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  1. Replies
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    I just remember that one because I built a...

    I just remember that one because I built a Harvard and then later was looking at the Vibrolux and thought hey I've seen this exact circuit before lol
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    It's actually Harvard/Tweed Vibrolux. Exact same...

    It's actually Harvard/Tweed Vibrolux. Exact same circuit but the vibrolux adds a triode to run the vibe. Otherwise it's verbatim.
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    You know, I have never noticed that before nor...

    You know, I have never noticed that before nor had it ever dawned on me to consider donating some funds to the forum. The forum has treated me very well over the years. Things are tight at the moment...
  4. Ok I experimented with the plate and screen ...

    Ok I experimented with the plate and screen resistor values for the ef86. The amp has calmed down a bit but could still stand to be calmed down a little more. Should I raise the 33k input resistor...
  5. Doing some play testing at higher volume than I...

    Doing some play testing at higher volume than I could last night. A couple of things...

    Note: the amp had a 12at7 for the reverb, NOT a 12ax7 like the last drawing shows. I did sub in a 12ax7 and...
  6. ^^^^ interesting. I'll keep that thought in mind.

    ^^^^ interesting. I'll keep that thought in mind.
  7. It does have a nice thick piece of corrugated...

    It does have a nice thick piece of corrugated cardboard between the tank and cab floor. And as for the reverb level, the effect at 10 sounds about like the average reverb level at about 3. Was...
  8. Well here’s an interesting problem... I went...

    Well here’s an interesting problem...

    I went to pick up the amp last night after the jam and the sound guy tells me that when you turn up the reverb it feeds back like hell. I get it home, dime ...
  9. The guy I built this for is asking me for a...

    The guy I built this for is asking me for a silicone version. Can I just drop in the different transistors or do I need to make any other changes?
  10. Just to update this thread, the amp got built...

    Just to update this thread, the amp got built using the last drawing and has been in the backline at a local blues club getting hammered on several times a week for about the past 8 months and...
  11. I've actually been in contact with him since...

    I've actually been in contact with him since posting this thread. He comes highly recommended and seems a very nice guy as well.
  12. Need a recommendation for having chassis made

    Looking for a maker that can provide spec'ed chassis with holes cut and face designed/labelled. Will probably be ordering in quantities of 5 or so. Thanks in advance for any help.
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    between orlando and daytona

    between orlando and daytona
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    Can someone help me understand the different...

    Can someone help me understand the different voltage ratings on this data sheet? 2000v 800v & 450v

    http://www.jj-electronic.com/images/stories/product/power_tubes/pdf/el34_e34l.pdf
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    Actually haven't even hooked the NFB up yet. I'll...

    Actually haven't even hooked the NFB up yet. I'll try connecting it and see if that helps.

    edit: hooked up the forgotten nfb connection and that cleaned the whining right up. Can't believe I...
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    ok the 1 ohm resistor was open. Never had that...

    ok the 1 ohm resistor was open. Never had that happen before... anyway, swapped it out and biased down and each got the cathodes down to .035~ each across the 1r. That's still too much, right? 35w...
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    50w Plexi build -- odd operation

    This is a fresh 1988 50w plexi build using the chassis, PT and OT from an Ampeg VT-60. The amp is basically what's in the layout but with a 22k bias pot, no impedance selector, and added ppimv....
  18. removed the chip and no smoking. Still have...

    removed the chip and no smoking. Still have -27vdc feeding those resistors as well.
  19. No I sure don't have anything like that. No...

    No I sure don't have anything like that. No biggie ordering one though. Will try the surplus store first if I can get by there tomorrow. Thanks for the fast response.
  20. Peavey Classic 50 reverb chip got inserted backwards

    And started smoking the pair of 22r resitsors that are on the power supply for the reverb circuit. Turned the chip back around and it still overheating the resistors so I shut it down. Is there...
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    Looking for a good tech near Oceanside, CA

    One of my amp builds is in Oceanside and has hum problems. I'm willing to have it shipped back to me if it comes to that but thought I'd try here first to see if someone was willing to help out (for...
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    I think I may have just figured out the problem....

    I think I may have just figured out the problem. I used a Fender style LDR but the drawing shows CL1110M and at fliptops website that's a whole different part with a whole different price lol.
    ...
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    It might also be worth noting that the tremolo...

    It might also be worth noting that the tremolo triode has an oscillating plate voltage and cathode voltage. Drawing shows 95v and 1.45v and I'm getting (with speed maxed) 100-130v and 1-1.3v, so a...
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    Ampeg GU-12 build and tremolo not working

    I've gone over and over the drawing, been taking resistance readings through sections of circuits, looking for missed or incorrect connections and keep hitting a dead end. are there any mistakes in...
  25. Well the cardboard and vinyl bag didn't quite do...

    Well the cardboard and vinyl bag didn't quite do the trick so I'm gonna put a governor on the pot like Juan suggested. No matter, there's plenty of reverb to spare anyway. I'll just know that when I...
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    lol @ "audio jewelry" :D

    lol @ "audio jewelry" :D
  27. lol In this case it begins so subtly and...

    lol


    In this case it begins so subtly and slowly that I suspect it won't take much to curb it out.
  28. Enzo you were correct about the acoustic...

    Enzo you were correct about the acoustic feedback. If I set the tank outside of the cabinet the ringing does not occur at full max on the reverb pot. Moving it to various distances from the speaker...
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