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A preamp isn't needed? On what planet?

The mics are worth keeping. The Mona needs a computer with an empty PCI slot to work.

Where are your input trims? Have you tried connecting the aux outs to a something other than the Behringer? Does the Behringer have an input sensitivity switch?

I see 4 stereo aux outs on the back of that 520. A quick look at an online manual shows master faders for them. Have you read the manual?

Are you saying there are no aux masters on your board?

I'm assuming the 520 has both input trim and aux master out controls. Initial individual input pre fader gain to the aux rail is dependent on where the input trim is set. Final output gain for everything sent to a given aux bus will depend on that aux master's out setting.

Without a test tape, you are chasing your tail. Don't mess with anything until you get one.

In the world of analog tape machines, test tapes are essential, as are signal generators, and o'scopes. You are flying totally blind without them.

Also, do you have a test tape and a scope to check the alignment of your r/p head?

If the guides & reel table heights are properly set and the only problem is with the erase head, then I'd be looking at that head being too far back. Even if there is no adjustment per se, there could be some wear at the mounting point. Just out of curiosity, is this problem repeatable with a...

Do you have the service manual? Is there any way to move the supply guide back? Perhaps it's too far forward and not allowing proper contacted with the headstack.

If the tape is hitting the top of the guide, that guide is too low. There has to be a way to raise it so the tape is running evenly through it.

You mentioned that when you applied pressure with your finger that it erased ok across the entire tape so it isn't the head. Is there a center guide misaligned or worn guide somewhere in the path?

Try micing the edge where the head meets the shell at an angle. Start @ 45 degrees and modify to suit.

All Ampex 456 will have sticky-shed as will 3M/Scotch 226 & 250. Makes no difference how or where they were stored.

Perhaps the overheating resistor is defective. If not, it's seeing more juice than it should making the power supply and/or specific branch from it the most likely causes.

If a fuse keeps blowing, you have a problem somewhere farther back in the branch the fuse protects or in the power supply itself.

She was correct. The only caveat is that you don't want phantom on most older "non-powered" ribbon mics. Furthermore, Wes Dooley of AEA Microphones, recommends that dynamic mics be plugged in and/or out with the phantom power off to avoid magnetization of their internal transformers.

The techs I knew at TEAC/TASCAM all advised against long term use with a deck standing up. Their reasons were in that position: 1. Cleaning the tape path was more difficult; 2. It was not as easy to edit; & 3. the motor bearings were supporting the weight of the motors.

So the procedure I outlined didn't work or have you not tried it yet?