By the way, does anyone have any experience using the RCA 5500 5500 units?
They are about the same quality audio-wise as typical ham radio quality mod transformers such as the UTC S- series, or the Thordarson or Stancor "universal" transformers. Not as good as the UTC CVM series. Definitely not broadcast quality.
I have tried a couple of them out, and found the low end frequency response to be lacking, and phase shift distortion to be obvious by just looking at the envelope pattern.
Those transformers were not designed for voice modulation, but rather, single tone modulation. They were built for tone modulated CW use during WW2 on Liberty Ships.
The voltage, impedance and power ratings listed on the nameplate do not add up mathematically.
They will work ok if you have a modulator that will work into a fairly low plate-to-plate load impedance, such as a quad of tubes in pushpull-parallel. The 1:1 turns ratio should allow for very good positive peaks. But don't be surprised to see visible waveform distortion on the envelope pattern with the scope.
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