Hi Ron:
Well the analogy to solid state is that of a diode to a transistor, or
more accurately a FET.
The addition of a third element to a vacuum tube diode turns it into a
triode. The control grid creates the leveraged control element which
enables current control via a very small signal
Sorry for posting my replay to the wrong subject and recipient.
It was a fat finger mistake. Was very interested in the L-4B article
and was typing faster than thinking. Happens more and more these days!
Again, apologies for the misdirected response..
Here is the correct response routing
I looked at this “conversion” and can’t imagine doing something like this to a
L-4B. The excuse is the power supplies are hard to find and parts go bad in
the old amp supplies. Then, the guy uses a Heathkit transformer which is just
as old as a Drake transformer. To fit it in the RF deck, he
Amen, Lee,
I was thinking of a similar response but I didn't want to be the one who
started the fire. What he basically has now is an L75. Mine works great and
if I want a minimally stronger signal plus more heat in the shack and a
higher power bill, I have an L-4B and an L-7 to play
On Mon, May 2, 2011 at 1:54 PM, w4...@aol.com wrote:
I was thinking of a similar response but I didn't want to be the one who
started the fire.
I tend to agree, I wouldn't want to do that to an L-4 either, but as 'HFN
says The theme of this article presents *one* possibility in giving the
I personally think Ron did a great job on the article. For the builder or
tech person this is a great project and as far as I am concerned I would
rather have a table top amp using a 3-500Z than amps using the old sweep
tubes 572's or 811's. This conversion is not for everyone, but Ron Baker is
All, Thanks for all your comments.I think I should comment that I was not
suggesting for anyone to rebuild an L4B amplifier working or otherwise in this
manner. This particular project was just a dream of mine for many years,
probably more of a challenge to prove it could be done.
I am looking into the filters on my R4C. I have 2 Heath Dynamics filters mounted in the radio. Can anyone tell me the history of these filters and the original use?ThanksTerry
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Terry -
The manufacturer is 'Heath Dynamics' no relation to Heathkit. They
were one of several companies to make filters for the R-4C. A couple of
the others were Piezo Technology and Network Sciences, plus the latest
receivers had a Japanese made filter.
73, Garey - K4OAH
Glen Allen, VA
On Mon, 2 May 2011 14:58:47 -0400, Bill Scott wrote:
Personally I want to thank Ron for providing a fantastic website, very
interesting articles and helpful upgrades to our Drake equipment. Also for
the tech support if someone needs help. Keep up the good work Ron and don't
let anyone stop
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