[AMPS] info on tubes required

[John Fielding]

A friend has been offered some replacement tubes for his HB amp.  The amp runs two 3-500Z
but recently one has developed a problem.  He has been offered two new tubes but these
are 3-750Z.  I have never heard of these and can't find any reference to them in the
various web sites and data books at my disposal.

Anyone know about this animal, heater same as 3-500Z?

John	ZS5JF

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