Well, it looks like this project is going to move forward; Russell Tech is actually going to work on a pcb for this one!I've been looking at components. The capsule is obviously the AKG ULS series, and it looks like the AMI T8 output transformer is a good fit, which has the 7:1 ratio of the KM84. There's more than one good choice for the capacitor on the capsule, like Amtrans AMCH copper foil or RelCap polystyrene, but I guess many choices will be able to fit.Beyond this, the 1uf coupling cap is probably the most important passive component choice. Would anyone here be able to recommend a polypropylene film/foil that would be small enough to fit inside the AKG body? If not, maybe a pair of 0.47uf in parallel? What are some good choices for this capacitor? Should I consider metallized perhaps? I think that Wima has a small MKP2 that would fit.This is going to be fun. I look forward to comparing these when completed to my modded C460B mics.Thanks
"For transformer i would suggest 3U Audio GZT-47.Should fit without any problem, have proper ratio, and 3U Audio transformers are really high quality."Fascinating, 3U Audio for the past 6+yrs utilize AMI transformers for their higher end (more expensive microphones). http://3uaudio.com/cp.asp?id=610
Fascinating, 3U Audio for the past 6+yrs utilize AMI transformers for their higher end (more expensive microphones). http://3uaudio.com/cp.asp?id=610
It's not clear what you want to make. Russell have MK12 boards and schoeps topology for electret.Then you wrote about transformer and km84.
Yup.AMI trannies are not necessarily (!) better than GZ's own, but many buyers simply prefer American over Chinese.For a while Guosheng also used Sowters in some of his more expensive mics, but from what I recall he was less in tune with those.
I found it fascinating that Klaus claims the only transformer he ever thought was indistinguishable from an original old Neumann was one that Ollie built (AMI).
Yes, IIRW it was made with original laminations and all.Perhaps Klaus will chime in.BTW my post wasn't meant to put down AMI trannies in any way.But that was clear probably.