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SO this is many years too late but I hate threads that end without a confirmed fix so here I am to say Yes it was the OT and that amp was fixed and honestly...
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Any chance the schematic is still available? I don't want to dig into one of these with no reference. The link seems to be dead
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I wish I had taken a screen shot of the occilation on my scope. it was a very weird charge and discharge, kinda reminded my of scoping secondary ignition...
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The statement about one amp having a rectifier vs. a phase inverter indicates sunn drone might not understand why amps, push pull amps, cannot have an uneven...
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Ok so tubes out i confirmed my voltages are all ok. No oscillation with no tubes/ current draw.
Hooked up my scope to the output and I have...
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Sunn Model T reissue thudding
So I haven't been doing much amp work lately, 5 month old baby needs to nap, but I did take on a Sunn Model T reissue to change out power tubes.
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Yeah that is exactly what is going on. I'm a mechanic during the day so I'm gonna grab my big tap set and thread the anchors and use a socket, a bolt, some...
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Thanks Chuck, I'm also familiar with that method, it works grat for TOM bridge anchors. Unfortunately there are no threads in the Jazz Master bridge anch...
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Jazz Master Bridge Bushings
So I got a mastery bridge for my JazzMaster for my birthday! only problem is that I need to remove the bridge bushings in order to install the master ones....
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Cannot Bias amp with Mosfet follower drivers...
So my 4 kt88 bass amp with mosfet drivers is giving me some trouble since I changed to a dual rail power supply set up. When I try to bias the power amp I...
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Hey good to see that this amp is going strong. I have implemented many of your strategies into my own ~200 watt amp with a kt88 quad. I should post my schem...
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yeah my problem is mostly a mechanical rattle now, not so much a microphonic issue. i think i have it beat. i think these big envelopes on the power tubes...
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ok fair enough, i think it is mostly due to the fact that my chassis is thin steel and it vibrates too easily. i'm gonna brace it and see if that helps. I...
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microphonic EH KT90's
I am using some KT90 tubes o n a home build bass amp and I've noticed that they pick up a lot of the cabinet vibrations and rattle really bad especialy when...
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Ok cool, that is how I have done it. I really like the features incorporated into this amp....
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There are some really good ideas here. I have been experimenting with the bypass cap on cathode biased power tubes and really liking the response of lower...
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Yeah I figured there was no summing effect. I just wanted to check if there was an added benefit beyond the summed voltage handling. I just have noted that...
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Capacitors in series
Just wanted to try and confirm something, I cannot seem to find information on.
My question is; Do the ripple current ratings sum or divide...
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This is a very interesting, I assume it may be the result of the EL34's true pentode construction?
Also I cant seem to find the spreadsheet...
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For some reason I feel like you usualy want 10-15% of the screen voltage. But that might just be me confusing memories.
I say better to have...
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as far as the differing dropping resistors goes they were likely changing them to achieve a certain preamp voltage on the later amps with the higher B+. Although...
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