[AMPS] xmfr ratios

[nospam4me@juno.com]

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re: Input xmfr ratios. 
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Just to throw it out...  one could use an 
xmfr with other ratios.  The 4CX1500B works 
great/better in AB1 apps.  If a low drive exciter is 
used, 9:1 works pretty well.  For some reason, 
one could also use a 2:25 to 1 ratio.  
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2:25 Doesn't make much sense with AB1 
operation. 
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For classic 100 plus Amateur Transceivers, one 
would probably set up and use the 12.5 ohms 
value with the belief it's application gives a measure 
of added stability.  (no pun intended) 
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Be careful of the extremely low grid diss, it 
doesn't take much to make it go away. After 
long idle periods, I've found at least a 20 min 
warm up helps.  I've got a diagram of the tube 
in an FM broadcast xmtr going up on sonic 
soon. 
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skipp
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[snip]
From: measures <2@vc.net>
To: <n4kw@citrus.infi.net>, Subject: Re: [AMPS] 4CX1500B
€  If one uses the Eimac recommended I-limiting shunt type 
screen-regulator, a glitch R in the B+, and adjusts the grid bias V so 
that no more than c. 100uA of grid-I flows under max. drive, there is 
little chance of damage.  An  appropriate grid termination is either 
50-ohms or 12.5-ohms, depending on how much drive is available.  With 
12.5-ohms, a bifilar broadband 4 to 1 xfmr. is needed.  
cheers

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