12au7 Tube Substitution?

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12au7 Tube Substitution?
« on: 19 Apr 2007, 08:01 pm »
Can an e80cc / 6085 be used as a substitute for the 12au7 in a Clarinet with the Hammond 370BX transformer? The e80cc draws twice the filiment current .6 vs .3. otherwise pinouts are the same.




Re: 12au7 Tube Substitution?
« Reply #1 on: 19 Apr 2007, 10:54 pm »
You'll have to adjust R313 or heater voltage will drop low.  But I would hesitate, as the rating for heater-cathode is not good enough for this application.  Probably end up whistling and then maybe fail.