-
re: Input xmfr ratios.
-
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.
-
2:25 Doesn't make much sense with AB1
operation.
-
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)
-
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.
-
skipp
-
[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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