Thanks, Carl.
Fan noise I can probably handle - location and acoustical isolation from
the operating desk should help.
I just may give the AL-1500 a try. If that works out I should rebuild
the blower in my last working Alpha 77, then sell it and the 2-hole 76A
to lighten up the desk. The outside exhaust system for the YC-156 may be
finished by then, if so that will be the primary station amp and
everybody's happy.
My wife has this thing she swings in front of my face (a shiny bit on a
string, or was it her fist?) - "No more boat anchors... No more boat
anchors..." ;-)
73,
Jim N7CXI
On 12/29/2011 7:06 PM, Carl wrote:
> Move the fan speed tap to fast and it will be fine, that amp is used
> by many RTTY contesters where they just complain about fan noise.....
>
> Heck, Ive been using a LK-500 with the optional external transformer
> at 350W carrier with no issues when driving with a TS-950SD. When I
> need QRO I have a couple of healthy Class C amps in another part of
> the basement along with boatanchor RX and TX's.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- From: "Jim Barber" <audioguy@q.com>
> To: <Amps@contesting.com>
> Sent: Wednesday, December 28, 2011 9:54 PM
> Subject: [Amps] AL-1500 for legal-limit 160m AM?
>
>
>> I'm considering an AL-1500 as a backup amp, tilted to favor 160m AM
>> operation.
>> They are (relatively) inexpensive to buy, and I've cached up enough new
>> and like-new 8877's to last a long, long time with decent treatment.
>>
>> My question is if anyone here has been successful long-term running an
>> AL-1500 at or near the legal limit on 160m AM? To be explicitly clear,
>> I'm talking about running 375 watts carrier and 1500 watts PEP modulated
>> output, with key-down times that (in my case at least) *can* go two to
>> three minutes, generally with breaks at least that long and usually
>> longer between transmissions.
>>
>> So - do you think the overall power supply, the tank circuit, plate
>> choke, cooling etc are up to the task? Even things like underrated parts
>> in the tuned input can be more of an issue with full-power AM than SSB.
>>
>> Opinions solicited and TIA,
>> Jim, N7CXI
>>
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>>
>>
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>
>
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