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Sansui 5000

Guido57 said:
Then you need to simplest unit you can find so you have the most direct way to what you need. While I am somewhat competent in the digital world I do miss some parts of the analog world I grew up in.
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so do I, knobs and switches with simple indication my old Simpson meter LOL
 
Note regarding my post #156: this is in reference to the no sound issue I think you mentioned. Your bias issues are likely a separate problem, probably on the 6013 board itself.
Question: did you do anything with/to the protection bulb? Its presence is critical.
 
Guido57 said:
Note regarding my post #156: this is in reference to the no sound issue I think you mentioned. Your bias issues are likely a separate problem, probably on the 6013 board itself.
Question: did you do anything with/to the protection bulb? Its presence is critical.
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I have been keeping the dbm in line at all times...
 
Are you referring to TR808-810? The 5000A diagram lists two each of TR807 and TR808. The nomenclature is repeated for the right and left channels. In the 5000X manual there is no repeat of 807-808, TR807 and 809 are the left channel, TR808 and 810 are the right channel.

I am not referring to the DBT. I am referring to PL001, the lamp in the protection circuit. It is needed to provide power to the tone board.
 
Yes, or no power to one side of the tone board! Bad juju.
On the one currently on my bench the wire is orange from PL001, yellow to the tone board. The orange has bit of a brownish tinge to it, there are brown wires in the area that kind of milk chocolate brown. Don't mix up the two, I can do a picture tomorrow.
Could one run a wire directly from PL001 to the tone board? Probably but I'd advise against being too adventurous.
I discovered the significance of PL001 when I installed a replacement bulb that didn't make proper contact. Pain in the arse it was.
 
As I said my scope is a little old LOL but still tube operated

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hmmmm the signal on the scope I get at the orca input goes all the way through to the line in on the driver boards....IMG_3718.JPG
 
Can't tell much by the picture but it appears you've got the probe attached to the input switch, if so the signal isn't going through any circuitry. Can't see where the probe's ground is attached.
For just tracing a signal that scope is as good as any.
 
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IMG_20250320_091644327.jpgThose two blue wires, one with gray sheathing, on the 1051 (filter) board are the last point to measure the signal before the driver boards. Those would be the first points I would check to see if the driver boards are getting a signal.
 
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If I am seeing the same signal at the first point of input and at the driver board would that be testing the whole circuit?
I will definitely check that point once I get home. I wasn’t sure if that was the last point before the drivers….

if I remember and understand right I am looking for the signal that is introduced at the input is repeated all the way through the wiring and circuit boards to the driver board, correct?
 
Wherever in the signal path your results differ from the input there is a problem before that point. It's simple as that.
Note: The tape inputs, A and B, do not go through the equalizer board. Moving the signal input to the tape monitor is an easy way to get the equalizer board out of the path. Also if your input is Phono you will be putting the signal though the RIAA equalization curve.
Those wires I pointed out run directly to the driver boards. The shield is grounded at the driver board but not at the 1051 board.
If you have issues at those wire then go to the inputs of the tone board.
 
Guido57 said:
Wherever in the signal path your results differ from the input there is a problem before that point. It's simple as that.
Note: The tape inputs, A and B, do not go through the equalizer board. Moving the signal input to the tape monitor is an easy way to get the equalizer board out of the path. Also if your input is Phono you will be putting the signal though the RIAA equalization curve.
Those wires I pointed out run directly to the driver boards. The shield is grounded at the driver board but not at the 1051 board.
If you have issues at those wire then go to the inputs of the tone board.
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I want thank you so much for this… you have been so much help
 
Ok I am narrowing this down, on the input selector I see the 2 rearmost contact discs handle the left and right from the auxiliary input but I cannot find any clean sine waves exiting those contact discs on the frontmost I can see an overlapped sine wave...I would think I should be able to pick up a clean sine wave somewhere off of the selector switch
 
I found the selector switch to be a total PITA to get a reading off of. Is that where you are starting? Is the signal you get at the switch the same as at the boards? The farthest back in the signal path I've needed to go was the equalizer board.
 
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