1987 Ampeg SVT LE tubes

[Randall]

That bulletin was put out in 2001, I wonder why they didn't include the SVTHD in that list? The layout of this HD is different than the SVTs in the service bulletin, but it has the 22 ohm resistors and the diodes, so I will follow it.

[g1]

That bulletin was put out in 2001, I wonder why they didn't include the SVTHD in that list?

Those look to all be models that were current production at the time. I'm guessing they were paying for the bulletin to be performed on all the serial numbers listed (warranty).

[Ampeg bass]

Has anyone found a proper schematic?

[nevetslab]

Ampeg SVTHD Service Manual attached

Has anyone found a proper schematic?

SVTHD Service Manual.pdf

[g1]

The '87 LE is not exactly the same as the HD. No exact schematic has been found as far as I know.

[nevetslab]

The '87 LE is not exactly the same as the HD. No exact schematic has been found as far as I know.

This one is about as close to the '87 LE as I have in my files. I have what looks like it was a photocopy attached to the roof of the cabinet. As we all have had to do over the years, find the deviations on the fly, make notes if we remembered to, then forget to scan it or alter the PDF files on the computer.