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Re: 6SJ7 conversion to 12AX7

63.246.169.178

Generally speaking, all that's required is to connect one section of the 12AX7 to the respective anode-grid-filament pins of the 6SJ7 socket. At $40, you're paying quite a bit for the convenience of a 12AX7 and whatever mechanical contrivance is supplied to physically mate with the octal socket. Given the inferior sonics of the 12AX7, I would suggest that you consider a 6SL7 instead. Rewiring the existing octal socket would allow a 6SL7 to be installed directly. Very little of the existing circuitry, in terms of component values, should require modification. I'll add that plugging in a 12AX7 with existing values is not likely to provide best results, either. If this is a high end amplifier, the conversion to another tube type from the 6SJ7 won't be strictly plug and play, no matter what someone may tell you. Sonics will suffer if the circuit isn't optimized. Incidentally, there are tons of 6SJ7s available on eBay, and audio suppliers generally have a good quantity of NOS at reasonable prices. Angela is currently selling a 10-pack of US-made chrome-dome WGT JANs w/metal base for $50. That's $5 each, probably 1/5 the cost of a 12AX7 of similar quality. Rather than switching to something else, this might be the time to pick up a few bargains for your amp!

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