guitar speaker / was Re: Tube challenge!

[Haible Juergen]

	>You should be carefull with this.
	>Lots of tube amp end stages can get broken if not loaded with the
right
	>(complex-)impedance. the outputtransformer needs to be connected to
another
	>inductor or large voltage spikes can appear at the output. 
	>I've got a book with circuit diagrams (it's in dutch...) but i
never tried
	>one.
	>
	>Christophe

While it's well known that an *open* output can cause some damage on a tube
power amplifier, I nver heard of a constant load resistor instead of a
speaker
would cause any problems. Is this really true ? And if so, why ?

JH.