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April 15th 04, 05:25 PM

Gary Schafer

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On 15 Apr 2004 08:45:07 -0700, wrote:

Gary Schafer wrote in message . ..

It will work fine.

Hmmm...PP 807's @ same load Z as PP 811A triodes...interesting...

It doesn't matter what the actual impedance of the modulator or the
final is. It is the ratio that matters.

The ART 13 transformer has a primary rated at 15000 ohms and the
secondary at 7300 ohms. That is a ratio of about 2:1.

The Johnson viking 2 (pair of 1625s modulating a pair of 6146s) used a
transformer with a ratio of around 2.4:1 or so if I remember right.
That was a little high as the modulators would go into clipping before
100% modulation could be achieved on that rig. A little lower ratio
mod transformer would have allowed a little more modulation.

So the ART 13 transformer is just about ideal for that kind of setup.

73
Gary K4FMX

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