I've had an ongoing problem with a blackheart little giant I've had for a little over a month. I had always thought it had too much treble, and after trying to overload the input stage with a clean signal from a zoom b2, I noticed a different problem as well, but the timing was probably a coincidence. I wonder if these 2 problems are related.
With the volume on zero, there is a significant amount of signal being sent to the speaker (vintage 30 12"), I would guess it is approximately the volume you'd expect if the volume was up to 1 or a little more. The sound is clean if you pick one string, but sounds distorted if you play a chord. The most unusual thing is that as you turn the volume knob up, the sound level coming from the speaker actually gets quieter and more distorted until it is almost non-existant at around one on the volume knob. After that the distortion starts to clean up and volume increases fairly rapidly, until at 2 and a half the volume it sounds like a normal amp.
I've tried to go the warranty repair route, but after dropping it off at the store for five days they gave it back saying that that's just the way they are.
I've done some repair work to another tube amp I have but I'm certainly no expert. Any thoughts? I suspect perhaps a grounding issue or is it possible the rectifier for the DC filaments is in backwards suppling 6 vdc to ground? Another fellow thought it sounded like a bad filter cap connection in the preamp.
With the volume on zero, there is a significant amount of signal being sent to the speaker (vintage 30 12"), I would guess it is approximately the volume you'd expect if the volume was up to 1 or a little more. The sound is clean if you pick one string, but sounds distorted if you play a chord. The most unusual thing is that as you turn the volume knob up, the sound level coming from the speaker actually gets quieter and more distorted until it is almost non-existant at around one on the volume knob. After that the distortion starts to clean up and volume increases fairly rapidly, until at 2 and a half the volume it sounds like a normal amp.
I've tried to go the warranty repair route, but after dropping it off at the store for five days they gave it back saying that that's just the way they are.
I've done some repair work to another tube amp I have but I'm certainly no expert. Any thoughts? I suspect perhaps a grounding issue or is it possible the rectifier for the DC filaments is in backwards suppling 6 vdc to ground? Another fellow thought it sounded like a bad filter cap connection in the preamp.
Comment