Expensive Russian mics. Is there any pitfalls about getting inside the XLR barrels? eg threadlock on the obvious screws, twist the wrong way and some 70swg wire breaks or something like that? One barrel has something acoustically , not electronically, loose sliding around inside and the other has a bad electrical connection of some sort
Oktava Mk-012 microphones
Jul 14, 2014
5 Replies
according to a utube bod, looks too easy
Now I've got inside may as well find some sort of info/equivalent for the 3BF1 and 3107E transistors. With blue electros like the Philips ones of 1960s, looks like 1960s inside but for the glass+polyester pcb
schematic on
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In one a loose screw , needs nail varnish on these screws. The other one looks like a cracked die in a transistor from being dropped. I'll have to go with these www refs FET ABM7 = ( 3BF1?) = 2SK170BL PNP Si marked 3107e = BC179AP for the moment. Then the usual conundrum as a matched pair of mics with 3 inserts each, will have to make the desicion of replacing with the same matching transistor replacement in the broken one only or both mic stems
Probably a mechanical problem. The insert end core is not firmly held transverse to the pcb, and so poor contact between the mic central pin and the sprung pip contact in that core disc. At least plenty of space in that area to add a plastic brace, to farther back along the track side of the pcb
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