Ampeg B15R

[bsco]

Hello there....Question.....Looking at the schematic I see that there is no bias adj for this one....so I guess as long as my new output tubes are matched I should be good to go.....once I find out why the amp runs hot when in the 100W mode......Pulled the board out and everything looks good so far...don't see any bad joints there...no charred or overheated components........will check some associated components either later tonight or tomorrow....have to go out now and get the shovel warmed up....
Cheers

[nevetslab]

Hello there....Question.....Looking at the schematic I see that there is no bias adj for this one....so I guess as long as my new output tubes are matched I should be good to go.....once I find out why the amp runs hot when in the 100W mode......Pulled the board out and everything looks good so far...don't see any bad joints there...no charred or overheated components........will check some associated components either later tonight or tomorrow....have to go out now and get the shovel warmed up....
Cheers

The schematic I have (dwg # 07S267-01 Rev 4, 1997) shows two modes.....6L6GC with bias Voltage at -50VDC, and EL-34 with bias voltage at -40VDC. And, no trim adjustment.

[bsco]

The schematic I have (dwg # 07S267-01 Rev 4, 1997) shows two modes.....6L6GC with bias Voltage at -50VDC, and EL-34 with bias voltage at -40VDC. And, no trim adjustment.

Ok. This one has 6L6's.....but the bias voltages were not marked on the schematic.....I will have to double check later....I have to shovel some snow soon.......Thanks for that tidbit....
Cheers

[nevetslab]

Ok. This one has 6L6's.....but the bias voltages were not marked on the schematic.....I will have to double check later....I have to shovel some snow soon.......Thanks for that tidbit....
Cheers

Here's the Ampeg B15R file I have:

B-15R PCB Schematics (26701H4).pdf
Main PCB Layout and Parts List (26701P4_).pdf
Chassis Assembly Final Assembly Drawings (B-15R).pdf
Bass Combo Amplifier Final Assembly Drawings (00-317_6_61_62).pdf
Crossover Board PCB Schematics (72961P0).pdf
Crossover Board PCB Layout and Parts List (72961P0).pdf

There are more files....parts lists, owner's manual, an unrelated service note, etc.

[Enzo]

Look on the power supply page.


And your tubes need not be matched.

[bsco]

Look on the power supply page.


And your tubes need not be matched.

nevetslab sent me a bunch of links with lots of stuff....I'll go through them tomorrow....
Cheers

[Reader]

nevetslab sent me a bunch of links with lots of stuff....I'll go through them tomorrow....
Cheers

If the links have good information can they be posted here?
Also curious about the service note mentioned in post #4 for it may have info to other situations even if unrelated to the original question in this thread.
Thanks,
Bill

[bsco]

If the links have good information can they be posted here?
Also curious about the service note mentioned in post #4 for it may have info to other situations even if unrelated to the original question in this thread.
Thanks,
Bill

If you have access to this thread, which it seems that you do, just scroll back up to post #4.....just click on those links or copy and paste into your browser.....Let me know if you can get access.....
Cheers

[Reader]

I have access. I asked because I thought that you were referring to different documents than the one's shown in post #4.
Thanks,
Bill

[bsco]

[QUOTE=Reader;517025]I have access. I asked because I thought that you were referring to different documents than the one's shown in post #4.
Thanks,
OK. No Problem......
Cheers

[nevetslab]

If the links have good information can they be posted here?
Also curious about the service note mentioned in post #4 for it may have info to other situations even if unrelated to the original question in this thread.
Thanks,
Bill

Customer Service Bulletin (CSB0004) -- misidentified color labels on PCB.pdf