[Amps] 3CX1000A7

[Joe Crawford]

Thanks to all who responded per the 3CX1000A7. I will be looking into 
putting this tube on that air!
                             Joe W4AAB 

 


W0UN -- John Brosnahan writes: 

> 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 
> 
> 
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