[RuudNL]

Just for fun, I recently put together a "U67"-ish microphone.
It is a kind of mix between a U67 and a U87.
The microphone works as expected, sounds good and I don't hear any difference between this microphone and a U87ai.
Measured self noise is 2 dB higher than a U87ai. Not too bad, but maybe a better EF86/EF806 could improve this.
I used an original Neumann capsule that I had as a spare.
The microphone is powered from an existing tube power supply, delivering +120 V for HT.
De-emphasis is through feedback from the output. (15 KHz is 5.5 dB down referred to 1 KHz.)

For those who are interested: the schematic is in the attachment.

[OneRoomStudios]

Very nice. Which output transformer did you use?

[RuudNL]

This one (3U Audio):

https://www.ebay.nl/itm/3U-Audio-GZT-87-Output-Transformer-for-Condenser-Microphone/111683319855?hash=item1a00d8382f:g:f6kAAOSwiCRUg89Z

Although is has a small core, the frequency response is excellent.
(Measured from 'test input' to output, 20 Hz is only 1 dB down.)

[kingkorg]

This is phenomenal. Thank you for sharing!

[RuudNL]

Picture of the prototype.

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