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Re: [Amps] Soft 572b's

To: "Shack" <noddy1211@sbcglobal.net>, <amps@contesting.com>
Subject: Re: [Amps] Soft 572b's
From: "Roger" <sub1@rogerhalstead.com>
Date: Thu, 22 Nov 2007 00:59:23 -0500
List-post: <mailto:amps@contesting.com>



> When you say Mod, do you mean removing the FL-1 board or whatever it is
> called?  If the board has been removed you also have to a mod to the band
> switch as well.  Sorry to be vague as it has been years since I did this.

IIRC (It was a while back) The only thing I had to do to mine to go on 10 
was the band switch mod.
No other changes. Same for the DTR-2000 and MLA-2500. I don't remember any 
filter change.

Roger (K8RI)
>
> I have the paperwork for this someplace, if it becomes an issue and you
> don't have it let me know and I will search it out.
>
> Mike K6BR
>
> -----Original Message-----
>
> Hello All
>
> I have a Dentron Clipperton L with the original ( and very soft)
> 572b's in it. I have found that the filament voltage at the tube
> sockets is 7.49 volts!! I have remedied that problem as well as
> removing the CB mods and restoring all to original. With the tubes in
> it the amp will now make about 300-350 watts on all bands and the
> power supply is in fine shape.
>
> My question is that the amp tunes up fine on all frequencies
> ( including WARC) up to about 26 MHZ but will not amplify 10 meter
> frequencies at all. The amp does have the 10 meter mod and I have
> changed the coil tap back to the 10 meter position. Is it possible
> that the soft tubes might be the culprit? I see tha 572b's are only
> rated to 30 mhz so 10 meters is right near max frequency/
> Any help will be greatly appreciated. I just wanted to get this
> resolved before re-tubing.
> Tnx es 73
> Kent
> N8ZRD
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