Re: [TCML] Tube coils structure

[Ed Phillips <evp@xxxxxxxxxxx>]

   There's absolutely nothing wrong with paralleled power tubes and in 
"the early days of wireless" it was common practice to parallel plenty 
of them, in one extreme example about 500 as I recall.  However, you 
have to be careful to avoid parasitic VHF oscillations.  I agree about 
"all the eggs in one basket" and would never think of having a single 
[or even two] tubes at the start of an experiment.  Stuff happens even 
if you're careful although tubes are far more rugged than solid state 
devices, which expire without a sound.  I think 4 833A's in PP parallel 
would be a very good design.

Ed

Jim Mora wrote:

> Hi All,
>
>
>
> It has been recently stated that one serious transmitter tube is better than
> multiple lesser tubes say (4) 833a's. I can see the benefits but then again
> all eggs are in one basket. Has anyone built a push pull quad 833a coil? The
> plate transformer becomes an issue; but, a 5+kv pig should easily do. What
> say you? Should I look for a mongo transmitter triode (which I thought a
> 833a was). I have 40 amps worth of 10volt filament transformers.
>
>
>
> This is down the line for me, though I'm curious what the collective list
> thinks.
>
>
>
> Thanks,
>
> Jim Mora


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