Re: [Amps] 200-ohm tank and "un-un" in HF amp design?

["Carl" <km1h@jeremy.mv.com>]

All 3 of the Command Tech amps 1/2/3 tubes used a single toroid switched for 
40, 80, and 160 followed by the balun. It was the switched pi net toroid 
that caused problems.
On the 6M amp they also use a balun.

When Palstar bought the line they went to 3 seperate toroids and kept the 
balun.
Ive worked on several of all models from both companies and havent had a 
balun problem but none were used for RTTY that Im aware of.
Carl
KM1H


----- Original Message ----- 
From: "Louis Parascondola" <gudguyham@aol.com>
To: <dezrat1242@yahoo.com>; <amps@contesting.com>
Sent: Sunday, October 20, 2013 7:01 PM
Subject: Re: [Amps] 200-ohm tank and "un-un" in HF amp design?


> That I don't know, I'll try to see what the manual claims.
>
>
> Will that unit run at full legal limit with a brick on the key? The 
> 2-holer
> version will not, and the weak link is the toroid.
>
> Guess how I know?   Twice.   :-)
>
>
>
>
>
>
> -----Original Message-----
> From: Bill Turner <dezrat1242@yahoo.com>
> To: Amps <amps@contesting.com>
> Sent: Sun, Oct 20, 2013 6:59 pm
> Subject: Re: [Amps] 200-ohm tank and "un-un" in HF amp design?
>
>
> ORIGINAL MESSAGE:          (may be snipped)
>
> On Sun, 20 Oct 2013 18:39:37 -0400 (EDT), Louis wrote:
>
> > THE COMMAND TECH HF-2500E THAT RUNS 3 3CX800 TUBES USES THIS UN-UN SYSTEM 
> > AND
> AT 3KW OUTPUT THERE SEEMS TO BE NO ISSUES WHATSOEVER.   Seems to be a 
> tried and
> true design.  It's hard to argue with success like that.
> >
> REPLY:
>
> Will that unit run at full legal limit with a brick on the key? The 
> 2-holer
> version will not, and the weak link is the toroid.
>
> Guess how I know?   Twice.   :-)
>
> 73, Bill W6WRT
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