Hi all,
I am working on my first amp build and I am running into trouble that I can't seem to solve. It's a guitar amp with a two stage preamp and single power tube in the main section (shown in the upper half of the schematic). This section works great, and I am very happy with the sound. The problem is with the reverb circuit.
When I connect the reverb circuit, the amp cuts out after a few seconds. If I disconnect terminal C from the reverb driver tube, the amp recovers and plays normally without reverb.
With terminal C disconnected and the amp working normally, the top of the cathode bypass capacitor on the power tube of the main section reads about 64V. As soon as I connect terminal C, the voltage at that point drops to 0 (implying no current through the power tube, and hence the loss of output). I do not understand why this is happening.
If the amp is played at a very low volume with everything hooked up as shown, the reverb works and the output is maintained. But as soon as the volume is turned up >10% or so, the output is lost until the volume is turned back down and the power to the amp is turned off and back on.
I suspect the problem is in the way I have connected the reverb circuit. I'm sure it's an obvious problem but I am at a loss.
Thanks a lot.
I am working on my first amp build and I am running into trouble that I can't seem to solve. It's a guitar amp with a two stage preamp and single power tube in the main section (shown in the upper half of the schematic). This section works great, and I am very happy with the sound. The problem is with the reverb circuit.
When I connect the reverb circuit, the amp cuts out after a few seconds. If I disconnect terminal C from the reverb driver tube, the amp recovers and plays normally without reverb.
With terminal C disconnected and the amp working normally, the top of the cathode bypass capacitor on the power tube of the main section reads about 64V. As soon as I connect terminal C, the voltage at that point drops to 0 (implying no current through the power tube, and hence the loss of output). I do not understand why this is happening.
If the amp is played at a very low volume with everything hooked up as shown, the reverb works and the output is maintained. But as soon as the volume is turned up >10% or so, the output is lost until the volume is turned back down and the power to the amp is turned off and back on.
I suspect the problem is in the way I have connected the reverb circuit. I'm sure it's an obvious problem but I am at a loss.
Thanks a lot.
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