Messages

1

Reel to Reel Tape Machines / Re: OTARI MX5050

« on: November 02, 2010, 02:53:21 PM »

The level switch on the back of the Otari is very misleading.  While one would think that it would allow the user to adjust the bias for different kinds of tape, in fact all it does is to change the playback levels to compensate for the amount of headroom which various types of tapes have. I believe the positions are for Ampex Operating Level (low), 250 nw/meter (comparable to Ampex/Quantegy 456 tape) (medium) and (320 nw/meter) (high).  The recording bias on the Otari needs to be adjusted manually.

2

Prerecorded Tapes / Re: tape squealing, not backcoated tape...

« on: November 02, 2010, 02:46:59 PM »

I ran into the squealing problem with a Dolby Decca recording of The Mikado (duplicated by Ampex), and with one Barclay Crocker copy of Gottschalk music for two pianos.  The tape used on the Decca/London recording was black (like Scotch 202); the B/C was the standard brownish oxide which Ironbut mentioned.  The tapes were not backcoated.  In each case, baking made absolutely no difference.  I tried the tapes on two different machines-a Revox A77 Mk IV and an Otari MX5050B-II.  Both machines were squeaky clean.  I tried applying LAST tape treatment to the heads and guides with no effect. 

This is not a sticky-shed problem, because the tape doesn't shed-it just squeals after about ten minutes, and baking makes no difference.  My guess is that the lubricant in the tape is simply dried out.  I don't think there is anything that can be done.  Fortunately, I've found it to be a very rare occurrence.

3

Tape Project Machines / Re: Otari MX5050 felt pad...

« on: November 01, 2010, 03:38:53 PM »

My MX5050B-II also has the ring of foam.  I think Bobschneider's description of its purpose is correct.

Be very sure that you're using the correct kind of oil for the capstan.  The Otari manual says that only one specified kind of oil should be used on the motor.  If you don't have the correct oil, you can purchase it from MDI Precision Motor Works.