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RE: Tube bias changes...

Posted by Nunki (A) on January 18, 2011 at 02:43:20

In Reply to: Tube bias changes... posted by mkuller on January 17, 2011 at 15:13:37:

thank you - here we go:

i checked all small tubes and they were ok but the twin sytems of both TFK ECC801s differed around 20% from each other what is rather astonishing for that quality brand.(i had placed one of them in each channel). i kicked them out the amp and replaced mullard 12AT7 and tested Siemens ECC801s also and everything seems to be fine again.

i will stay away from TFK 801s as i remember an expert´s statement who described this TFK is designed for a limited bandwith in operation. don´t know whether this is a true technical characteristic but i corresponds to my experience though.

a feeling remains that other tube amps sound more precisely ("darker") in bass performance - may be further breaking in will bring some improvement...

Nunki

BTW: can anybody discribe the bias function of the MC275 IV please and how it works? (or where i could read about and even additionally test myself perhaps...)

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