[Amps] Indirectly heated cathodes

[DF3KV]

For the YL105x family of tubes the manufacture suggests to heat it
permanently at 3.5V.
The nominal heater voltage is 3.8V.
The heater voltage of the 4CX10000D in the Racal amps in stand by is heated
at 6.9V.

73
Peter

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Roger D Johnson
Sent: Sonntag, 4. April 2010 00:25
To: amps at contesting.com
Subject: [Amps] Indirectly heated cathodes

One of the big disadvantages of the indirectly heated cathode is it's
warm-up time. has anyone experimented with using a lower "keep
alive" voltage to allow faster warm-up when full voltage is applied?
I remember the old TV sets where a diode was in series with the
filament supply and was shorted out when the set was turned on.
Is there an easy way to determine when the cathode is up to temp?

73, Roger

-- 
Remember the USS Liberty (AGTR-5)
http://ussliberty.org/ 

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