U87, figure 8 is dead

[ccaudle]

Maybe that can be replaced ?

The picture in post #16 appears to show some debris collected in the gap between the two backplanes. If that debris is conductive then perhaps when it is removed the isolation will be restored.

 

[saint gillis]

And finaaaly, I've opened it :



No chance to get backplates isolation ...

 

[Khron]

One must now wonder if that is indeed the stock capsule that microphone came with... Or has it been "upgraded" at some point?

 

[saint gillis]

No it has been "upgraded" as you say
The guy told me "the Braingasm has been upgraded by a Heiserman"

 

[saint gillis]

You absolutely need isolated backplates to get a figure 8 pattern with this circuit.

Soliloqueen sells a really nice k87 capsule

Thanks, I've advised the guy to get a K87 from her/him

 

[Khron]

No it has been "upgraded" as you say
The guy told me "the Braingasm has been upgraded by a Heiserman"

A good (and likely also pricey) capsule, but not for this circuit...

 

[saint gillis]

A good (and likely also pricey) capsule, but not for this circuit...

But the pictures I've posted look different from the pictures from Heiserman's site ..

 

[elskardio]

Thanks, I've advised the guy to get a K87 from her/him

https://arienneaudio.com/

 

[Mihobro]

In the picture it appears the washers and connector ends of the two plate wires seem to be touching. Need a continuity check between plates with wires attached? Also is the diaphram shorted to the right plate?

 

[Khron]

In the picture it appears the washers and connector ends of the two plate wires seem to be touching. Need a continuity check between plates with wires attached? Also is the diaphram shorted to the right plate?

Neverminding that the last activity in this thread was over a year ago, but as the picture in post #22 clearly shows, the shim between the two backplates is clearly brass, so the existence of electrical contact between them is beyond any shadow of a doubt.

PS: What's "diaphragm shorted to the right plate", and why should it be?

 

[pucho812]

Never seen a toothed washer used on a capsule connection, by the way...

It’s a feature