[sdiy] ideas for a tube-based tremolo using parts I have at hand

[anthony]

I have a small circuit board with two 7-pin mini tube sockets. It was 
originally for deflector amps from an oscilloscope which used 6J6's

I wanted to put a tube-based tremolo in a small metal enclosure that I 
already have using this PC board with the tube sockets. The board would be 
easy to modify for what I want to do because many of the traces are very 
wide.

I wanted to do a variation on the tremolo for the VOX AC4. This circuit uses 
a 12AX7 for the PSO and an EF86 (I think) for the preamp.

I though I could use one of the billion or so 7-pin pentodes (like 6AU6, 
12AU6, 6GY6, etc...) for the preamp part and a 6J6 for the PSO.

The biggest thing I'm unsure about is using this kind of dual-triode in 
place of a 12AX7 because they share a cathode. From what I remember of the 
AC4 schematic (I'll have to consult it again to be certain I guess) the 
second section of the 12AX7 was being used as a follower, which may not be 
necessary with the 6J6. I've seen a lot of circuits using 6J6's just tying 
the anodes together and using it like one triode. I can't imagine a 
tube-based pahse-shift oscillator being TOO fussy.

I do have other triodes as well like 3HQ5's and such.

I know it would most likely be easier to do it with 12AX7's and I do have a 
bunch of them. It's just that I imagine how this will look with the shorter 
7-pin tubes just peeking out through the top of the box, covered with a 
curved piece of perforated steel...