Only if there is degeneration, the pcb design does not permit this type of adjustment.
So having differing values of resistance has virtually no effect, this is why I had instructed earlier, either on this thread or the other one to put in a resistor before and after the junction of the capacitor.
Some members did that and got the results I suggested to them.
This mod is actually better
Last edited:
IRFP250 at Q1 (has to be IRFP250 not IRFP150)
IXTH64N10L2 at Q2
This will get you the sound.
LED Mod + R7/R4 around 3k - Lower noise, better regulation, and adds thermal compensation to the bias circuitry, compared with the stock zener.
Reduce R1 and R2 to 0.22 Ohms (lower if you want) - Not critically important if you have very good resistors, but it does provide some improvement.
Increasing R4 to between 20 Ohms to 23 Ohms - Improves everything a little
IXTH64N10L2 at Q2
This will get you the sound.
LED Mod + R7/R4 around 3k - Lower noise, better regulation, and adds thermal compensation to the bias circuitry, compared with the stock zener.
Reduce R1 and R2 to 0.22 Ohms (lower if you want) - Not critically important if you have very good resistors, but it does provide some improvement.
Increasing R4 to between 20 Ohms to 23 Ohms - Improves everything a little
Last edited:
LED Mod + R7/R4 around 3k - I assume you mean R7/R8 and a green LED. (R4, 18 Ohms, is part of the feedback network).
The models are pointless if they don't even match reality, which is often the case.
Even the Cordell models for IRFP240/9240 are no where near correct.
Even the Cordell models for IRFP240/9240 are no where near correct.
I´m aware of the limitations of LTSpice but it´s a useful tool. Anyway I did not ask for an opinion, but if someone knows a source for a model of IXTH64N10L2
Pico's Magic F6 Trick
I did as well. Started up at 1.5A. Sound really nice. I think I leve it this way for a while.
3k might be a little sissy. As Zen Mod said.
2.5k would be less sissy.
Anything in between would also be ok.
Obviously 3k is perfectly fine, however the performance continues to improve with further current.
I don't think I would exceed 10mA though just to ensure a long healthy life for the led.
2.5k would be less sissy.
Anything in between would also be ok.
Obviously 3k is perfectly fine, however the performance continues to improve with further current.
I don't think I would exceed 10mA though just to ensure a long healthy life for the led.
Last edited: