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I finished building an orange tiny terror clone a while ago, mainly using information from the thread on this forum. The sound was good, but there was a _lot_ of hum and shortly after building it, it broke down as a result of poor internal design. So I decided to redesign the internal layout and redo all the soldering work. I finished all the work, but now, the amp doesn't produce any sound, just some 50 (or 100?) cycle humm and can't seem to find the problem. Here's what I tried / concluded sofar:
-The tube filaments glow as they should
-The internal DC voltages (power supply) are correct (though somewhat lower with load, which is to be expected)
-There is a very mild hum coming from the speaker. Turning the gain knob clockwise makes the humm slightly louder (expected behaviour). Turning the tone knob clockwise decreases the humm slightly. Turning the volume knob does absolutely nothing.
-Plugging in the guitar decreases the humm slightly and touching the tip of the plug increases the humm slightly.
-Tested the guitar on a different amp: works.
-I don't have access to another speaker cab, so I can't test it, but the cab is brand new, so I doubt it's broken.
As far as I can tell all the connections are correct (I haven't finished checking the entire signal path though). Any thoughts on what the problem could be? Snce I can hear some humm my guess is that the problem is not in the signal path... Maybe a busted (decoupling) cap? How can I test that? I only have acces to a digital multimeter, no scope or such.
The tubes have taken quite a hit due to some design faults earlier (see previous posts), can I measure somehow whether they are dead or not? Any clues on what the problem could be, or where I can start looking?
Thanks in advance!
Roy
-The tube filaments glow as they should
-The internal DC voltages (power supply) are correct (though somewhat lower with load, which is to be expected)
-There is a very mild hum coming from the speaker. Turning the gain knob clockwise makes the humm slightly louder (expected behaviour). Turning the tone knob clockwise decreases the humm slightly. Turning the volume knob does absolutely nothing.
-Plugging in the guitar decreases the humm slightly and touching the tip of the plug increases the humm slightly.
-Tested the guitar on a different amp: works.
-I don't have access to another speaker cab, so I can't test it, but the cab is brand new, so I doubt it's broken.
As far as I can tell all the connections are correct (I haven't finished checking the entire signal path though). Any thoughts on what the problem could be? Snce I can hear some humm my guess is that the problem is not in the signal path... Maybe a busted (decoupling) cap? How can I test that? I only have acces to a digital multimeter, no scope or such.
The tubes have taken quite a hit due to some design faults earlier (see previous posts), can I measure somehow whether they are dead or not? Any clues on what the problem could be, or where I can start looking?
Thanks in advance!
Roy
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