>I'm partial against the 572b tube, had some very bad luck with two sets of
>Svetlana's.
*** Peter -- Svetlana 572Bs reportedly have more VHF gain than other
brands.
-- Tetrodes with both grids grounded have very little anode-cathode
feedback-C, which should make them more stable than a similar-size triode
in g-g service.
>I finally converted my old FL2000B to use a single QB4/1100
>instead. Although a tetrode, I run it as a triode with screen and grid tied
>together, acting almost identical to the 3-500Z, the result is a much more
>tractable and stable amplifier, with better output on the higher bands.
>I find the 572b a very expensive, tricky and fragile tube, and recommend
>against it. Your mileage may vary..
>
>Vy 73 de OZ1PIF, Peter
>
>********** OZ1PIF **************
>email: oz1pif(no-spam-filler)@get2net.dk
>http://hjem.get2net.dk/oz1pif
>Ph. +45 4619 3239
>Snailmail:
>Peter Frenning
>Ternevej 23
>DK-4130 Viby Sj.
>Denmark
>***********************************
>----- Original Message -----
>From: <jsb@digistar.com>
>To: <amps@contesting.com>
>Sent: Monday, October 20, 2003 6:22 PM
>Subject: [Amps] Ameritron AL-572B
>
>
>>
>> I'm on the trail of getting an Ameritron AL-572B - new, from the
>> HamStation.
>>
>>
>> Just wondering if anyone had any recommendations against getting this amp.
>> I have thought about the 3-500Z AL-80B but haven't found a better reason
>> to get the AL-80B instead.
>>
>>
>> The AL-572B meets the price point i'm wanting - 1300 watts for a dollar a
>> watt.
>>
>> But i'm very open to suggestions and opinions about the 3-500Z and
>> 3CX800A7 products they sell. I'd like to keep the pricetag under $1300
>> though.
>>
>>
>>
>> regards,
>> Jason
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>
>
>
>
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>
- R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org
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