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The basic circuit is more or less the same as the U87.You have to superimpose the signal from the drain through the 1M/220p/0033u/6K8+560R/0.47u network on the polarisation voltage.I noticed that some 'China' K67-ish capsules require much less de-emphasis than the original K67 capsule.So I think it might be a good idea to experiment a little with the 220 pF capacitor.But in doubt: why not build the U87 schematic?
The basic circuit is more or less the same as the U87.
You have to superimpose the signal from the drain through the 1M/220p/0033u/6K8+560R/0.47u network on the polarisation voltage.
I noticed that some 'China' K67-ish capsules require much less de-emphasis than the original K67 capsule.
So I think it might be a good idea to experiment a little with the 220 pF capacitor.
But in doubt: why not build the U87 schematic?
