Hi all,
I've been working on my Marshall JCM900 100W Dual Reverb (EL34s) and have not been able to solve this problem. The amp is essentially operating at half of its normal volume. The tone sounds great, but I compared it to another and there is clearly something going on.
I've gone through the necessary steps to try to fix this: replaced all power tubes, replaced power tube sockets with Beltons, checked voltages to power tubes, bias voltage, power resistors. So far everything looks healthy. Some voltage on one of the power supply caps was slightly lower than expected (around 320v vs 380v), but not sure this is that significant.
Could anyone recommend other issues to look for to remedy this? It's been super frustrating!
As a side note, I have a similar problem with my Silvertone 1483 head, operating at half volume with great tone! (figure they may be similar problems)
Thank you in advance,
-B
I've been working on my Marshall JCM900 100W Dual Reverb (EL34s) and have not been able to solve this problem. The amp is essentially operating at half of its normal volume. The tone sounds great, but I compared it to another and there is clearly something going on.
I've gone through the necessary steps to try to fix this: replaced all power tubes, replaced power tube sockets with Beltons, checked voltages to power tubes, bias voltage, power resistors. So far everything looks healthy. Some voltage on one of the power supply caps was slightly lower than expected (around 320v vs 380v), but not sure this is that significant.
Could anyone recommend other issues to look for to remedy this? It's been super frustrating!
As a side note, I have a similar problem with my Silvertone 1483 head, operating at half volume with great tone! (figure they may be similar problems)
Thank you in advance,
-B
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