I recently picked up several sleeves of new 6HE5 compactrons. The data sheet looks very similar to a 6V6: with 250 volts on the plate, plate resistance is 50K, transconductance is 4100 uMhos, plate current is 43mA. Max plate voltage and dissipation are actually a little higher than a 6V6.
I'm considering a push-pull amp with these 6HE5s; has anyone tried them?
(In fact, I'm thinking of an all-compactron stereo amp, with a dissimilar triple triode for the input and phase-splitter duties, and the 6HE5s for outputs).
Comments and other alternatives appreciated, as always.
I'm considering a push-pull amp with these 6HE5s; has anyone tried them?
(In fact, I'm thinking of an all-compactron stereo amp, with a dissimilar triple triode for the input and phase-splitter duties, and the 6HE5s for outputs).
Comments and other alternatives appreciated, as always.
It appears to be identical to the 6EZ5, which is similar to 6V6. I haven't looked closely at the curves, but it should work nicely in any 6V6 circuit. Almost double the filament current though. I'd use a 6U10 as a gain stage and long-tail phase splitter, since I have a half-dozen. Sockets are the hard part, though AES has 'em, and they show up on eBay from time to time.
Thanks for the response, Tom.
I'll try to lash something together and report back on the initial performance. There are several triple-triodes worth looking at; one with mu factors of 70-20-20 (like half a 6SL7 feeding a 6SN7), a couple with mu factors of 100-100-100 (ex. 6C10, like 1 1/2 12AX7s), one with 46-18-18 (like half a 5965 and a 6SN7), and so on.
At local prices as low as 50 cents each for NOS compactrons, I can afford to do lots of experimenting without really worrying about inadvertently toasting something.
I'll try to lash something together and report back on the initial performance. There are several triple-triodes worth looking at; one with mu factors of 70-20-20 (like half a 6SL7 feeding a 6SN7), a couple with mu factors of 100-100-100 (ex. 6C10, like 1 1/2 12AX7s), one with 46-18-18 (like half a 5965 and a 6SN7), and so on.
At local prices as low as 50 cents each for NOS compactrons, I can afford to do lots of experimenting without really worrying about inadvertently toasting something.
If you have two gain stages, the mu = 18 triodes are enough - like 6MJ8. The squat little 6U10 is cute though... 6C10 and similar are hard to find and pricey - used by Mac, Ampeg, Scott.
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