[BC] trouble with an old BC-1G need advice

[Gary Glaenzer]

I've heard 2600 @ 0.600 to 2650 @ 0.585 was the optimum point and observed
it on several 1G's

that works out to about 70%, which is just about all you can get (on a good
day, downhill, with a tail wind) out of a G


----- Original Message ----- 
From: " Milton Holladay" <miltron at mindspring.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Thursday, April 03, 2008 4:22 AM
Subject: Re: [BC] trouble with an old BC-1G need advice


> 1,000 watt xmtrs that employ 833A tubes in the usual plate modulated
scheme
> are designed to operate at ~2500 volts X ~540mA. Running much higher Ep
and
> lower Ip is not necessarily better.
>  IIRC, the secondary of the modulation transformer is meant to see a load
of
> 4600 Ohms to reflect a proper match to the modulators of 10,000 ohms p/p.
> Since E=IR, 2500 = ~0.543  X  4600 gives the correct operating constants.
> Efficiency is usually ~70% for these xmtrs.........
> M