Tube Amps / Music Electronics
|For current discussions, please visit Music Electronics Forum.||New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!
|Listen to great tunes streaming live right now!|
|previous: Mike No, I have eliminated the vibrato.<... -- 9/27/1999 10:10 PM||View Thread|
|10/1/1999 1:26 PM|
|Doc||Re: 6AU6 Tube|
In triode connection, the 6AU6 should have an amplification factor (mu) of about 36, and can be run at 250v plate supply at a current of 10-12ma. You can use a 100k plate load resistor like the typical 12AX7 circuits we're used to, but the cathode bias resistor would be relatively small. A 330 ohm unit will give a grid bias voltage around -4v.
How much of a voltage gain does the stage need to provide? I'm not familiar with the D.T. EFX loop circuit. Is the triode used as an output buffer to the effects, or a return amp with (possibly adjustable?) voltage gain capability? Most gain recovery stages don't need a VG of 10+. They can get by with less than 10. A 6AU6 in triode would provide a gain inbetween that of a 12AX7 and 12AU7.
As Ned suggested, you could easily convert to a single triode having the same gain characteristics of a 12AX7 using a 6AV6, or a slightly lower gain but less microphonic 6AT6, use the D.T. component values and be done with it. But you could try the 6AU6 wired in triode first as an experiment.
|Mike It's a parallel effects loop. I bel... -- 10/2/1999 3:16 PM|