RCA 5 Inch Military Fullrange Drivers

thetubeguy1954 · 2nd October 2008, 04:30 PM

I've recently obtained a pair of fullrange 5 in RCA ---{or more correctly unlabled RCAs}--- that were used by the US Military. These are actually very heavy, phenolic drivers that I found to be very interesting looking (see photo) Does anyone have any info on these drivers? Are they as good sounding as they are reputed to be? Any input would be appreciated.

My friend is sending me a pair of his own DIY design enclosures called the Angel. They're a corner horn loaded enclosure and I'm getting them for FREE out of Canada for me to try these drivers in. Of course we both realise it will be hit or miss but, at least it's a starting place....

Thetubeguy1954

Rational Subjectivism. It's An Acquired Taste!

planet10 · 2nd October 2008, 05:35 PM

Well they certainly have a basket that i have also seen on Asian drivers i usually attribute to Coral -- what are the numbers on the driver?

dave

jackinnj · 2nd October 2008, 05:46 PM

Phenol is a powerful anti-fungal -- pretty good for a simple benzene ring with a hydroxyl attached. Phenolic resins seem to have some antifungal properties surviving the process whereby they are turned into a thermal setting plastic.

thetubeguy1954 · 2nd October 2008, 05:50 PM

Quote:

Originally posted by planet10
Well they certainly have a basket that i have also seen on Asian drivers i usually attribute to Coral -- what are the numbers on the driver?

dave

Dave, they might well not be RCAs. I only know they were sold to me as fullrange drivers and look just like the fullrange RCAs drivers I've seen on eBay ---{at least from the front that is}--- I'm at work right now, so when I get home tonight I'll post the numbers that are on the back of the magnets.

Oh another note I should be sending you those FE206ES-R's soon for you to work your magic on them.

Thetubeguy1954

Rational Subjectivism. It's An Acquired Taste!

planet10 · 2nd October 2008, 06:20 PM

Quote:

Originally posted by thetubeguy1954
Oh another note I should be sending you those FE206ES-R's soon for you to work your magic on them.

thetubeguy1954 · 3rd October 2008, 11:20 PM

Quote:

Originally posted by planet10
Well they certainly have a basket that i have also seen on Asian drivers i usually attribute to Coral -- what are the numbers on the driver?

dave

Dave I had a horrible migraine last night so I didn't get around to getting the #s off the back of the drivers like I said I would.

Tonight I'm feeling much better so here's the #s I said I get for you. There are actually 2 different #s on each driver. On the top row is the # H306 and on the row just below it the # is: 575219. Both drivers are marked exactly the same way, with the same #s.

If these #s reveal anything about the driver's manufacturer please let me know who actually makes them, ok? Thanks Dave I appreciate your help.

Thetubeguy1954

Rational Subjectivism. It's An Acquired Taste!

planet10 · 4th October 2008, 12:42 AM

Quote:

Originally posted by thetubeguy1954
575219

Made by Hepner, the 21st week of 1969 (or less likely 1959)

dave

GM · 4th October 2008, 03:05 PM

It's my understanding that in a three digit code the first number refers to the year with the last two being the week, which FWIW is what is stated here and here, making it the 19th week of some year ending in '2', so I'm curious if you have something more definitive on the subject.

TIA,

GM

badman · 4th October 2008, 03:41 PM

Quote:

Originally posted by planet10

Made by Hepner, the 21st week of 1869 (or less likely 1959)

dave

I'd say it's much more likely that it was 1959, though 1969 may be more likely still

Cal Weldon · 4th October 2008, 04:32 PM

Quote:

Originally posted by planet10
1869

typo?

2nd October 2008, 05:35 PM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Well they certainly have a basket that i have also seen on Asian drivers i usually attribute to Coral -- what are the numbers on the driver? dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

4th October 2008, 03:05 PM	#8
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	It's my understanding that in a three digit code the first number refers to the year with the last two being the week, which FWIW is what is stated here and here, making it the 19th week of some year ending in '2', so I'm curious if you have something more definitive on the subject. TIA, GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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2nd October 2008, 05:46 PM	#3
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Phenol is a powerful anti-fungal -- pretty good for a simple benzene ring with a hydroxyl attached. Phenolic resins seem to have some antifungal properties surviving the process whereby they are turned into a thermal setting plastic.

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