EHX - Polyphase (1976)

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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pinkjimiphoton
Transistor Tuner
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Joined: 12 Sep 2010, 19:03
my favorite amplifier: my own, a redesigned princeton
Completed builds: so fucking many goddamn pedals it would make your ass hurt just looking at 'em all!!!!!
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Post by pinkjimiphoton »

hey guys, i think it was scruffie asked if i could up some shots of this beast.
i'm trying to get it to work again for a friend. have replaced ALL the electros. one was a 22u that had had the covering removed. seemed to me the side referenced to ground was obvious, and it was the only unmarked cap on the board. i used the schematic from toppopicione's but i believe that may have a couple errors.
or it could be my eyes...that schem is hard to see.
unfortunately, i don't have a digital camera other than the shitty one in my phone, so these pics aren't ideal...so i tried to break it up into a bunch of closeups, hoping it may be able to help.
as i go thru this thing, i'll try and label the components and upload the pictures with the stuff labeled.
hopefully this can help get this cool toy documented properly, and working clones happening.
i still don't have it working as i type this..i can manually sweep the sensitivity of the filter, but that's it.

the two 220u caps i didn't have above 16v. so i used a pair of 100u's in parallel for one, and a pair of 220's in parallel for the first filter cap instead.
i may have to revisit that and make it the same as the 2 100u's in parallel instead of the presumed 440'ish i used there.

anyways. a lot , i mean a LOT of pictures. i bent the pots up so you can see what lies beneath, too. it'll be up to someone smarter than and more ambitious than me to be able to sort it out... but as this thing is dead, i hope to get help as i go to...be nice to ressurrect this beast!

again, forgive the shots..

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"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!

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