[Amps] 2010 Handbook

[N1BUG]

The band switching scheme never arced and worked fine except for 
being a little confusing at 0200 local time! As I recall it was A 
(tune) and A (load) for 40, A+B and B for 80, A+B+C and A+C for 
160... or something like that. You may have heard that amplifier 
Gerald. I used it on 14.345 / EME Net for years.

Your scheme sounds much simpler to operate.

The only thing that arced in that amp was the plate choke. It was 
wound on a ceramic tube salvaged from a defunct 200 watt wire wound 
resistor. It seems the inside of it was painted or coated with 
something that conducted RF quite well. Eventually I was able to 
clean all that out, and the plate choke is still in use today, in a 
different amp.

73
Paul N1BUG




TexasRF at aol.com wrote:
> Now that band switching scheme shows some real innovation! I bet it 
> never arced did it?
>  
> I once built an amplifier that used a plexiglas disc/cam that pushed 
> on scavenged relay leaf/contacts in a similar manner, one cam per 
> contact. Ugly but worked well. Allowed switching cap A, cap B, cap A+B 
> and so on. Your screw driven switches would do that also of coarse.
>  
> 73,
> Gerald K5GW