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Re: [Amps] 756P3 + TL 922A

Subject: Re: [Amps] 756P3 + TL 922A
From: Vic K2VCO <>
Date: Mon, 19 Sep 2011 20:06:14 -0700
List-post: <">>
1) Vacuum relay (or similar) QSK is a necessity, even if you are an SSB 
operator who uses 
VOX or a CW operator who never uses full QSK. The 922 is /designed/ to 
hot-switch the t/r 
relay in those situations and this is probably the reason for many bandswitch 

2) Glitch resistor. I used 15 ohms 20w.

3) Ground the grids directly. I put a copper strap from each grid terminal to 
the nearest 
ground terminal. Mine is very stable on all bands. W8JI is very persuasive 
about this. I 
can get 1350 watts on most bands, and could get more with more drive, within 
the ratings 
of the 3-500Z's (this may be a bit much for the PS, so I don't normally push it 
this hard).

4) Check the filament voltage! Mine was 5.25V. I put a 15 ohm resistor in 
series with the 
filament transformer primary. I get about 4.95V now. This also reduces the 
voltage on the 
meter lamps a bit, making them last longer.

5) I added a soft-start. It may help protect the power switch.

I did NOT change the parasitic suppressors!

On 9/19/2011 12:52 PM, wrote:
> hello.... i am getting the 922a upgraded (mods) ...  other then the mods that 
> are most common.... is there anything else that i should get done to make her 
> run better...?
> Scott D
> "do you hear the dits"
> _______________________________________________
> Amps mailing list

Vic, K2VCO
Fresno CA
Amps mailing list

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