Nice boards. Great idea on the LEDs. But really PRICY!
And Don I see you also subscribe to Rich's parasitic myths and how to cure
them. As well as the filament voltage "issues" which I believe are
overblown. I don’t like the grids not connected directly to ground the way
Eimac recommends them to be.
All of the TL-922s that I have put new tubes into had the tubes destroyed by
them shorting (which they do in all amplifiers, even ones with parasitic
mods) or gassey tubes.
In all my years, I have never seen a low output 3-500 tube from a ham
amplifier. Only damaged tubes either mechanically (plates falling off) or
eclectically.
73
Jim W7RY
-----Original Message-----
From: Don Kessler
Sent: Wednesday, October 28, 2015 7:03 PM
To: amps@contesting.com
Subject: Re: [Amps] Tl 922 mods
Please consider this as well:
http://kesslerengineeringllc.com/tl922.html
73,
Don
On 10/28/2015 06:16 PM, Alek Petkovic wrote:
Also see:
http://somis.org/
There's a wealth of good stuff on the TL-922 there.
http://www.pa0fri.com/
Click on Mods and then Kenwood TL-911 modifications. It actually describes
the TL-922.
73, Alek
VK6APK
*
*
On 29/10/2015 5:30 AM, Vic Rosenthal 4X6GP/K2VCO wrote:
W8ZR designed a sequencer board sold by Harbach which will protect your
relays, amplifier and transceiver. See <http://w8zr.net/QSK/index.htm>.
This is the best way. Whatever you do, you should read his QST article
that is linked there.
If you know that your transceivers provide enough time after asserting
key out and before producing RF, as well as a reasonable delay after RF
stops and before key out goes back to the receive state, then you can
just use a pair of vacuum relays or a vacuum relay and a reed relay to
replace the open frame relay in the TL922. Exactly how you do this will
depend on the coil voltage requirements of the relays that you use.
73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/
On 28 Oct 2015 23:04, Arnie Pfingst wrote:
I have a tl 922a with 10m amp driven by a Kenwood ts 940 or Yaesu ft
950 . It all works great except for the slow change over relay in the
amp. Im using the arb 704 interface for keying. I need a good mod for
the slow relay! After all this time I'm going to order the Harbach
soft start, and filter kit and will adjust the FIL voltage as needed.
Does anybody have any other ideas?ThanksArnie. Kd6cz
Sent via the Samsung Galaxy S®6 active, an AT&T 4G LTE smartphone
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