From: "Allen (Marty) Martin" 
Subject: Re: [Drakelist] TR4-C low output


I found the problem!

I only have 108v primary voltage! Measured with a Tektronix dvm. Put the rig
on a variac with 120v and got 200w out on 80 meters.

Thanks for the tips
Marty

----- Original Message -----
From: "Garey Barrell" 
To: "Allen (Marty) Martin" ;

Sent: Monday, December 09, 2002 8:10 PM
Subject: Re: [Drakelist] TR4-C low output


>
> According to correspondence from Bill Frost, typical output power for
> TR-4Cw is 200W on 80 / 40 / 20, 175W on 15. and 150W on 10.
>
> The T-4 series typical output is 130W / 115W / 100W for same bands.
>
> These are single-tone or CW output powers.  TUNE mode reduces these levels
> somewhat because of series resistance inserted in the screen lead of the
> finals to limit off-resonance plate current.
>
> A fan to exhaust hot air away from the final compartment will extend the
> life of finals considerably, along with the life of other components in
the
> immediate area.
>
> Possibly the AC-4 filter caps have low ESR (dried out) and the HV is less
> than the 650 VDC it should be.
>
> Also, are you tuning for maximum output or just to a specified plate
> current?  If you are just going  by plate current, it is  _very_  possible
> that the meter shunt resistor has gone up in value and making your plate
> meter read higher than actual plate current.
>
> 73, Garey - K4OAH
> Atlanta
>
>
> At 09:13 PM 12/9/2002, Allen \(Marty\) Martin wrote:
> >I have a common problem with a couple or TR4-C rigs. I am only able to
get
> >about 150 watts out on 80-40-20 and 125 on 15 and 100 on 10. I am using
> >new Sylvania 6jb6's and a new driver etc. I have done the rf alignment
> >several times as well. The cathode and screen resistors seem to be right
> >at specs.
> >
> >Ideas?
> >
> >Thanks
> >Marty
>
>
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