To: <amps@contesting.com>
>Date: Tue, 08 Apr 1997 18:26:58 -0500
>To: "David B. Ritchie" <dbr@alumni.caltech.edu>
>From: Phil Clements <philk5pc@connect.net>
>Subject: Re: [AMPS] Alpha/ETO
>
>At 02:25 PM 4/8/97 -0700, you wrote:
>>
>>Shoot -- and my Alpha 87A doesn't even HAVE a bandswitch. I guess I'm
>>screwed.
>>Dave N7UE
>
>Does this mean you have never been inside your amp to do an annual cleaning?
>Not good practice; ask any broadcast engineer about cleanliness.
>
>>> To produce those 77 series amps today would cost in excess of 10 grand!
>>> Two things separate amplifiers from the rest of the mickey mouse type.
>
>You might be surprised! 95% of all 77DX/SX parts are still available over the
>counter at the big parts suppliers. Had a couple of inches been added to the
>cabinet, cheaper stock relays, transformers, and filter cap could have
been used.
>The price of new 8877/YU-158's is now half of 1980 prices. The ETO markup
on the
>77DX/SX was in excess of 100%. Even at today's prices, these amps would
still be
>the cheapest, most powerful table-top amps in the world! (dollars/watt)
>
>>> 1. Bandswitch size and Pi-Network coils.
>
>Look in Bill Orr's Handbook to see what real 1500 watt tank circuits are
supposed
>to look like. The old Johnson Viking transmitters had bigger tank
components than
>many present-day units claiming legal-limit.
>
>>> 2. Weight of the plate transformer
>
>A good reliable continuous-duty power supply should weigh >100# and be
located off
>in a corner or closet somewhere and be forgotten about.
>
>
>(((73)))
>Phil, K5PC
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