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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: what's up with my RH amp posted by DAK on December 9, 2014 at 12:37:28:
Sounds like your voltages are nominal, if 'in the ballpark' is correct.
So you can go about this two ways. You can signal trace it, or signal inject it.
With injection you would pump the signal in through a coupling cap to the grid of the power tube. In this case have the driver tube out of the socket. If it works the problem is with the driver tube.
With tracing you observe the progress of the signal through the circuit. Lacking a scope, get a cheap amp (preferably tube, they are a lot harder to damage) and set up a probe consisting of an audio cable with a small coupling cap on the end of it, tied to the input of the cheap amp.
Look for the signal by putting the open lead of the cap on the cable (which we will call the 'probe') on the plate of the driver tube and see if you can hear anything. If not, go back to the grid of the driver tube. Maybe the signal just isn't getting to the grid....
In this manner you will find the problem very quickly. Be on the lookout for subtleties like in correct resistor values (maybe a red band where it should by orange or yellow), signal wired into the cathode rather than the grid, that sort of thing.
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Follow Ups
- Do you have an oscilloscope? - Ralph 12:05:44 12/10/14 (0)
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