SuperBee
4001 posts
Aug 17, 2016
5:34 AM
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a while back I posted photos of an ampeg Jet I picked up in trade.
It was kind of a jet. Started out as a J 12 B but had no original circuitry.
Only original parts were cab, handle, knobs, chassis, transformers. Maybe one pot and valve sockets.
PI had been rewired for more gain than original circuit and power tubes were 5881 rather than original 6V6.
I left the power amp as it was but I rebuilt the preamp, tremolo and phase inverter circuits.
Having done that I've a much clearer idea of how I'd lay it out differently if I did it again, but it all works and I'm quite happy with it. I think. I intend to play it a while in garage jams and band practice and see how it goes.
Just one thing bothers me and I haven't been able to get my head around the issue. Maybe someone here can steer me right.
When I switch the tremolo on, it starts up immediately and it's strong and deep. But it starts out fast and gets slower as I rotate the knob clockwise. I've no idea if that is how it's supposed to work but I'd expected it to start out slow and get faster as I turned the knob.
I'm not clear on how to rewire it to make it operate that wAy.
I haven't been able to find any info which clues me into what goes on with this, and just can't seem to get my brain around the principle of what is going on with it. I need a nudge
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