[Amps] 3CX1000A7

[W0UN -- John Brosnahan]

At 07:12 AM 1/16/2005, Roger D Johnson wrote:
>W0UN -- John Brosnahan wrote:
>
>>Biggest problem is that it is a filament HOG.    5 volts at 30 amps.
>
>But it's virtually instant warmup! No waiting an agonizing
>three minutes!
>
>73, Roger

On the other hand it has a more expensive/rare socket than an 8877.
But the tubes are typically cheaper on the surplus market when you can find
them.  Used by a number of companies for RF heating.  Finding sockets
may be a bit more problematic although a 4CX1000 socket could probably
be made to work.

If I still had some I would put them on the air.  But I have 8877s
instead.  Long warmup but the watt-hour meter does not spin
quite as fast when I am just tuning the bands.  While you COULD
turn the 3CX1000A7 OFF and ON a lot, this is generally not regarded as
good design practice.

As I said, it is an OK tube, and if the price is right it will make a good
HF/low VHF amp.  For instant on I like the 3CX1200A7 at HF and
the 3CX1200Z7 on 6M.

73--John  W0UN