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In Reply to: RE: lowest Z line-drive CF mode noval twin-triode, must be no taller than 12A_7 types. posted by Timbo in Oz on January 04, 2016 at 19:15:13
How much high voltage current do you have to spare?
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But I don't have an exact figure.
He might remember - he serviced the pre late 2015.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
The 5687 can be run at higher currents than the 12AU7 to accomplish what you're looking for. The ECC99 will plug right in for the 12AU7, but can be operated much like a 5687 (the 5687 has a different pinout).
The 6DJ8 family can technically get you pretty low (sub 100 ohms), but you'll need to know the maximum expected voltage you intend to deliver and the minimum load you plan to let the stage see to determine if this is a suitable design for you.
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