Building custom MS Matrix

-Elsewhere-
More EMI TG12345 Mk II/III fixin'.

Ampex 351 studio B #2 (labeled #4)-
Noise on the output with the input level down.
One of the output transformer primary windings burned out. The B+ measures a little high. Replaced output transformer, and changed R60 to 3Ω to drop the filament supply voltage. The old selenium rectifier was replaced with a modern silicon one, meaning higher voltage. Also cleaned the VU meter bypass switch.

Green Rhino MkII takes a while to start working... Seems to be related to an overly complicated power and bypass circuit.
Dead Beyer 160 - needs new ribbon.
351 stuff

Ampex ATR 102 #2 (studio B) -
Won't turn off. Power switch failed, permanently ON.
Replaced power switch. If you don't have a manual, (and assume the word "carefully" precedes each step)-
Remove the deck top cover plate (easier to pull out if you remove the tension rollers, that way you avoid contact with the capstan and timer rollers).- Reach under the front hood, to the right and past the card cage, and disconnect the two multipin connectors mounted on the power supply. They have locking clips on the top and bottom you squeeze together to release them. Watch that you don't mess with the other cable harnesses roughly.- Flip the machine upside down on the stand and tighten down the swivel clutches (obviously, the power, audio cables disconnected). - Collect all the old and new razors that just fell on the floor.- Open the power supply access trap door - Unscrew the 3 bolts holding the power supply to the chassis from the other side (top of the machine, which is now upside down).- Lift the power supply straight up and out, feed the power cable through the hole in the chassis.- From there it's obvious where the switch is and what to do. The wiring is tight, just take your time...- When you reinstall the power supply you have to keep in mind the switch position and hook for the switch actuator arm. I just had a hand on it and eased them together while lowering the PSU. It could be easy to bust the switch actuator under the weight of the supply, if it landed off. - Bolt the guy down and do the other steps in reverse. - Turn the machine on and off, why don't you? Realize the switch is in backwards.- Do everything over again.Just kidding, thankfully the switch has a polarizing key to prevent that chance.I clean all the dust out too. That was satisfying.

Dude those are VINTAGE razor blades.

steve wrote:Dude those are VINTAGE razor blades.What records were they used on and will my edits sound as smooth?= Justin

RCA 74 -No output.Wire off of the ribbon (new) lost bond with the ribbon lug.We have installed a Symphony Mk II in Studio B.

Faceplate arrived for a custom MS matrix I'm building. Final bit of assembly...

More MS Matrix...