[Amps] Looking for info: SRF7053 device

[Steve Thompson]

John D'Ausilio wrote:
> I've got a flaky 903 amp, with a series of devices starting with
> SRF7058, then SRF7059, then SRF7053. Only ref I've been able to find
> is that the 7053 is a 100w FET device, but I'm not sure I believe that
> :)
> 
> No manufacturers marks evident .. anyone know for sure what they are
> and/or have datasheets?
Tracing the circuit - especially any bias circuits - should help 
identify FET from bipolar.

If the amp has a model number, you might be able to find marketing blurb 
which might say what device technology is used. Can you get a date 
estimate from the codes on any of the components - you can check how 
that ties in with when Motorola introduced their 1GHz FETs.

Steve