[Amps] Anyone build a GU5B?

[Tom Rauch]

> Looks almost identical to the FTL3-1 RF heater-generator 
> tube by BBC.
> The 80m monoband amp I built in the 70s with it had very 
> poor 3rd order IMD,
> about -18db!
> Still good for CW and FSK, but not for SSB in the DX 
> window


I almost hate to ask a simple question on this reflector, 
but was that dB PEP or dB below one tone of the two??

That's terrible IM. I'd never use something like that.

Are you sure it was similar to the GU5B?

73 Tom