Actually, the screen grid current is often slightly negative when tuning up
with 20 watts. On rare occasions, when there is a bad mismatch with the
antenna and the amp (e.g. tuning up on wrong antenna), you get lots of
screen current. Also, light loading will cause a higher screen current.
While I occasionally see the overdrive LED come on for screen current, I
can't remember ever seeing the one for grid overdrive come one.
The Titan III is not an easy amp to tune, and it took me several months to
master it. The old dip the plate with the Tune capacitor, then increase
loading capacitor doesn't always work, especially on the higher bands.
I'm removing the case tomorrow to see if I can see/smell any problems, then
will probably remove the power transformer and box it up to send back to
TenTec ($80 round trip just for freight!)
Dave
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of John Molenda
Sent: Monday, April 25, 2011 11:50 AM
To: tentec@contesting.com
Subject: Re: [TenTec] Titan III - no grid drive
On 4/25/2011 10:17 AM, W3WW wrote:
> Dave,
>
> Do you have power output on 20 even though low or no grid current? I have
> had a similar situation with my Titan III. It seems to have little or no
> Grid current anywhere, but will put out full legal limit on all bands.
> Bought mine new and it has very few hours. I just learned to live with it.
I
> have also noticed when running low power (300-700W) it is hard to
eliminate
> any negative Grid current.
>
> 73,
> Don W3WW
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
Hi Dave, My Titan III does the same thing ( when it seems to be properly
tuned the meter on the right reads just about zero ) are we tuning them
right ? is there something wrong ? mine will easly put out full power
and that meter will read next to zero on most bands . John Molenda kb2huk
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