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  1. 6

    NAD! Any Traynor guru's around?

    The screen grids already have a shared 1K resistor. Your amp is very close to a Marshall JTM45. I would seriously consider putting it in operating shape and playing it awhile before attempting any mods.
  2. 6

    Major output transformer wiring

    I thought the OT had multiple secondary windings and the Christmas tree was a break-out box for those windings.
  3. 6

    Treble Peaking formula?

    Whereas there is a lot of variation in the subscripts (though they cluster around a small number), the convention for upper and lower case is remarkably consistent. It is actually faster for me to type "(sub)" than it is to track down the "sub" button, place the cursor, type the value, then...
  4. 6

    Treble Peaking formula?

    Fine. R(sub)p is upper case and it is the DC resistance of the plate resistor. r(sub)p is lower case and it is the AC resistance of the plate.
  5. 6

    Treble Peaking formula?

    The absence of a readily available subscript and superscript key is a little annoying on a forum that discusses mathematics. R(sub)g was the grid stopper resistor and R(sub)c was the grid leak resistor here in the 'States for a long time, but R(sub)g seems to be used for the grid leak more and...
  6. 6

    Treble Peaking formula?

    Upper case letters tend to designate components external to the tube while lower case letters tend to designate internal characteristics.
  7. 6

    Treble Peaking formula?

    You're not writing that correctly for single-line notation. Look at how JohnH wrote it. What you wrote equals 0.0165 . An asterisk is frequently used in multiplication for clarity. 1 / (6.28 * 2.2uF * 47K) = 1.54Hz.
  8. 6

    Treble Peaking formula?

    No it doesn't.
  9. 6

    Treble Peaking formula?

    The impedance of the cap equals the resistance of the resistor and the phase shift is 45 degrees and your formula is correct, but your calculation is off.
  10. 6

    Does physical size matter on capacitors?

    It is the Class 2 ceramic capacitors with the barium titanate dielectric that exhibits the DC bias phenomenon. Other capacitor types don't do that. 3300pF and 2200pF @ 3kV are almost certainly Class 2. There is no DC across the capacitor when it is used as a bright cap like this, so the...
  11. 6

    NAD "Ceriatone Chupacabra"

    In addition to gain, Pussy Trim also alters tone. At 50% you almost have the classic Marshall treble-peak thing with the 470K/470pF.
  12. 6

    Fender Bassman

    According to Randall, he used a customer's Princeton without his permission, gutted it, put a jacked-up Bassman circuit in, and installed a 12" speaker. This is the only connection I have seen between a Princeton, a Bassman, and an amp in the early days built by Randall. Randall talks about...
  13. 6

    Fender Bassman

    The Bassman Ten 70 Watt is a lot like a Bassman 135 except with two power tubes. The Bassman 70 is more like the sixties Bassman amps.
  14. 6

    Fender Bassman

    The JTM45/5F6-A Bassman is a completely different animal than the '81 Bassman. 70 watts is a little skinny for bass if there is a drummer involved. Compressor/Limiter is useful with 70 watts when competing with drummers. The '81 Bassman 70 is kind of an interesting amp. It's got those...
  15. 6

    Sovtek - Electro Harmonix Mig 50 Amps

    Bruce got it wrong. It's easy to tell because it would blow up as drawn. The multiple errors make it unlikely that he had an actual amp in hand. You don't have to look very far to find a shared cathode version (aka JTM45 version). Look at the pictures in post #3.
  16. 6

    Sovtek - Electro Harmonix Mig 50 Amps

    The schematic.
  17. 6

    Sovtek - Electro Harmonix Mig 50 Amps

    Bruce got it wrong.
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