Hi there
I have a yaqin 5881 tube amp (schematics attached). I have done a few mods ie change the coupling caps and re-wire the output to triode. Does anybody know how to mod the magic eye tube / circuit so the peak level indicator displays at lower volumes?
I have tried shorting the 10k resistor from the 8ohm output tap. That increases the sensitivity a little however the volume still needs to be quite loud for the indicator to move. Any suggestions would be appreciated.
I have a yaqin 5881 tube amp (schematics attached). I have done a few mods ie change the coupling caps and re-wire the output to triode. Does anybody know how to mod the magic eye tube / circuit so the peak level indicator displays at lower volumes?
I have tried shorting the 10k resistor from the 8ohm output tap. That increases the sensitivity a little however the volume still needs to be quite loud for the indicator to move. Any suggestions would be appreciated.
Attachments
Perhaps replacing that standard 1N4148 silicone diode with a more sensitive type like a schottky or even a germanium would help. Reducing or removing the .1ufd cap after the diode could also help. It's there to smooth out the rapid fluctuations of the signal and give a more stable indication. Of course you'll loose the intended purpose of a peak indicator.
Another possibility would be to take the drive for the 6E2 from one of the output tube plates and capacitively couple it and pad it down substantially. You could use a 100K resistor and 10K pot and this would give you a substantial adjustment range. Use a 2W resistor, and 1kV film or ceramic cap of about 0.022uF - 0.047uF or so.. And be careful as the ac + dc voltage components present with signal applied could be 700V - 1kV at full power depending on supply voltage. (Figure up to 2X the supply voltage at the CT of your OPT and you get the picture.)
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