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  1. No worries, Tim. it's a little slower going...

    No worries, Tim. it's a little slower going trying to learn something this way, so I appreciate the help.



    I disconnected all the compensating components, as well as the MOVs.
    Here is a...
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    Right, I understand the principle when applied to...

    Right, I understand the principle when applied to a traditional grounded cathode/emitter stage. Would the cathode impedance remain the same in this configuration?:
    54333

    This is similar to what...
  3. okay, there's only so many times I can get the...

    okay, there's only so many times I can get the same results before I have to admit I'm in denial and the bandwidth and phase response of my amplifier is total shit.
    Using my venerable 465, I got a...
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    Oh yeah, I sometimes forget that the seasons are...

    Oh yeah, I sometimes forget that the seasons are opposite us down where the water circles the drain the wrong way
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    ^^^^^ exactly right. The audible symptoms are...

    ^^^^^ exactly right. The audible symptoms are usually very low output volume and heavily distorted. Swap them out with some pulls and see if it fixes it. If so, then one of your tubes is shite.
    If...
  6. I knew it was the regulators ;)

    I knew it was the regulators ;)
  7. Right. That's how I've been trying to check the...

    Right. That's how I've been trying to check the phase shift. But I've never done it before. So when I get results I'm not expecting, it makes me question whether or not I'm doing it correctly.
    I've...
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    I think I know what he's referring to. In the...

    I think I know what he's referring to. In the Crate Blue Voodoo 60, they use a fixed bias configuration that allows the user to switch between 6L6s and EL34s without the need for a manual bias...
  9. yup

    yup
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    Bootstrapped Gain Stage Theory

    I have a couple of questions about Bootstrapped stages. First, is there a "universal boot" equation? Where input impedance can be calculated whether the stage uses a FET, BJT, Tube, or op amp?
    Also,...
  11. One other thing – I'm using Max Robinson's paper...

    One other thing – I'm using Max Robinson's paper on Amplifier Compensation (found here:Design Stable Feedback Loops). He indicates that the first breakpoint on his Newcomb D10 amplifier was at 9.5kHz...
  12. Still, I'm not sure.. I think I'm doing something...

    Still, I'm not sure.. I think I'm doing something wrong. The output maintains a pretty steady gain approaching 20kHz. So, if there was there was a 45 phase shift at 13kHz, wouldn't that be where I...
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    Variable HV Bench Power Supplies

    I've been thinking about building/getting a HV bench power supply for prototyping, testing, experimenting, etc. I know Heathkit offered a few options.
    Ideally, It should be variable within a range...
  14. trobbins, I'm not sure how you mean swap gain...

    trobbins, I'm not sure how you mean swap gain steps. Could you elaborate?


    I swapped the output transformer and installed the one I originally bought for this project. The one I'm using now is an...
  15. Tubes' and nickb, thanks for your feedback. ...

    Tubes' and nickb, thanks for your feedback.

    tubeswell, I actually think the pentode is a better driver for the reverb. I gotta run in a few minutes to go do sound for a show, but I can go into it...
  16. - I'm nearly finished with the circuit design....

    -
    I'm nearly finished with the circuit design. All the stages are done except the mixer:
    ...
  17. That’s weird. I did see a pot in yours, but it...

    That’s weird. I did see a pot in yours, but it was backwards and not lined up properly.
  18. okay, I saw what I did wrong (I think). after...

    okay, I saw what I did wrong (I think). after adding a global ground, I was getting an error that said Could not open library file "pote.lib" when I tried to use the "run" function, because I didn't...
  19. That's no good. Figures, that's the thing...

    That's no good.


    Figures, that's the thing that was tripping me up to begin with.
    So, I was able to set it up in both Wine and the macOS version so the appropriate .lib files and schematic...
  20. Those sneaky little bastards!

    Those sneaky little bastards!
  21. - Okay! Big night for me. I might actually just...

    -
    Okay! Big night for me. I might actually just suck a little bit less at LTspice (in that I was able to figure out how the directories/.inc/.lib/.asy/etc parts of the program work for the most...
  22. Right, this must be LF problems described. ...

    Right, this must be LF problems described.


    Okay, I see what you mean. Interesting. Can you recommend any articles or literature illustrating discrete compressor circuits?
    Also, nice use of...
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    Word! :thumbsup:

    Word! :thumbsup:
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    I've been following this thread along a little...

    I've been following this thread along a little bit. Nice work sussing it out, Randall. I noticed that this amp is nearly identical in design to the Crate V30. I also notice that some of the problems...
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    checked all the ground lead connections to the...

    checked all the ground lead connections to the brass L bracket? I should have mentioned that in the "common problems" post.
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    another thing I've also seen which is more rare,...

    another thing I've also seen which is more rare, but can still cause problems is a faulty reverb transformer.
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    So, you replaced all the film caps?

    So, you replaced all the film caps?
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    Couple of things to check: - The 820Ω feedback...

    Couple of things to check:
    - The 820Ω feedback resistor. Sometime this warped boards can stress the solder joints and leads. pull it off the board to give it a little strain relief.
    - The coupling...
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