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

[Milton Holladay]

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
----- Original Message ----- 
From: "Bob Groome" <bobgroome at yahoo.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Wednesday, April 02, 2008 12:02 PM
Subject: Re: [BC] trouble with an old BC-1G need advice


> Seems to me you should be seeing:
>
> 4.47 RF Amps out for 1 kW
> PA Plate 430 to 490 mA ( 600 is too high)
> PA Plate Volts 2.7 to 2.9 kV (lower is not
> better)
> PA Grid 85 to 120 mA

----- Original Message ----- 
From: "Neal Newman" <cozy659 at yahoo.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Wednesday, April 02, 2008 12:18 PM
Subject: Re: [BC] trouble with an old BC-1G need advice


>  Need the Plate voltage to figure out the Power..
>
>
>
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