From: Garey Barrell 
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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