Parallel V2?

[sepulchre]

No offense to any TW purists but has anyone ever tried paralleling the two halves of V2? Just using jumpers with no extra parts? I tried searching for any posts but after a time I decided just to ask.

Just curious.

[phsyconoodler]

I bet it would sound pretty fat.I like the way a paralleled tube sounds on the input of an 18 watt amp,not sure how it would sound on a 'wreck.Only one way to find out!

[sepulchre]

Okay, I just found some info about this:

http://ampgarage.com/forum/viewtopic.ph ... sc&start=0

Thanks guys!

[leadfootdriver]

I just went back thu this with the parallel triodes. I built a little single ended Top Boost amp. I tried the PT's with the TB pre, but I thought it was to fat, and lost that sparkle the Vox tone can have.

Check out the Matchless stuff on schematic heaven for ideas tho. http://www.webphix.com/schematic%20heav ... st70s.html

[phsyconoodler]

I'm thinking it would be better to use the unused triode as an extra gain stage,cold bias it and adjust the V2A voltage divider to get the gain level right without a squealing,wretching mess of feedback.

A friend over on the Hoffman forum did just that and he says it's awesome.
Not a 'wreck per se anymore,but killer nonetheless.

[sepulchre]

Check out the Matchless stuff on schematic heaven for ideas tho. http://www.webphix.com/schematic%20heav ... st70s.html

Thanks for the link. It confirmed what I thought so that's exactly what I did. So far it sounds a tad fatter, not too much, and the noise floor is lowered. But I haven't really cranked it yet - this sucker is WAY LOUD so I'll have to take out to my shop at the right time.

[leadfootdriver]

I found a 1978 Vox AC30 schematic where they use the 4th triode before the PI. I tried it out in my little single ended test amp, and I think it's great, It's real dynamic.

It's a 47k plate with a 4.7k cathode resistor unbypased. They also use a .1uf coupling cap into the PI, but a .047 would work too I'm sure. Try it out.

[img966]http://home.comcast.net/~leadfootdriver/ac301978.jpg[/img]