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As I suggested make a short audio cable with the shield lifted at one end. Find one of the devices that hums, plug it in and see if the hum goes away. Isolate everything in the rack with plastic washers and don't let the chassis touch each other. When I was doing some tech work- time code...

Reading his last few comments, he still hasn't connected his effects one at a time to see if one of them- or more- have ground loop problems. If he isolates it to one or more, he could still lift the ground at one end of the cables to see if it makes a difference, or make a bunch of female to...

Reading what he said about some devices adding noise as he plugs them in tells me there might be a ground loop happening in the patchbay between some of the devices, especially if they are in a metal rack with all the chassis grounds tied together through the metal rack. Removing all of them...

Could be a mute transistor on one of the channel cards coupling noise to all channels- had it happen on a MS-16- or noise on the mute signal.

Sounds like you have a ground loop with the devices you have plugged into 1.3.8. Plug them in one at a time without the patchbay. Hum yes or no?

I have a new OEM 388 manual. PM me if interested

Thee are visible notches from tape wear on both the record and playback heads.

There is also a playback "Low Freq compensation" trimmer on the R/P cards recessed from the other trimmers.

There is a DIP swtich on the back of the Aq-65 that sets tape speed.

I have an MMC-100 to sell. PM me

Heads have the same track spacing- compatible P/N- but don't know about the routing to get 4 individual tracks from the 424. You could transfer two tracks at a time- L/R outs- then nudge tracks in the DAW until they line up.

Teac specified " clean lint free cloth" - they used something from Japan called Minmax, a tightly woven plastic cloth- feels like silk- with 91% IPA or denatured.. No rubbing alcohol @70 % with added Lanolin, no head cleaner- the heads are resin-, no foam swabs, no texwipes, as they can snag...

I have a document for modding the bias circuit to biasfor the + 9 tape.

Please PM me.

I cannot guarantee the card is 100% functional as I cannot test it, even though it was working when removed from the 388. As I had said in the auction, it is sold as-is. I wish I could test it but I can't. I don't want you to believe it will be a "plug and play " repair. I used to work on the...

I'm slowly shutting down my business and have a number of new and used Tascam parts available. Mostly 388, MS16, and other R2R parts including heads. PM me.

Early M3500 mixers had a ground loop problem on the I/O Jack pcbs. To see if your M3500 has the mods., remove one of the plates over the I/O jack pcbs -top rear. If there is a copper braided wire running through holes in all the Jack pcbs and tied to ground, the mod has been done.

Duplicate post

The two versions are pin compatible. The two extra transistors were added to regulate the "NST" voltages.

The R/P head Azimuth adjustments are usually sealed with some type of Locktite type liquid. Does it look like someone has tried to adjust them?