldn't mess with them.These are for bias thermal tracking.
 
Penn42 said:
To get it through my dummy brain. A total of 8 diodes, two leads per hole?
Click to expand...
One 10DC1/10DC1R has three leads anode-cathode-anode or cathode-anode-cathode. Each 10DC1/10DC1R is replaced with two 1N4007's . The center pin will have two leads in the same hole either common anode or common cathode. So yes you will require 8 each 1N4007.
 
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Just have to pay close attention to the polarity of the diodes.
 
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