[BC] Interesting phenomenon

[donroden at hiwaay.net]

I don't know Cowboy......

Today, I brought the screen back up to normal.

Transmitter will make 110% at 6.7 vac on filament ( 7.0 spec )

Haven't seen any strange screen fluctuations since the tube " reformed".

Time will tell.

I just posted this because I wanted everyone to be aware that running  
without screen "on this HT-7.5"  "seemed" to be killing the emission  
on the 4CX7500.

I could still have a bad tube or something external to the tube...

So far, I don't see anything external.

Don Roden

Quoting Cowboy <curt at cwf1.com>:

> On Friday 08 June 2012 11:12:00 pm donroden at hiwaay.net wrote:
>> Did an element in the tube get "poisoned" by running the transmitter
>> with no screen voltage ?
>
>  No.
>  You can safely run forever with zero screen voltage.
>  Effectively, a low gain triode.
>
>  I'd be looking for something in the plate circuit, myself.
>
> --
> Cowboy
>
>