[DIY] OT: Tube amp disaster

Haible Juergen Juergen.Haible at nbgm.siemens.de
Wed Aug 16 12:03:50 CEST 2000


	>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.




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