[Amps] Alpha &&DX Conversion

[Joe Subich, W4TV]

Yup, I had another one ... a McMartin with an 8877.  2300W output on
104.9 just outside Columbus, OH while I was in school and my first
job out of college.

73,

    ... Joe, W4TV


On 9/5/2012 10:37 PM, Jim W7RY wrote:
> Yup! Mee too.
>
> I worked on a BEXT 2500 watt transmitter with an 8877. My transmitter
> was limited to 2200 watts output because of licensing. 24 hours a day!
> As I remember about 65 or 70 watts from the exciter. Plate voltage was
> 4100 V under load.
>
> 73
> Jim W7RY
>
>
> -----Original Message----- From: Paul Christensen
> Sent: Wednesday, September 05, 2012 2:48 PM
> To: amps at contesting.com
> Subject: Re: [Amps] Alpha &&DX Conversion
>
>> "I will tell you why i run a 2 tuber, you put in 25 watts in and do
>> 1500 easy not push a one tuber to do 1500 out. it all comes down to
>> what you can afford. bill 73"
>
> This may be an interesting point of reference.  During my college years,
> I worked at a 3KW FM station in Rockford, IL as its chief engineer.  The
> transmitter was an AEL FM-2.5K (FCC type accepted to 2.5KW output) and
> used a single 8877 to produce 2500-watts output at 104.9 MHz.  All day
> long, every day, 365 days a year.   A three-bay circularly polarized
> antenna brought ERP to 3KW.
>
> If a 77Dx is running intermittent amateur-class service but under high
> duty-cycle modes like RTTY at 1500-watts output (the U.S. legal limit,
> for example), I think its reasonable to assume that a 8877 is already
> operating with sufficient headroom of roughly 1KW.   For what purpose do
> any of us need more than 1KW of headroom from our vacuum tubes when
> producing 1.5KW?
>
> Paul, W9AC
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