[Boatanchors] SB-220 in AM service

[jeremy-ca]

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



----- Original Message ----- 
From: "William Kipping" <ke7kk at earthlink.net>
To: "boatanchors" <boatanchors at mailman.qth.net>
Sent: Wednesday, March 12, 2008 3:03 PM
Subject: [Boatanchors] SB-220 in AM service


>
>
> 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
>
> _______________________________________________
>