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I had gotten my son a Sovtek mig 60 for Christmas. The seller was supposed to advise me of the mods he made. But, that has not been forthcoming. Anyway, my son brought it home this afternoon so I was able to take a look at it. What I can see is that on valve 1, pin 3 he changed the cathode bypass cap from 47uf to an electrolytic 1uf. And, on pin 8 he added a 2.2k resistor in series with the existing 1.1k bypass resistor.
On valve 2 pin 3 he put what looks like a gumdrop cap(?) around r9 the cathode bypass resistor. This thing is orange more or less round about 3/16th in diameter. The markings on it say 2.2 and 50. I took a leg loose and tried to read it but I get nothing. On caps test it just shows 0.000. I also tried a diode test both directions and got nothing. Then I tried an ohm reading and got overload. Can I assume this is a cap that burned open?
Anyway, my son says he wants a "fatter" more "meaty" tone with less "crunch". Does that mean anything to you guys out there? The guy who made the mods said they slightly increased the gain and made it a little less brittle. Would I be better just going back to the stock setup or do you have some suggestions to make it "fatter and less crunchy"?
Bruce Collins had suggested I put in either a 12ay7 or 12av7 for the first tube and then bypass pin 3, v1, with a 10uf cap instead of the 47uf. And, then add a bypass 1uf on pin 3 v2. My only problem is I can't get those tubes locally. Sioux Falls is not the mecca for tubes or parts.
Are there other easy things I could try 1st before sending out for tubes? What parts of his mod should I redo? TNX John
On valve 2 pin 3 he put what looks like a gumdrop cap(?) around r9 the cathode bypass resistor. This thing is orange more or less round about 3/16th in diameter. The markings on it say 2.2 and 50. I took a leg loose and tried to read it but I get nothing. On caps test it just shows 0.000. I also tried a diode test both directions and got nothing. Then I tried an ohm reading and got overload. Can I assume this is a cap that burned open?
Anyway, my son says he wants a "fatter" more "meaty" tone with less "crunch". Does that mean anything to you guys out there? The guy who made the mods said they slightly increased the gain and made it a little less brittle. Would I be better just going back to the stock setup or do you have some suggestions to make it "fatter and less crunchy"?
Bruce Collins had suggested I put in either a 12ay7 or 12av7 for the first tube and then bypass pin 3, v1, with a 10uf cap instead of the 47uf. And, then add a bypass 1uf on pin 3 v2. My only problem is I can't get those tubes locally. Sioux Falls is not the mecca for tubes or parts.
Are there other easy things I could try 1st before sending out for tubes? What parts of his mod should I redo? TNX John
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