As I have always heard, this is not a legal limit amp so 700 watts out on CW
and 1000 on SSB would be about right I would think.
Are they consistently doing more than that? The few I've had through the
shop here may have been a bit higher but not by much. All fully unmodified
of course.
Cecil
K5DL
----- Original Message -----
From: "Tom Prohigh" <tomp@prohigh.com>
To: "Carl" <km1h@jeremy.mv.com>
Cc: <amps@contesting.com>
Sent: Friday, February 12, 2010 9:34 AM
Subject: Re: [Amps] TL-922 voltage / bias
> There are 2 tubes in the TL-922. The grids are DIRECTLY connected to
> ground, I removed the caps and chokes and also put in a second ground wire
> from VC1. This eliminated some arcing/parasitics I was having. The tubes
> are original Eimac 3-500Z not 3-500ZG. The color on the plates is fine,
> no
> color at idle and red/orange at full drive. I do get about 600-700W out
> on
> CW, but only about 1000 key down on SSB on 20M. 80M is somewhat higher
>
> Tom - AB3FL
>
> On Fri, Feb 12, 2010 at 10:30 AM, Carl <km1h@jeremy.mv.com> wrote:
>
>> That idle current is fine for 1 tube and the voltage drop is excessive.
>> Start by measuring the grid chokes for an open or looking for color on
>> both
>> plates.
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message ----- From: "Tom Prohigh" <tomp@prohigh.com>
>> To: <amps@contesting.com>
>> Sent: Friday, February 12, 2010 9:47 AM
>>
>> Subject: [Amps] TL-922 voltage / bias
>>
>>
>> I have recently aquired a TL-922. It is on a stiff 240V line which
>>> actually
>>> measures 245V. No load voltage on CW is 2200 and on SSB is 3100. Under
>>> full load the CW drops to 1900V @ 600ma and the SSB drops to 2400V @
>>> 800ma.
>>> Is there really suppose to be this much drop? It has the original 200uf
>>> caps in it and I was thinking about replacing them with 560uf units.
>>> Also
>>> the grid bias on CW is 60ma and on SSB 120ma which seems a little low.
>>>
>>>
>>> thanks
>>>
>>> Tom - AB3FL
>>> _______________________________________________
>>> Amps mailing list
>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>
>>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|