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The EH ManModerator
Pull the tubes, one at a time and see if it stops.
The EH ManModeratorI think Z is still fuming over the theft of an empty pedal housing at NAMM.
The EH ManModeratorFrom the pic you posted earlier, it looks like the output jack has rotated and is shorting out against the chassis. Loosen the nut and turn the jack so the ground tab is down against the chassis. Re-tighten and try it out.
The EH ManModeratorVery typical of Z Vex.
The EH ManModeratorBefore you do anything else, audio probe (or ‘scope) the op-amp output to see if anything’s coming out. Might be a bad footswitch after all.
The EH ManModeratorI don’t have the schematic in front of me but you can follow the input jack lead in across a cap and/or a resistor and find where it goes in to the 1st op-amp stage.
The EH ManModeratorSounds like your power supply is OK. The op-amp may do the trick for you.
It’s really not that complicated for replacing the NE5554. Just a matter of matching pins up with a couple of 15v regulators. If you really need to replace it I’ll post the details here for you and others.
If you can, while you have it apart attach a heat sink to the NE5554. Might make it last longer and you may never need to replace it.The EH ManModeratorAssuming your power supply is working correctly and you have +15 and -15, I’d replace the first op-amp because that’s where your bypass signal comes from. If your power supply is bad, replace the NE5554 IC w/ a couple of 3-legged voltage regulators.
The EH ManModeratorWhich one do you have? See this link:
http://electroharmonix.ronsound.com/index.php?option=com_content&task=view&id=30&Itemid=45The EH ManModeratorI already have a DMM (custom w/ blue graphics for a former EHX employee) so I’ll be picking up a Time Machine sometime soon. I’ve started collecting EHX clones since I can’t find EH stuff I don’t have.
February 8, 2009 at 3:11 pm in reply to: Holier Grail – Intermittent Fault: due to overheating? #92921The EH ManModeratorI would suspect a bad solder joint somewhere, possibly on the Blend pot where it solders to the board.
February 7, 2009 at 1:54 am in reply to: Layout Photos of 1978 Electric Mistress with EH 5200-1C circuit board #92847The EH ManModeratorEH-5200 should be the Attack Decay pedal. Can you post some pics of your circuit board?
The EH ManModeratorI think you’d be better off asking your question here:
http://www.diystompboxes.com/smfforum/index.php#2Lots of good DIY info to be found!
The EH ManModeratorHe already has it on ebay w/ a starting bid of $125.
The EH ManModeratorYou’ve got one of those odd MN3007-only versions from 1980. The other one like that I had info for was from 1981. Thanks for the info. I’ll add it to my list.
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