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  1. 6

    Calculating Negative Feedback

    I'm with you on that, but what about the different OT turns ratios giving the 100W OT a gain that is 1.414 times the gain of the 50W OT?
  2. 6

    Calculating Negative Feedback

    Does the 50W amp have half the number of power valves and twice the OT primary impedance as the 100W amp?
  3. 6

    Calculating Negative Feedback

    Here is some hen scratch showing how Vbias ended up in the denominator:
  4. 6

    Calculating Negative Feedback

    The amp is at full rated power when the voltage from the LTPI equals the absolute value of the DC bias voltage. This is a peak voltage and we want rms because the rated power is rms, so the bias voltage is divided by 1.41. The negative sign is used because the LTPI inverts and we need a...
  5. 6

    Calculating Negative Feedback

    So.....that will give you the rms voltage from the voltage divider when the amp is operating at full rated power. Then what? Try this:
  6. 6

    Calculating Negative Feedback

    Good, because women wearing thongs is easily explainable, but men wearing thongs is a total mystery to me.
  7. 6

    Issues with Granger Loop on a 2204.

    I don't think the loop is intended to have unity gain. I think that you're supposed to adjust the Master Volume on your amp after toggling the bypass switch.
  8. 6

    1987x metro loop install problems

    Schematic of Metro Loop
  9. 6

    Effects loop for SV20ish clone

    Some people live on the edge and others live far away from the edge. The LND150 has an absolute maximum Gate-to-Source rating of plus or minus 20V. Unlike tubes, they are serious about this rating and you will, indeed, destroy your device if you exceed it. So those that live far away from the...
  10. 6

    Explain a tremolo circuit?

    Why would this LFO need to push a large amount of current?
  11. 6

    Tube FX Loop Having Problems

    Don't do that. The cathode follower won't work without the 10nF cap. The grid is at the same DC voltage as the junction of the 1k5 resistor and the 100k resistor, so the 10nF cap is necessary to keep it like that.
  12. 6

    Tube FX Loop Having Problems

    I built that loop into an amp and it didn't do that. The bypass circuit drops the signal from the Treble wiper to -35dB. V1B has a gain right around +35dB, so the gain is unity with the Master Volume dimed. The Effects Send drops the signal from the Treble wiper to -25dB with the Send Level...
  13. 6

    Traynor schematic questions

    That's a nice specimen. I sure would like to see a complete set of pictures.
  14. 6

    Traynor schematic questions

    To save space inside the chassis.
  15. 6

    Traynor schematic questions

    I've seen cap cans used in series-connected filter caps a bunch of times. I even have an amp that has a cap can for the top half of the series caps. Pete drew them as cap cans and the amps are wired exactly like the schematic. There are other schematics that are the same way. This is...
  16. 6

    Tube Buffered Effects Loop

    Actually I don't frequent that forum anymore because I got banned for life. I think it was for giving some British bloke a hard time about standby switches, although Paul may have had a grudge against me that also played a part.
  17. 6

    Tube Buffered Effects Loop

    I'm using JSchem. Sometimes I use my own symbols so that it doesn't look like JSchem, but it is still JSchem.
  18. 6

    Tube Buffered Effects Loop

    Merlin has one like that.
  19. 6

    Tube Buffered Effects Loop

    Naw. This one is better because it has a Return Level control. They can both drive an entire spool of cable, but other loops may have other attributes that they excel in making it hard to say that any one loop is better than another.
  20. 6

    Tube Buffered Effects Loop

    I designed it, tested it, and drew it. I have 34 loops for 2204/2203 drawn up. 14 of them are tube and 20 of them are solid state.

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