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IIRC, the 3-500Z tube can be fed with up to 4k volts and put out 'mo powa'. SO, the weak link is the power supply. The Swan Mk II amp I have has two 3-500Z tubes in it with a transformer that will put out close to 3.6kv (a 'Peter Dahl' xformer) and ~1.7kw. The stock xformer would only do ~2.8kv and put out ~1.3kw. If you are getting a kw with the xformer/supply that you have now and you paid so little for it all; then you are ahead of the game . . .

[QUOTE="Robb, post: 394918, member: 8446"] IIRC, the 3-500Z tube can be fed with up to 4k volts and put out 'mo powa'. SO, the weak link is the power supply. The Swan Mk II amp I have has two 3-500Z tubes in it with a transformer that will put out close to 3.6kv (a 'Peter Dahl' xformer) and ~1.7kw. The stock xformer would only do ~2.8kv and put out ~1.3kw. If you are getting a kw with the xformer/supply that you have now and you paid so little for it all; then you are ahead of the game . . . [/QUOTE]

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