[DIY] OT: Tube amp disaster

[Haible Juergen]

	>Im no tube expert (eric you here still) but I beleive that
incorrectly
	>matched
	>impedence on the output stage is about the worst thing you can do
to a tube
	>amp.
	>Im almost SURE a remember reading that this will cause oscillations
and
	>possibly
	>output transformer being melted.

I think the problem is a too high impedance. Pentodes are current sources
more or less, so higher impedance means higher voltage - overvoltage.

JH.