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In Reply to: Re: 6BL7GT and 6BX7GT as drivers posted by Triode Kingdom on March 10, 2003 at 17:52:51:
and I'd be curious as to what you'd use in their stead. The use being a push-pull driver stage, as low an output impedance is practicle, and good section-section balance. Other points to consider is the interchangeability, withsimilar types, all the way from a 6AS7 to a 6BL7 can work in the same circuit if there is enough filament power and dissipation rating in the tail load.
regards,
Douglas
Follow Ups:
Did I phrase it correctly? Seriously, it depends on the exact requirements. I agree with KevinC, however, that 6BL7/6BX7s are difficult to locate with good internal matching. I have twenty-five or so lying on the shelf, and only a couple are close enough for use as push-pull drivers.
though I've heard them to perform well. Used a s a voltage amp in a linestage. One in ten useable, due to section matching and god knows what other criteria he uses before OK-ing a valve...wouldn't mind getting one or two ov his rejects.Thanks for the suggestion though, if you would part with some ov your rejects, drop me a note....
regards,
Douglas
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