[Amps] Tl 922 mods
w7ry at centurytel.net
Thu Oct 29 00:32:05 EDT 2015
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
From: Don Kessler
Sent: Wednesday, October 28, 2015 7:03 PM
To: amps at contesting.com
Subject: Re: [Amps] Tl 922 mods
Please consider this as well:
On 10/28/2015 06:16 PM, Alek Petkovic wrote:
> Also see:
> There's a wealth of good stuff on the TL-922 there.
> Click on Mods and then Kenwood TL-911 modifications. It actually describes
> the TL-922.
> 73, Alek
> 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.
>> Vic, 4X6GP/K2VCO
>> Rehovot, Israel
>> 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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