Metatron_X
Member
- Messages
- 280
This amp has been blowing screen grid resistors on the same side, three times since I've owned it - brand new from the factory, for the past 6 years. It's a Brunetti 059, 120W, EL34, blackface.
When I first purchased the amp it blew a fuse and tube withing the first two weeks of owning it. I took it in, because it was under warranty and I wanted to make sure it wasn't a more complicated issue. I'm just now realizing that there might be a bigger issue there since it keeps happening on the same side every time and the tubes are blowing prematurely. This thing blows through tubes faster than any amp I've owned. Is there a common cause for regular screen grid resistor blowout? It's a 1K, 4W, 1% screen grid resistor. I've changed the resistor myself twice and I've done plenty of work on prior amps (mods etc) I'm just not good at tracing specific issues. I understand the safety precautions.
Honestly this amp has been a cancer as long as I've owned it and help from Italy has been nearly nonexistent unless I want to ship it there and back on my dime. When I got it back from the first tech that I took it to years ago the foot switches started breaking, one after another, three in all. I sent it back to Italy to have it fixed. Brunetti claimed that someone took it apart and reassembled it incorrectly... If not the amp tech then who? That fiasco cost me $200 and the amp has never really been "right" from day one. About six months ago it developed a new issue where the lead channel sounds like it has an octave note at all times and the breakup is squishy and farty.
If anyone has any ideas where to start looking I'd appreciate knowing.
When I first purchased the amp it blew a fuse and tube withing the first two weeks of owning it. I took it in, because it was under warranty and I wanted to make sure it wasn't a more complicated issue. I'm just now realizing that there might be a bigger issue there since it keeps happening on the same side every time and the tubes are blowing prematurely. This thing blows through tubes faster than any amp I've owned. Is there a common cause for regular screen grid resistor blowout? It's a 1K, 4W, 1% screen grid resistor. I've changed the resistor myself twice and I've done plenty of work on prior amps (mods etc) I'm just not good at tracing specific issues. I understand the safety precautions.
Honestly this amp has been a cancer as long as I've owned it and help from Italy has been nearly nonexistent unless I want to ship it there and back on my dime. When I got it back from the first tech that I took it to years ago the foot switches started breaking, one after another, three in all. I sent it back to Italy to have it fixed. Brunetti claimed that someone took it apart and reassembled it incorrectly... If not the amp tech then who? That fiasco cost me $200 and the amp has never really been "right" from day one. About six months ago it developed a new issue where the lead channel sounds like it has an octave note at all times and the breakup is squishy and farty.
If anyone has any ideas where to start looking I'd appreciate knowing.