[TMC] PRogress report No. 3?

[telegrapher at att.net]

Well the only way to put HV on them in the transmitter anyway is to 
apply High B+ like your going to operate the rig.  I don't suppose it 
would make any difference.  The transmitter was designed for 24/7 duty 
so how do i as a ham with maybe once a week operation treat them?  Is a 
15 minute warm-up time adequate and will just applying primary power for 
the filaments be considered adequate for the warm-up period?  I don't 
want the transmitter setting here running 24/7 when i'm not even going 
to be around it for periods of time.  besides electricity here isn't cheap.

Larry
W0OGH


Mark Foltarz wrote:

> 
>>872A's, and their more common cousin, the 866A, can be unpredictable. In my 
>>early experiences with a TMC GPT-750, the HV breaker would pop often and 
>>more or less predictably until the 872's had "cooked" for quite a long time.
>>
> 
> 
> 
> Yes they can be!  I had fits with a home brew supply using 866's.  Went through
> a bunch of them. Never could get more than a few hundred MA. And the darn thing
> was never reliable on start up - blew fuses left and right.I swithed to 3B28s
> and the probems went away.
> 
> Is there a more modern eq. of a 872?
> 
> Mark
> 
> 
> 
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