[sdiy] sort of OT: The virtues of solid state bridge rectification vs. tube half-wave rectification

[anthony]

I was wondering about other effects besides sag. Sag only happens when you 
run an amp in Class AB1 Class AB and Class B. I'm making a push-pull amp, 
but biasing it to be almost always Class A. I figure with only 2 EL34's I 
can get away with it easilly. Probably even easier with 2 EL84's - which I 
may end up using since I actually HAVE those, but I was saving them for an 
amp that actually WOULD have some sag: an AC15 clone with a 6AX5GT rectifier 
and a huge choke filter. Heck I still might not get sag from that. Chuck the 
choke maybe or use a 6X4 instead...

> Tube rectifiers will exhibit "sag" when there's a big current draw. In a 
> guitar amp, hitting a chord hard (with the amp's volume up) will create a 
> big need for current, briefly pushing the rectifier into a sagging 
> condition and thus causing more distortion in the amp. In extreme cases 
> it's like the amp's response is spongy because the impact is gone.
> --
> john
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