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For sale is a first generation 1947 GE VR IRM-6C
This is the Shellac coated MU Metal CONSUMER MODEL of the VARIABLE RELUCTANCE cartridge
(check my other auctions for the professional CHROME PLATED Professional IRM-8C model)
Also of note is that the inner cartridge is floating on rubber padding inside the Mu metal case. This is to increase compliance and and shock resistance.
IRM-6C (catalog numbers RPX-10)
Here is some information about this cartridge:
| Type variable reluctance |
Output Voltage 11 mV |
Frequency Response 20Hz - |
Tracking Force 28.5 grs |
Mass |
| Channel Separation |
Channel Balance |
Load Impedance |
Output Impedance 300 ohms |
|
| Stylus |
Stylus Tip various spherical 3mil |
Cantilever |
Dynamic Compliance 0.87 x10-6cm/Dyne |
Static 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 ....
The patent 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.
Condition: MU METAL Body with orange lacquer coating. DC Resistance 270 Ohm.
Body in perfect condition, stylus bar clean and straight. Stylus seems to be missing
Stylus is not user replaceable but could be handled by a professional retipper.
The two terminals at the back have been broken off to fit cartridge in a headshell in the past. There is enough left of the terminals to solder new leads.
Otherwise untested.
Pls check more cartridges and phono items in my other auctions.
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 package.
Pls check more turntable and phonograph items in my other auctions.
All items will be safely packed to avoid any damage and promptly shipped.
Thank you for your interest, and enjoy!
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