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TAB-Funkenwerk U47 with C3G (Triode strapped)
Old 28th May 2020
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TAB-Funkenwerk U47 with C3G (Triode strapped)

Has anyone experimented with using a C3G Triode Strapped in a U47 circuit? Modifications to the socket assembly, bias circuit, voltage divider array, and B+ Would be necessary but possibly worth it?

Check out these specs:

Ri of 2.3K when Triode strapped! That would make a good match for a BV8 style XMFR.

I know Ronin Applied Sciences used this tube in their Pegasus mic but wired as a pentode.

Any thoughts or ideas would be appreciated.
Old 29th May 2020
Lives for gear
gyraf's Avatar

It's completely unpredictable how well a tube - that is not made for the purpose - will behave as microphone front end. This because the parameter most important - behavior at very-high grid impedance - is undefined.

So try it, preferably with 5-10 tubes from same batch, then report back here

I have considered trying the same, just haven't gotten around to it yet..

/Jakob E.
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