Photo of one unit in ad, lights on; sold another unit not pictured in ad?
If this goes deeper than F604, I recommend either 1) an experienced tech or 2) if you're doing this yourself, make or otherwise obtain a DBT.
I am in the same boat. I seem to have narrowed to the volume pot, or at least near it. I took a pause on it to let my frustration dissipate (I accidentally broke one of the tower coils on the MPX board while I was messing around with the volume difference). I'll get back to it eventually...
What are you using for a source? I'd been driving myself nuts trying to figure out why I had semirhythmic sound coming out of my 2000 when I finally realized that by moving the cell phone I was using for an AUX source, the noise could be changed. It had been the phone to RCA plug interface...
The 5000(X/A) is a beast and totally worth it, IMO, but I'm fairly confident in my soldering abilities. I agree with Sansuiman that you need to do the mod, you'll just have to dig up some buried forum treasure to do so.
I've had both the 4000 and 5000a, and it was worth it. My 4000 had a blown left channel the seller concealed by using the MONO button and wiring one speaker to channel A and another to channel C. To this day I don't know if he was fooling himself or trying to fool me, but it was $45 so I bought...
There was a reason I didn't go with 22. I can't recall at this moment whether it was because it wasn't available at the time or if there was a fit issue.
I went with 4+4 instead of 8.2 at the time because I was quite paranoid at the time about getting exact values and I just never re-adjusted...
The AudioCap Thetas are being used as a bypass across the main caps. I included them in my SP2000 refurbs per rek50's recommendation, but some would argue whether they were necessary or just adding extra expense and complexity. I would call them "optional" (but I've always put them in)...
larryderouin is correct in all particulars... the 2SC458s are used for gain with low-noise, but unfortunately that transistor type did not age well-- even within 5-10 years they needed replacement, apparently, according to folks who were service techs in the 70s and 80s, because they became...
Yeah, not a fan of the filter board soldering design decision. Was my least favorite thing about opening this unit. I might be opening it back up up to add better power supply caps at some point, but I have two 2000s and a 5000x to nurse back to health first
Okay, you made me think there was something I didn't know about beyond the Sansui 7000 with your crazy "8000" typing. :)
It makes way more sense that it was an Eight. And beautiful. Very jealous!