First, this is an amplifier question - even though the amplifier part in
question is from a class c amplifier rather than a linear amplifier.
One of these days I plan on building a 500 to 600 watt plate modulated rig.
I have all the parts except the modulation transformer. Finding a 300 watt
transformer normally involves the expenditure of about $150 or more. I am
considering another option - that of using 2 modulation transformers from an
ART-13 in parallel.
The normal arrangement in an ART-13 is P-P 811 tubes modulating an 813.
What I would propose is P-P/parallel 811 tubes modulating push-pull 813s. I
realize that there may be no real advantage to running the 813s in
push-pull, but I have the parts and it sounds cooler (only for one band, so
bandswitching is not an issue).
I already have the ART-13 transformers. They are beauties. The additional
advantage of the ART-13 transformers is that there is an extra winding,
which would be used for feedback to the earlier stages to reduce distortion.
I have hunted numerous books and never found it discussed. Anyone done it
before. Any concerns? Are resistors needed to match loads?
73, Colin K7FM
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