[AMRadio] AM Usage with Linear AMPS

Brett gazdzinski Brett.gazdzinski at mci.com
Mon Nov 22 08:29:05 EST 2004

How many 811a's in that amp?

If 4, then I think the 811a has 65 watts of plate dissipation, 4x65=260.
Cut 260 watts in half for 130 watts of carrier output, but I doubt I would
run them
that hard. The power supply likely wont take that much abuse, its designed
ssb service, very low duty cycle!

Figure maybe 100 watts out, but watch things closely.

You could likely pop in 572b tubes, 160 watts of plate dissipation, for a
of 640 watts of dissipation, 320 watts carrier output, but the amp would
support that, the power supply will just laugh at you.

Four 811a's in plate modulated service at 1500 volts would give
you 500 watts of carrier out all day long.

Two 811a's in push pull class C do 250 to 300 watts of carrier......

Going from 25 to 100 watts is a help, but be careful with the amp....


-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Ralph Daniels
Sent: Monday, November 22, 2004 7:55 AM
To: amradio at mailman.qth.net
Subject: [AMRadio] AM Usage with Linear AMPS

Hi all,

I feel this subject must have been covered many times but I just can't find

Specifically, I have a Heathkit HX-10 Marauder driving an Ameritron AL-811H
on CW and SSB and would also like to try it on AM. The driving power on AM
is 25 watts.

Is this a correct use of the amplifuer and if so what are some operationa
guidelines as regards i/p and o/p power, duty cycle, cooling etc.

Thanks in advance,

Ralph Daniels, N1SK

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