[Boatanchors] SB-220 in AM service

[rbethman]

I have found the SAME results with an Amp Supply LK-500ZB, pair of 3-500Zs.

I've run a DX-60, TS-930SAT, AND HT-32 in at about 20/25W.  I don't 
believe EITHER of them uses chimneys.  The LK-500ZB uses a fairly high 
speed muffin fan across both tubes.

Haven't hurt the pair that came with the amp when I bought it about 8 or 
9 years ago.

Bob - N0DGN

jeremy-ca wrote:
> The SB-220 will work quite well at 300W out and not stress anything as 
> long as you dont do a 75M 1 hour monolouge.
>
> Ive run them that way for many years on all bands.
>
> Carl
> KM1H
>
>>
>>
>> Greetings Anchor People
>>
>> The Heath SB-220 in the shack is seldom used and I would like to use 
>> it in
>> AM linear mode with  low power exciters such as the Heath DX-60, Knight
>> T-60, HT-32 / 37, HX-500, WRL DSB-100 etc.  As its rated for 1KW CW RTTY
>> (10 Min max) I thought that 250W input on AM should not stress the power
>> supply or tubes, in the low power position (graphite tubes) At 60%
>> efficiency that should be approx. 150W rf output. Any thoughts from 
>> others
>> who have used the Amp on AM ?  Thanks for your input  Bill KE7KK SD
Bob Bethman/NØDGN/BC-610/Northern Radio 
SP-600 Manassas, VA - MultiBand Dipoles