I owned a solidtube for a short time bad comes to mind.  I did like the capsule mount and the transformer did not look bad.

If I was to rebuild it  I would use the Royer CF circuit like the CB microphone, PDF is at jensen.com.  I would use a ef86 cathode follower and the capsule with a >=2.2uf to the transformer.  Now the fil supply would need to be dropped to about 6VDC and the B+ maybe to 100V.

I would take out the foam inside the grill.   I would get rid of the led that makes the tube glow.  I would point to point it. There has to be alot of solidtubes not being used for anything.

uhhh

this mic is an electret no?

just sell it its worth more selling it for $400 or $500 than modifying

That looks like the xfo's in MXL mics.

I had some good results with the Royer 'Country Boy' mic circuit using a shure electret element. I think the simplicity of the circuit is a real plus.

CJ (or anyone) - I was measuring some Oktava mic transfomers last night and could not get inductance readings for the primary windings - it was off scale. My multimeter only goes up to 40H, but I had expected that to be enough. Is >40H a sensible value, or did I fnck up somehow? I've only just bought the meter and this is my first attempt at measuring inductances.
I got about 1H-2H for  the secondaries.

Stewart

If you gonna hack it, send it to me (unless you have particular scientific interest)--I wanted to try the coil with nickel or cobalt lams. BTW, what sound difference between two would you expect?

Oh,,,send me the other one then..

I actually have one for sale now.  :oops:

Gustav

Thanks Stewart,

I will send you email later tonight.

:grin: Just thought you were gonne send it for experimenting...and was kiddint about sending it to me.
I do have one for sale though.


Gustav

Thanks CJ. I got sensible values for the mkl2500 transformer tonight, so I think my technique  is OK. I guess the others are just bigger than the meter's range.

Gustav,
I thought you were kidding but this thread's gone way OT & if you had wanted the other tranny I could probably spare it.

 :guinness:  :sam:  :guinness:

Thanks Chris.  Can you tell anything about how it is wound by looking at the coil?  Please unwind it I have a few more.

FWIW the Nady 1050 uses the same size core lams.

I was thinking in a DIY way when I sent you the transformer.  Maybe people can rewind and recore the transformer when modding a china microphone.

How soon before a "redesigned" transformer is in an AD for a china built microphone(s)!!!!!!!!!!!!!!!!!!!?

I had built a CF microphone circuit for the v67 thinking of DRUM use that stock transformer sounded BAD.  Chris no need to send it I will look for some lams.