[AMRadio] Re: AM Audio

Patrick Jankowiak recycler at swbell.net
Tue Aug 23 01:32:59 EDT 2005

Hmm.. 100mA for the pair; Maybe 3300V-3400V?

If so, you should not be short on modulating power ;)

Question is, how do you deal with the large DC voltage difference across 
the mod xfmr? is this not a risk?



> From: Geoff <w5omr at satx.rr.com>
> Subject: Re: [AMRadio] Re: AM Audio
> To: Discussion of AM Radio <amradio at mailman.qth.net>
> Message-ID: <4308F80E.4070506 at satx.rr.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> Hey, do some calculating...  That's -70V bias on the 250TH's, resting at 
> 100mA of idle current.
> Yes, the rig is -on the air- in that shot... 
> That's also about 300mA on the final, and the final is running around 
> 1500vdc at that time, I think...
> regardless, for 250TH's with -70v of bias, to have 'em rest at 100mA... 
> how much plate voltage do you think was on the modulators, at that time?
> --
> 73 = Best Regards,
> -Geoff/W5OMR

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