[Amps] Prepare GU74B

[Harold Mandel]

Kees,

Did you mean to say "no RF Drive?"

And NOT say, "No RF Load?"

Hal
W4HBM

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Kees - pa7two
Sent: Tuesday, February 20, 2007 5:20 PM
To: zl2aaa at paradise.net.nz; amps at contesting.com
Subject: [Amps] Prepare GU74B


Hi OM Morrie. 
 
Time for a serious answer:
 
Connect only the fillament for 6 hours or so and use household blower to
cool the tube. Check with hot and cold fillaments for shorts.
Then connect the tube into the amplifier, raise the anode voltage by 25%
every 4 hours till maximum. NOTE: gassy tubes will flash over!
After that push the PTT but no RF load for 15 minutes, followed by a 15
minutes cool down. Repeat. After that adust the IDLE current. 
Play at half power the first 4 hours. After that try full load.
 
I hope this helps, 
 
73, de Kees - pa7two 
 
 
 
In a message dated 2/20/2007 4:22:22 P.M. Eastern Standard Time,
zl2aaa at paradise.net.nz writes: Hi All.  What is the best way to prepare a
GU74B which has not been used forwho  knows how long for use in a amp.Tnx
Morrie   Saute in olive oil and garlic until brown, add salt and pepper to
taste.  Smoother with onions and serve with a garnish of parsley.
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