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Also is there a way to isolate one split from phantom power? what if I were to permanently lift the ground, that would certainly not pass phantom but what are the reasons this should not be done? Any other input on the subject is welcome. +1 on just using a Y type splitter. If you were trying to mi...

If you want to use dual pots, go with 5K if you can find them, 10K if you can't. You should be able to find "stereo" ganged pots that you can use pretty easily, and they don't have to super expensive since pot to pot matching actually isn't super crucial for this setup. You could try this guy: http:...

What's the reason for the series 2.2K resistors? Not second guessing, just wanting to understand. They do 2 things. They provide the series resistance to drop the voltage through the pot shunt. If they weren't there, the series resistance for the voltage divider would just be the output impedance o...

Yeah, if the primary reads OK, which it sounds like it does, then *probably* the transformer is fine. I think the PM1000 power supplies put out like 2 or 3 voltages, one for the main audio stuff, one for phantom and maybe one for like the lamps and stuff. I assumed all the output voltages were gone,...

One of just a few ways a power supply can completely die that won't cause a fuse to blow is if a coil in the transformer opens up, probably the primary. If you've got another transformer on the spare supply, you might want to just go ahead and swap it and see if it helps. Or if you want to test firs...

Do you have the owners manual for your machine? It's a big book and covers a lot of stuff including everything you mention and lots more. I'm sure you can find one on ebay. If not, I have one to spare, you can pm me.

Hi. I don't know if I've fully digested everything you've written here, but to me it still sounds like you've got oscillation in the board or in the power supply. What makes you think you've got a dead short? Have you measured the short with an ohmeter? I think there's nothing wrong with the meters....

Hi. So it sounds like now the PS can supply the board without blowing your 2A AC line fuse? But the stability problem is still there? Personally, I don't think you did anything wrong by upgrading the PRIMARY filter caps on this. I don't think any of your problems have been caused by extra inrush, an...

The reel table height is adjustable on these. Are you sure even though the reel isn't warped that it might not be scraping against the head of a screw or something like that? It really sounds to me like you probably just need to adjust the reel table out from the machine a bit, but of course I guess...

I've got to be honest....I think the idea of making a tape delay where the delay part is done with an IC seems kind of crazy. First of all, making an electronic delay is not a super simple thing, and I don't think using one will make the mechanical portion of the job THAT much simpler. In other word...

Good luck with this! I've semi-thought about trying to cobble something like this together a few times, but never been able to think of something that would work so great it would be worth the time, so never really tried to put any notions into action. I think it would be kind of hard maybe, but may...

Hi. I'd love to see a pic of your ampex data recorder. I checked your link, and that guy mentions the preamps for his recorder were 350's and 400's which means it was NOT an FM recorder. It probably must have been to begin with, but it looks like he must have converted it to regular non-FM electroni...

In theory, tape hiss shouldn't be a problem at all with FM recorders. The carrier should be printed on the tape at a big enough level that the hiss wouldn't have much chance to modulate it. But there would be lots of other electronic ways for noise to enter the picture. For example, the carrier sign...

I think you mean a collet knob tool? I doubt if you'll find something specifically designed for removing collet knobs for very much less than the $60 one, but for way less than $60 you could go buy a flat head screwdriver and a file, then file the screwdriver to the right shape to do it. I assume yo...

There are a couple of differences, actually. The 1592A has a 2 way voice/music switch under each pot. If I'm remembering right, the voice position is just a HPF. The 1592B has a 3 way -10/-20 db pad under each switch. The two do have different master section electronics. I don't remember all the det...