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kevin gilmore

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Everything posted by kevin gilmore

  1. kevin gilmore
    don't build the DHT one unless you plan on spending piles of cash on tubes
  2. kevin gilmore
    I really like that knob
  3. kevin gilmore
    845 in a megatron configuration is what you want
  4. kevin gilmore
    so the options for the new woo amp 1) plate resistors, they already said its not this 2) inductors, they already said its not this 3) center tapped inductor, you get about 6db of gain with this. 3a) push pull output transformer. all sorts of issues with gain and power with this 4) solid state current source maximum voltage gain of 6sn7 is about 20, maximum voltage gain of 300b is less than 4 somewhere there are likely to be input/interstage transformers and then you are still going to have trouble getting to a voltage gain of 500 or more if you want some feedback to reduce the distortion. the viva evidently is also low on gain, and uses and output transformer. why people produce shit like this I do not know
  5. kevin gilmore
    pretty sure it was posted that340.zip
  6. kevin gilmore
    That is a 30 amp nema connector.
  7. kevin gilmore
    Stax mafia boards linked to in the stax mafia boards thread i highly recommend you doing a diy-t2 as your first amplifier. More than one person has done this. If you survive you will learn a lot less dangerous is the supersymmetry dynalo with the golden reference power supply then the current feedback amp balanced or single ended with the golden reference power supply more challenging is the uber2 amp
  8. kevin gilmore
    i'm not sure that the burson like things are going to be good for servo opamps. from what I have seen all of these things are bipolar input and have significant input offset current. Plus they drift with temperature. A low offset jfet input slow opamp is what you want for a servo
  9. kevin gilmore
    on the ksa5 the servo's are in the negative feedback loop. So they can influence the sound a little bit.
  10. kevin gilmore
    the circlotron boards are 900V
  11. kevin gilmore
    same size board, up to 35mm caps, had to move the pass transistors, needs checking silicon carbide rectifiers 100mm x 109mm goldenreferencelargecap.zip
  12. kevin gilmore
    that was for the alps quad pots as I remember
  13. kevin gilmore
    The Zener voltage minus 1.4V (darlington) plus about 1 V across the control transistor specifies the minimum output voltage. The zener guarantees enough start up voltage to power up the opamp so something like 8v with a 5v reference
  14. kevin gilmore
    The opamp needs to be able to run on what the output voltage is, and the zener plus 1.4V has to be less than the desired output voltage.
  15. kevin gilmore
    Cp1117 optional part for doing controlled power up. For example tube circlotron. If you don't want it, do not populate the part.
  16. kevin gilmore
    will fix the package in a minute. moved the resistor and diode to limit turn on charging current on the caps new picture and board file someone please check for errors
  17. kevin gilmore
    here is the new single, a little longer same width circlotronhvpowersinglenewver3swt.zip
  18. kevin gilmore
    yes I think you are right.
  19. kevin gilmore
    which current limit circuit? on the singles board, to put the ac input on the front requires a size change
  20. kevin gilmore
    I can certainly do a version with a ground plane. there is no ground on the 900v board, so it would be the entire top side and whatever clearance we decide. say .2 inches here it is without the keepout for the caps and .15 inch clearance
  21. kevin gilmore
    The 1k input is to prevent oscillations if you short the input to ground. The 20k is in parallel with the bipolar input stage. So the result is something on the order of 10k input impedance. Maybe a bit less.
  22. kevin gilmore
    way under a microvolt. pain in the ass to measure.
  23. kevin gilmore
    that has to at least double the capacitance of the cable. probably more because the bias wire is no longer shielding the stator wires. stupid fucks.
  24. kevin gilmore
    works fine, more diode switching noise gets thru. Also requires more voltage differential as that current source eats up about 4v.
  25. kevin gilmore
    This is yet another attempt to make one amp that does both like the malvalve and RKV. You can optomize for one or the other but not both.
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