New use for VVR..

[azatplayer]

Im in the midst of a single ended thing that i keep putting down and coming back to, just have not been able to get the balance right for an age, but having some great success with it lately.
Part of my more recent issue when i rebuilt it again, was the PT i spec'd was not high enough in B+. Its EL84 so was looking for 250V but was getting more like 220.
Its got a centre tap and was hooked up with a simple 2 diode rec, so i thought to myself today, what not lift the CT, put a bridge rec in, and use a VVR to dial in that perfect 250v on the plates? Brilliant idea and brilliant result!
B+ soared to 370V with the bridge, dropping back to 250V was great!

Its been really cool to try different voltages and hear what the differences are, and i found i really like 200V on the plates as well.
Biggest difference has been the amount of compression you get at 200V, really nice compression, but at 250V the headroom and punch rise dramatically while the volume is not so dramatic.

Pretty cool designing tool!

[dorrisant]

Thanks for posting this info... Maybe you could post a comparison chart or some sound clips at specified voltages so we can hear the difference.... ?
Tony

[Colossal]

Hey Azatplayer,

Yes, very cool use for a VVR! Finally got that PT sorted out, eh? I want to build a test bed for amp ideas and use a VVR for each B+ node. Each node would be switchable as series or parallel and separated from the others in the power supply with a diode so there is no current thievery. It would be very nice as a design tool to dial in any plate, screen, or preamp voltage.

[azatplayer]

Haha yeah Dave, of a fashion of course should it fail, them little eightyfours are gonna get a bit excited at 370v tho they have taken. A beating at that level, in the interests of science of course!