[Amps] IMD

[jeremy-ca]

Youre late Joe, I was already reminded of that goof by others hours ago.

I guess that you failed to read that, several times I said I run IMD tests 
at 600W. This will be the 3rd or 4th time Ive repeated that.

Carl
KM1H



----- Original Message ----- 
From: "Joe Subich, W4TV" <w4tv at subich.com>
To: "'jeremy-ca'" <km1h at jeremy.mv.com>; <amps at contesting.com>
Sent: Tuesday, September 25, 2007 9:06 PM
Subject: RE: [Amps] IMD


>
> Karl,
>
>> If you look at the AL-1200 specs they claim 1200W with 3
>> tubes so no matter how anyone wants to spin it Im not doing
>> anything different at 750W with two.
>
> The AL-1200 uses a 3CX1200A7 - not 572Bs.  The only Ameritron
> amplifier using 572Bs is the AL-572 and it specifications are
> for 1300 W output with FOUR tubes.  That's 325 watts per tube
> vs. 375 watts per tube that you claim and a gain of 12.3 dB vs.
> 11.7 for your "hottest" unit.
>
> Your gain is lower by more than .5 dB and the tubes are being
> pushed harder indicating the probability of increased IMD and
> poorer linearity.
>
> 73,
>
>   ... Joe, W4TV
>
>
>