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Re: [Amps] AL1200 on AM - max carrier?

To: "Tony Brock-Fisher" <>, <>
Subject: Re: [Amps] AL1200 on AM - max carrier?
From: "Carl" <>
Date: Thu, 30 Oct 2014 10:42:54 -0400
List-post: <">>
The usual rule of thumb is to run the AM carrier at 24% of the tubes anode dissipation.
Figure on an average of 50% efficiency at full DSB AM PEP.

Tune up as you normally would for 1500W and keep the drive as low as possible, about 20-25W should be fine with a fairly high gain tube. Thats all I need for a 350-400W carrier with the LK-500ZC and the external Dahl transformer option runs comfortable even after hours of use, OTOH Im not into old buzzard monologues. It weighs about 14# more than the far from CCS Ameritron iron which even needs to run less power in RTTY contests.

The CW position would be fine but the only reason being the bias is more which reduces the idle current, there IS NO plate voltage change. Id be sure the output remains linear with that bias. Ive changed bias on many amps to reduce the wasted heat and with the AL-1200 there were 3 different tubes used and I havent tried them all.


----- Original Message ----- From: "Tony Brock-Fisher via Amps" <>
To: <>
Sent: Thursday, October 30, 2014 7:13 AM
Subject: [Amps] AL1200 on AM - max carrier?

I want to run my AL-1200 on AM for a short stint (2 hours operating time, 50% overall duty cycle). I have tested it at about 225 watts carrier output, and with moderately high duty cycle transmissions (known in the AM crowd as 'Old Buzzarding'), it gets quite hot.

What is the max recommended AM carrier power for long-winded transmissions?

Also, I'm assuming it should be tuned up for proper operation at double the carrier power.

 I searched the list finding no real answers.


Tony, K1KP
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