1947 GE VR IRM-8C Professional Cartridge RPX-10 Turntable 1RM8C w STYLUS Working For Sale

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Complete and Working!
For sale is afirst generation 1947 GE VR IRM-8C

This is the Chrome plated PROFESSIONAL MODEL of the VARIABLE RELUCTANCE cartridge

(check my other sales for the MU Metal dull consumer model)

This the the Chrome Plated IRM-8C (catalog numbers RPX-25 and RPX-29), not the consumer version

IRM-6C (catalog numbers RPX-10)

This seems to be a custom production for CAPEHART with wire leads instead of terminals and no GE Logo on the shell.
Notable about this cartridge is that the inner cartridge is floating on rubber padding inside the chrome housing.
This was to give the cartridge more compliance and shock resistance

Condition: Great visual conditionexcellent plating with only light scuffing sides of housing.
Stylus bar and stylus present, the stylus is 3 mil for 78 rpm records Seems to have SOME WEAR. This cartridge had wire leads, they are cut off, but the 2mm wire stubs will allow you to attach new wire leads.
Cartridgehas continuity, DC resistance 274 Ohms.

Here is some information about this cartridge:

Type
variable reluctanceOutput Voltage
11 mVFrequency Response
20Hz -Tracking Force
28.5gMass
Channel Separation
Channel Balance
Load Impedance
Output Impedance
300 ohmsStylus
Stylus Tip
various spherical 3milCantilever
Dynamic Compliance
0.87 x10-6cm/DyneStatic Compliance
Notes
Mono 78RPM. *4.8cm/Sec

GE cartridge is an IRM-6C from 1947, often wrongly called RPX-10 it was one of the first Variable reluctance units manufactured by GE ....

Thepatent of the principle had been deposited at the end of 1945,it was designed only for 78 use

There was also the IRM-8C it was the professional model of the IRM-6C with a chrome plated body I believe that at that time, this sort of cartridge was mostly marketed for professional use, as were the earliest RPX models. The advertisement here promotes a diamond stylus, and my mind boggles at the cost of a diamond needle. This would have been at least $30.00 in 1940s US Dollars. Who would have had that sort of money? But it might have made sense for a radio broadcaster. Normal needles for things like this were osmium and, sometimes, sapphire. But considering the suffering required to replace the needle with this one, a diamond made sense.

Pls check more cartridges and phono items in my other sales.

All items will be safely packed to avoid any damage and promptly shipped.

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Photos may have been taken under fluerescent light. Color values may have shiften.

WE OFFER SHIPPING DISCOUNTS. IF you win multiple items, please wait for me to send you an invoice first before paying. That way I can make sure that you will receive a single low postage for the whole class=\"MsoNormal\" style=\"margin: 0in 0in 0pt\">Pls check moreturntable and phonograph items in my other sales.

All items will be safely packed to avoid any damage and promptly shipped.

Thank you for your interest, and enjoy!