In a message dated 1/14/05 11:16:27 AM Central Standard Time,
craxd1@ezwv.com writes:
I want to build a new small amplifier for those times when I really don't
> want to heat up the shack with the 5CX1500A. I have a supply of 4CX300's
> and sockets as well as 4CX250's and sockets. I plan to use two in
> parallel.
> Is there anything to recommend one over the other?
>
> David C. Hallam
> KC2JD
Dave,
The 4CX300's, (especially the 300Y's with their actual 400 watt plate
dissipation), utilize twist lock shakeproof sockets that provide better anode
cooling. The 4CX250's have a 250 watt plate dissipation but the sockets for
the
250's are much cheaper and more readily available.
Since very few folks have, or can afford to purchase, the twist lock
sockets for the 300/400's, the new tubes available at the Hamfests and at other
surplus sources are usually much cheaper, or at most no more expensive, than
the
250's.
If you plan on building an amplifier head unit that you would share between
base and mobile power supplies, the 4CX300 would again be the obvious choice
because it would hold up to any road vibration much better than the 4CX250.
If it was me, the choice would depend mostly, if not entirely, on if I
already owned some good sockets for the 4CX300's or not.
Regards,
Dennis O.
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