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sa660
03-05-2006, 02:37 PM
I just bought the following diaphragm from an old company.

Here are the descriptions:

3 x 12348 replacement cone for LF 2080
1 x 51034 Replacement driver HF
2 x 27061
1 x Maxer (12") no other info.

The 51034 is an RCA replacement for 2774 HF driver
Do someone knows the 2774 high frequency driver?

Can some one help me identify the last 2 model number/make?

Steve Schell
03-06-2006, 09:04 PM
I am familiar with most of the old RCA compression drivers; don't know the 2447 though. I don't know the diaphragms by part number. If you could provide pictures of the diaphragms and measurements of the voice coil inner diameters, I could hazard a guess as to the drivers they might fit.

sa660
03-08-2006, 03:34 AM
Detail on the diaphargm are 172607/501

MI-9448
04-04-2006, 09:05 AM
Mr.Schell is right.without a little bit more detailed info it would be hit or miss at best.If the coil measures a shade under 3.0" and the four brass screws holding it together are just a bit tapered,It's a good bet it will fit ME!! That is,It will fit an MI-9448,9584,9458,etc. Has to be worth somthing! There seems to be a renewed interest in these and also alot of them are surfacing lately. Charlie MI-9448
P.S. Steve,johnathan was really happy to get those MI-1428's from me!He seems like such a nice guy thats why I didn't inflate the price.It's nice to see old gear get a new lease on life.They just weren't my cup of tea.I'm a 175 type of guy at heart!

Steve Schell
04-04-2006, 04:53 PM
Thanks for the pictures, sa660. That diaphragm looks like it will drop right into most any postwar RCA theatre driver, including MI-9448, MI-9458 and several versions of MI-9548. I agree with Charlie, all these RCAs are becoming popular and the prices are rising for them on ebay.

Charlie, I'm sure that Jonathan will take good care of those 1428s. We think the world of this driver, and folks who have a first listen are quickly converted.

sa660
04-19-2006, 01:59 AM
RCA voice coil is 3" diameter and about 3/16 deep