Sansui AU-20000

Got this from a friend to go over and make sure everything is good on it, utterly beautiful amp, this has to be one of the nicest looking integrated amps I have ever seen. I'll let the pics do the talking.

Pioneer SPEC-1 recap and restoration! (New photos!)

Here is the SPEC-1 that goes with the SPEC-4 in the other post I have, full recap and restore is being done to this one as well.

Some before photos of the boards, more will be added as I get to the various boards:

Tone amp

Input (phono amp)

Filter amp

I forgot to get a before shot of the mixing amp board, bad me!

Power supply

Fuse board

And after recap!

Tone amp

Input (phono amp)

Filter amp

Mixing amp

Power supply board

Fuse board

And here are the both of them completed!

Pioneer SPEC-4 recap and repair! (New photos!)

I got a SPEC-4 to repair and recap from a guy in North Carolina, it had quit working with crackle pop and some magic smoke. Upon receiving it and checking it out, I found almost every transistor on the right amp board was either shorted, open or both! Four resistors had also fried, two of them had melted.

Some before photos, I will add to these soon.

Right amp board, you can see the burned out resistors from browned heat wraps over them.

Left amp board

Meter amp board

And some after photos!

Left amp board

 Right amp board

Meter amp board

I had to customize the boards a little to fit the new relay in, the old relay is a small MY2 style relay that is no longer obtainable, so I had to get a regular MY2 relay which is larger and fit it in. The photos below are of the right amp board.

I first checked the fit and drilled some new holes using a 1/16" bit, I was a little off on the last two on the far right, they should have been even with the others

Soldering it in, I scraped some the green coating off of the trace around where the new holes were so the solder would stick and soldered it in. The output wire that goes to the speaker terminal needs to be moved from pin 12 to pin 13, also needed are two jumpers, one, the green wire, jumps the 48VDC for the relay over to the new relay position and two, the bare wire jumper connects pin 13 to pin 12 so the meter drive circuit (pin 10) works, as pin 10 is directly connected to pin 12 but not pin 13.

And it's all together again!

Filter caps before

Filter caps after

And here are the both of them completed!

Pioneer SX-1980 Recap and Restoration!

I have finally got one, the beast. A friend of mine got a line on this one, scratchy controls was all it had. He asked my opinion of it and should he get it, you can imagine what my response was. GET IT! He bought it, but found it could not fit anywhere in his system, so he offered it to me, and long story short I got it and he shipped it here. If you have never seen one of these in person, you can't appreciate how big these things are. They, are, massive! And try moving one around a lot, it will cause you to have a hernia, 78 pounds, 22 1/4" wide, 19" deep and 8 1/4" high.

I'm going to be doing a complete restore to it, recap, full cleaning from top to bottom, the works. Here are some before photos, I'll be adding more as I get into it.

Some before photos of the boards, more will be added as I get to them

EQ (Phono) amp board

Tone amp board

Flat amp board

Filter amp board

Power amp board (there are two of them and they look exactly the same, except one has the two big caps on the left instead of the right, this one is of the left amp board)

Power supply board

And after recap!

EQ (Phono) amp

Tone amp

Flat amp

Filter amp

Power amp (this one is the right hand amp board)

Power supply board (Note: I miscounted the caps in the list I created and came up two short, so you can see two caps that are still original, I've got those on order.)

And it works perfectly! Powered up on the DBT (Dim Bulb Tester) with no problems, offset and bias set with no problems whatsoever and when I played it for the first time, glorious sound from both channels, no scratchiness or cutting out at all.

I still have to replace the two caps on the power supply I missed, the SS relay, the two 35v zener diodes and the tuner boards, but other then that this thing is ready to rock and roll! I'll be posting pics soon with it back together.

Update 08/11/12: I replaced the 35v zeners, the two caps and the soft start relay a month ago but some how forgot to update the post to that affect! The regulator mod discussed here was also implemented

New relay top and side, note it is a top mount, so I will have to exchange cases with the old relay so it will fit on the board.

New vs old

And the new relay in place!

Also got the tuner recapped and fully aligned!

Tuner board before:

And after!

This is the APC board which controls the quartz lock

Before:

And after!

 And here are some photos of it with everything put together!