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In Reply to: RE: Magnavox EL84 mod suggestions posted by Charlie8521 on March 28, 2015 at 12:41:08
I have rebuilt & upgraded these amps. I used K40Y-9 at C7 & C10. I used silver mica at C6 & C9. I rebuilt the power supply with a JJ 40-40-20uF @ 500 volt capacitor. At C1 I used a 100uF Elna Silmic II.
Tube rolling won the Mullard 12AX7 long plate & Sylvania 6BQ5 black plate.
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Confused. I have a 6EU7, two 6q5's, and one 6ca4. Where are you putting the 12AX7?
6EU7 and 12AX7 are about the same tube inside the bottle. Both are twin triodes with a mu of 100. The 12AX7 has a center-tapped 12 volt heater so it can be run on either a 12 or 6 volt heater supply. The 6EU7's two heaters are in series and need 6 volts.
So you'd have to rewire the socket to use a 12AX7, but that's it. Also, if you rewired for a 12AX7, you could try a 12AT7 (mu of 60) to see if that sounds better to you.
My version used 12AX7. Best 6EU7 I heard are Raytheon.
Some of those did use a 12AX7 (obviously not the one that the OP has, though).
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