Thanks to all who responded to my query. It seems the tubes may be TB3/750
which are
similar to the 3-500Z.
I have passed on the info to the ham concerned. Once again tks.
John ZS5JF
----------
> From: John Fielding <johnf@futurenet.co.za>
> To: amps@contesting.com
> Subject: [AMPS] info on tubes required
To: <amps@contesting.com>
> Date: 26 August 1999 05:54
>
>
> 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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