RCA Recorder Head MI-4896 info

[cuttercollector]

I had one of these portable units too in my old large collection.
It is gone now along with most of the older units that only ran at 78.
I am no longer worthy of my name on this forum

[motorino]

use a speed regulator from a electric hand drill.... no? check the motor temperature whit your hand .. without volts!

or double the velocity in your wave editor, from 44.100 to 96.000, you dont use that lathe Cuttercolector?

[cuttercollector]

Speed regulators for electric drills tend to chop the voltage on and off like a light dimmer, which is good for brush type motors but not the synchronous or induction motors used in turntable drives.

I got rid of most of my collection of older cuttters that only ran at 78 RPM including the RCA portable .
I kept 2-3 of the later units with at least 33/78 and a couple that do 45 as well.

Yes, if you are using a computer you can change the speed of the sample to make it come out recorded at 78 to the correct pitch for what ever speed you choose - 45 or 33. That is hard to do for analog signal paths and the eq gets changed so you have to compensate for that too. Also if you speed up the samples, the highest frequency fed to the cutter goes up as well. This is a bad thing as most old cutters don't have good high frequency response anyway, perhaps 10Khz., so your result ends up with the highs severely chopped off at closer to 5Khz.

[motorino]

if you put a diode? or try with a snubber....

the frecuency converters for single phase ac motors are expensive, but in ebay...