[Amps] re TL-922 --> 21st century

[Jim W7RY]

Vic..

 I have QSK and step start boards available. I also replaced the 
incandescent lamps with LEDs on the meters and the T/R indicators.

  See...

 http://www.w0lx.com/ccportals/TL922APage3/tabid/218/Default.aspx

For pictures also see:

http://s900.photobucket.com/albums/ac206/w7ry/QSK%20Modifications%20to%20my%20TL-922/


 Email me for prices.

 73 Jim W7RY

> --------------------------------------------------
> From: "Vic K2VCO" <k2vco.vic at gmail.com>
> Sent: Saturday, August 13, 2011 2:22 PM
> To: "Amps reflector" <amps at contesting.com>
> Subject: [Amps] TL-922 --> 21st century
>
>> I have a stock TL-922 that I want to update. I'm going to do the 
>> following:
>>
>> -- step start
>> -- vacuum relay QSK
>> -- automatic bias switching to cut off tubes when not keyed
>> -- check / adjust filament voltage
>> -- replace VHF choke in plate circuit with glitch resistor
>> -- improve bypassing of HV and filament power leads
>> -- no, I'm not doing anything to the parasitic suppressors except 
>> checking the resistors!
>>
>> A question:
>>
>> The grids are grounded via a parallel combination of 3 220 pf capacitors, 
>> a 4.7k resistor
>> and a 470 uh choke. I don't understand this. I am tempted to just strap 
>> the grids to
>> ground. What were they thinking?
>>
>> -- 
>> Vic, K2VCO
>> Fresno CA
>> http://www.qsl.net/k2vco/
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>