diy 6n2p to 12ax7 adaptor for 6.3v heater taps only

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diy 6n2p to 12ax7 adaptor for 6.3v heater taps only

Postby pinkjimiphoton » 28 May 2018, 10:01

so i been messing with russian analogs of more common tubes, and my new fav is the 6n2p. they're cheap, robust, plentiful, and have a really great presence in the midrange going on.

they're only for fender style 6.3volt heaters.... some 12ax7's sockets are wired up for 12 volts, the 12ax can do 6 or 12, but the 6n2p can only do 6. but 6.3 is fine.

to start, go to tubedepot or whatever and get some socket savers, the kind that have a screw running thru them. check the pics.


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unscrew the screw, and set the washer and screw and nut aside. i stand it up to unscrew it so the little nut just falls out. this is what the guts look like


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here ya can see where i bent pin 5 across <with a slight arch in it to accomdate the screw>
and connected it to pin 9


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here ya can see where i used my fiskars to nip away pin 9 from the socket where the tube will be installed. first i cut up by the phenolic as close as i can, then a little bit below where i soldered pin 5 to pin 9. the pin is stiff enough to support the soldered on post, make sure ya get a good joint before ya snip it.


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pins stuck back thru the phenolic... note no pin 5. be careful with tube insertion, as effectively there's now two possible keyways on the tube. you could take a piece of medium paper clip and solder it to pin 4 if ya really need a pin 5. i just said the hell with it.


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some peeps suggest leaving pin 9 connected to pin 8, the cathode, but then you're floating the shield above ground potential cuzza the cathode rc networks in most guitar amps. since its just a shield no need to even bother with it. when i did connect to the cathode i got more of a hum. you also don't want it connected to the heater supply, as it would be like an antennae i'd imagine.

anyways.. easy breezy, way easier than i thought it would be. here's the assembled socket sporting one of them beautiful tubes


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and here's a crummy shot in action inside my pro reverb, first tube <dry channel>

so .... if ya been wondering, this is how ya do it. its easy, and the tubes are cheap and sound freekin great!


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