05-10-2015, 09:54 AM
Well I had a chance to play through it earlier and while channel two was reasonably quiet and sounded okay at low volume, it quickly farted out big time when I cranked it up.
By the way, I'm playing bass through it and the cab is a fEARful 15/6.
Channel one had a lot more hiss but it had a 12AX7 as opposed to the 12AU7 in channel two.
Again, channel one seriously farted out at higher volumes, I mean really bad.... The 15" speaker was really suffering so I backed right off....
BassHog queried as to whether I had the output valves biased too cold - they were...... My bad.
I adjusted the bias, with a high plate voltage of 530v I set the current at 39ma and that tightened the sound up a bit. However, it was still distorting badly.....
The 15/6 isn't a sealed cab which won't help with poor damping issues I know.
Cheers
Grahame
By the way, I'm playing bass through it and the cab is a fEARful 15/6.
Channel one had a lot more hiss but it had a 12AX7 as opposed to the 12AU7 in channel two.
Again, channel one seriously farted out at higher volumes, I mean really bad.... The 15" speaker was really suffering so I backed right off....
BassHog queried as to whether I had the output valves biased too cold - they were...... My bad.
I adjusted the bias, with a high plate voltage of 530v I set the current at 39ma and that tightened the sound up a bit. However, it was still distorting badly.....
The 15/6 isn't a sealed cab which won't help with poor damping issues I know.
Cheers
Grahame