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Success! I took out the pre-amp board and examined it. Nothing untoward found. Took the chance to clean up input jack sockets, and pulled out and re-made...
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Ampeg SVT II (SLM) Gnarly Hum
I have recently taken delivery of a 1992 St Louis Music (SLM) Ampeg SVT II. When the amp is turned on (standby on) there is only a very faint sound of my...
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Yep, sorted this problem on a couple of Marshall combos dating from the 1990's by plugging a patch cable across the effects loop (fine if you are not using...
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Yep, sorted this problem on a couple of Marshall combos dating from the 1990's by plugging a patch cable across the effects loop (fine if you are not using...
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Thanks guys, I should have said I'm actually in the first stages of amp design on this one so issues such as 5V filament current draw will be dealt with by...
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Switchable Tube Rectifiers in 5E8-A Style Tweed Twin
Just wondering about how to have variable "Sag" on a 5E8-A style low powered tweed twin. Obviously this design has a fairly inefficient but stiff...
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Just an update on the above thead to complete the story for anyone researching Ultralinear in Bass amps.
I took the B+ from the "downstream"...
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I fitted a shield can to the Phase Inverter valve. I ran the amp through a dummy load checking with a signal tracer and the screeching has gone!! So I guess...
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PDF, I don't have a screening tube installed at the moment, but do have a spare available, so will drop it in and let you know how I get on!
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I've just had a thought, my layout is such that the output transformer is quite close to the phase inverter valve, and the 'half' of the phase inverter which...
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Right, I disconnected 500pF cap and all that happened was the signal tracer parasitic frequency of oscillation went up.
I then disconnected...
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The amp implementation of NFB is as per Marshall/bassman style amp, into the bottom of the phase inverter.
I'll remove the cap and see what...
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Thanks for the quick reply Jazz, I can try that, but wouldn't the amp howl uncontrollably from switch-on with OT leads the wrong way round? The amp can play,...
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I forgot to say that I tried different 12AX7 valves in the V3 position and even a 12AT7, but the noise is still there.
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Distortion from 1 half of long tail phase inverter
I've spent the last few months turning a friends crappy Peavey 2x10 combo into a 50W Plexi a-la Kevin O'Conner's TUT3 book. There has always been a less than...
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Big_teee - I've got a pencil drawn schematic, but its a few revisions out of date!!
In words, my set up in terms of electrical flow is as...
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Just an update to say I've added a 100ohm 10w flameproof resistor between the 1st 100uF cap and 2nd 100uF cap, taken b+ from second cap, so I've got a C-R-C...
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