Modulation driver transformer

[Barrie]

I'm making good progress on a transmitter RF deck and am starting to think about the modulator.

I have everything I need for the modulator except the driver transformer.

I want to use a Bogen tube amplifier for the speech amp.  It has outputs from 4 ohm to 600 ohm.

I know that a lot of fellows use a hi-fi output transformer hooked up backwards to drive modulator tubes.

The tubes I will be using are the VT-127As, which are very similar to the 100TL, with about 2000 volts on the plates.  The modulation transformer is from a BC-610

Using the Bogen tube amp as the speech amp, into a hi-fi output transformer, how do I determine the output impedence of the driver transformer, and the wattage?

Thank you & 73,
Barrie, W7ALW

[WD5JKO]

Barrie, take a look at this link from my good friend, John WA5BXO:

http://www.qsl.net/wa5bxo/driver1.html

Jim
WD5JKO

[K1JJ]

See:  http://amfone.net/Amforum/index.php?topic=23632.0

Barrie,

Consider a homemade MOSFET solid state audio driver. There are many advantages to this approach. Driver transformer phase shift and other tube limitations are gone. There is even a spot to add negative feedback.

73,

Tom, K1JJ