[Amps] 572B - News?

[Louis Parascondola via Amps]

Nope the mod changed the low voltage supply to a tripled to up the cutoff bias voltage

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-----Original Message-----
From: Al Kozakiewicz <akozak at hourglass.com>
To: amps <amps at contesting.com>
Sent: Fri, Nov 7, 2014 01:56 PM
Subject: Re: [Amps] 572B - News?



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<pre style="font-size: 9pt;"><tt>Plus, if I recall, there was a service bulletin on the 2100 (not sure it it applied to the Z variant) regarding the use of the Svetlana tubes.  The amp needed a modification (probably to the parasitic suppression?) to use that tube.

Al
AB2ZY
________________________________________
From: Amps <<a href="mailto:amps-bounces at contesting.com">amps-bounces at contesting.com</a>> on behalf of Carl <<a href="mailto:km1h at jeremy.qozzy.com">km1h at jeremy.qozzy.com</a>>
Sent: Friday, November 7, 2014 1:03 PM
To: David Harmon; 'Marcelo Cabral'; <a href="mailto:amps at contesting.com">amps at contesting.com</a>
Subject: Re: [Amps] 572B - News?

The Svetlana works OK but has a smaller anode and less dissipation. They
havent been made in several years now.

Carl
KM1H


----- Original Message -----
From: "David Harmon" <<a href="mailto:k6xyz at sbcglobal.net">k6xyz at sbcglobal.net</a>>
To: "'Marcelo Cabral'" <<a href="mailto:py1kr.marcelo at gmail.com">py1kr.marcelo at gmail.com</a>>; <<a href="mailto:amps at contesting.com">amps at contesting.com</a>>
Sent: Friday, November 07, 2014 12:25 PM
Subject: Re: [Amps] 572B - News?


> Marcelo.....
> Try to find some 572-B made by Svetlana.......they are much better
> quality.
> I have had several sets of them and I prefer them over the Chinese mfgd
> tubes.
>
>
> 73
>
> David Harmon
> K6XYZ
> Sperry, OK
>
> -----Original Message-----
> From: Amps [<a href="mailto:amps-bounces at contesting.com?">mailto:amps-bounces at contesting.com</a>] On Behalf Of Marcelo
> Cabral
> Sent: Friday, November 7, 2014 11:18 AM
> To: <a href="mailto:amps at contesting.com">amps at contesting.com</a>
> Subject: Re: [Amps] 572B - News?
>
> Hi, Carl!
>
> Good news at the end!
> Sincerely, I will try a MP pair of these new tubes after January, but I
> haven't big expectations about their reliability.
> But, if them survive at least one year, I must be finished the others
> projects and be able for start this mod for GI7B. For today, I'll buy some
> GI7B's from UR4LL, must be useful in a near future.
> Thanks everyone, hope to meet everybody in CQWW CW soon.
>
> Marcelo - PY1KR
>
> -----Original Message-----
> From: Carl [<a href="mailto:km1h at jeremy.qozzy.com?">mailto:km1h at jeremy.qozzy.com</a>]
> Sent: sexta-feira, 7 de novembro de 2014 14:52
> To: Marcelo Cabral; <a href="mailto:amps at contesting.com">amps at contesting.com</a>
> Subject: Re: [Amps] 572B - News?
>
> RF Parts will be taking new 572B orders in Jan 2015, Id rather wait than
> hack up a perfectly good amp for an inferior tube.
> <a href="http://www.rfparts.com/tubes/tubes-572b.html" target="_blank">http://www.rfparts.com/tubes/tubes-572b.html</a>
>
> Carl
> KM1H
>
>
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</tt></pre>
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