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https://ampeg.com/support/files/Sche...matics%201.pdf
G-12's got a weak tremolo. It's there, just barely, when the intensity switch is on and it's up all the way. Previously repaired the Echo (easy fix, braid wire), Swapped the tremelo tube, replaced all the .047's and the .22. Measured all the resistors, all good.
Lowered the value of 390k to 220k to increase intensity, no change.
Disconnected wired to intensity pot and measured across, 4M, healthy boi.
Cathode voltage is under spec from the schematic- showing about .7 Volts when on as opposed to 1.2v. I can get it up to spec by changing the cathode resistor to a 1k, but it still is very weak.
With all this in mind, should I just bite the bullet and order a new roach? Is there anything obvious I may be missing?
G-12's got a weak tremolo. It's there, just barely, when the intensity switch is on and it's up all the way. Previously repaired the Echo (easy fix, braid wire), Swapped the tremelo tube, replaced all the .047's and the .22. Measured all the resistors, all good.
Lowered the value of 390k to 220k to increase intensity, no change.
Disconnected wired to intensity pot and measured across, 4M, healthy boi.
Cathode voltage is under spec from the schematic- showing about .7 Volts when on as opposed to 1.2v. I can get it up to spec by changing the cathode resistor to a 1k, but it still is very weak.
With all this in mind, should I just bite the bullet and order a new roach? Is there anything obvious I may be missing?
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