On Fri, 15 Jan 1999 22:00:04 -0500 "pmarkham" <pmarkham@newsguy.com>
writes:
>
>From: km1h@juno.com
>To: amps@contesting.com
>Date sent: Fri, 15 Jan 1999 16:13:42 -0500
>Subject: Re: [AMPS] Re: Alpha 76CA tube swap
>
>What am I missing by using the "as designed" filament circuitry of the
>Alpha
>76ca?
If there is a url for details on the www?
Just what the world needs is another web page!
Everytime u key the amp the filament voltage changes at roughly the same
percentage as the HV since both windings are on the same xfmr. The 8874
filament spec is +/- 5% and I would prefer -2.5% +/- 1% for maximum
life.
73 Carl KM1H
>
> TIA, Pete/wa4hei
>
>> A similar circuit is suggested even for the stock 8874's plus
>Dentron
>> DTR2000L, MLA2500 and other amps that use expensive indirected
>heated
>> tubes where voltage control is an issue.
>>
>
>
>
>
> The meek will not inherit the Earth.
>
>--
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>Search: http://www.contesting.com/km9p/search.htm
>
>
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