I've recently made a some experiment on the hybrid tube mosfet Erno Borbely Op Amp, using the russiam submini tube 6N16b, the test was done with a gain of 10, with a variable PSU to +/-24 till +/- 64. things seams change a lot in term of distortion from 24 to 50, and no substantial change from 50 to 64.
so I 've decided to run the baby with +/- 48, . the Op Amp sounds very good with a Cinemag CMOQ-2L as output trasformers, and now I wanna try to build a trasformer coupled mic pre around this OpAmp.
the question is : Since I've burn up some resistors during R5 trimming I'm afraid something else was happened, the output trasformer, wire 2:1 isn't really burn up , but now when I put it on a metal base, like the bottom of a my case, it loose 6db, seams to me it has loosed isolation... possible ( !? )
maybe was a defected one
too match out put current can cook the trasformer ?
thank you.
clik to see schem.
so I 've decided to run the baby with +/- 48, . the Op Amp sounds very good with a Cinemag CMOQ-2L as output trasformers, and now I wanna try to build a trasformer coupled mic pre around this OpAmp.
the question is : Since I've burn up some resistors during R5 trimming I'm afraid something else was happened, the output trasformer, wire 2:1 isn't really burn up , but now when I put it on a metal base, like the bottom of a my case, it loose 6db, seams to me it has loosed isolation... possible ( !? )
maybe was a defected one
too match out put current can cook the trasformer ?
thank you.
clik to see schem.
