Hello to all,
In the course of helping a past request for the maual and circuit diagram
for the Dentron GLA-1000, I've stirred up quite a nice small following of
folks with this amplifier in various states of condition/operation.
One of my past posts mentioned the lack of replacement sweep tubes at a
realistic price, some serious design flaws with the GLA-1000x and that I
at one time set about to author an article for QST with the various
improvements possible. Since the amplifier fell out of popularity with
amateur community, I never completed the article but did complete the
modifications to my own amplifier.
I have received renewed requests for the "update" information I once
wrote, a nice quad set of Svetlana EL-509 sweep tubes which should
"retrofit" quite nicely and have two "virgin" GLA-1000B amplifiers in
original condition.
I will once again start the "update mods" and tube retrofit using one of
the two amplifiers with a QST ariticle as the eventual goal. I would
like to throw out a request to have anyone with practical thoughts/ideas
for the Dentron GLA-1000x circuit to please offer their opinions and
ideas.
As I update different sections of the amplifier, I'll be posting the
various short problems related and would hope to have your thoughts.
These would include:
Better efficiency above 21MHz
Installation of a standby mode, current cuttoff/reduction circuit.
Reducing the VHF gain/ parasitic reduction, design of suppressor
circuit(s).
Conversion from the original 6JE6/6LQ6 to the Svetlana EL-509
considerations.
Any other related issues.
I have copies avail of the GLA-1000 circuit and the EL-509 information is
on the Svetlana web page. I'll try and keep this short and simple. I
would hope to minimize any errors before the submission of the article to
the ARRL. Thanks to those who have already offered to help with the
project.
Cheers
Skip May wv6f
nospam4me@juno.com
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