[Amps] 2010 Handbook

[N1BUG]

That's true Gerald. :-)

The 1/2 inch wide brass "U" clips on the grid, cathode, and filament 
were quick enough, but the 6 screws for the clamp plates to hold the 
tube in place (by means of clamping its screen to the chassis) took 
most of the time!

Band switching could take almost as long, with lots of little knobs 
which drove screws, which pushed flexible fingers of aluminum (!) 
against contacts on the tune and load padder capacitors, thereby 
grounding one side of them. This in various combinations was 
required on 40, 80, and 160 due to the way-too-small air variables used.

Those were the days! Uh..... or not!

73,
Paul


TexasRF at aol.com wrote:
> Well Paul, if you used alligator clips for the tube connections you 
> could change the tube in half the time!
>  
> 73,
> Gerald K5GW
>  
>  
> In a message dated 11/17/2010 5:19:00 A.M. Central Standard Time, 
> paul at n1bug.com writes:
> 
>     Roger (sub1) wrote:
>      >> 4CX1000A?
>      >
>      > 4.    It uses an oddball socket
> 
>     I once built a successful 160-10m amp around a 4CX1000A with no
>     socket at all. OK, it took 10 minutes to change out the tube, but
>     you rarely if ever have to replace one.
> 
>      >          Maximum frequency for full power is only 110 MHz, but I
>     believe
>      > it will operate at 144-147 MHz at reduced ratings and a pair in
>     PP will
>      > easily run more than the legal limit.
> 
>     I ran a single 4CX1000A at legal limit on 144 MHz for years, never
>     had any issue at all with it. These tubes have also been used at 222
>     MHz, though one doesn't see that too often.
> 
>     73
>     -- 
>     Paul, N1BUG
>     Aurora Sentry: http://www.aurorasentry.com
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-- 
Paul, N1BUG
Aurora Sentry: http://www.aurorasentry.com
Piscataquis ARC: http://www.k1pq.org
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