[BR-9 amplifier questions]

On 5/17/2014 at 12:09 PM, murray said:

$US 46.20 with tax. www.circuitshop.com, Caledonia MI.

 

Wound new voice coil per old one (I get about 3.8 ohms DC measurement on new one), replace cone (paper with felt dust cap), spider, etc., & Litz wire leads to voice coil terminals pressed into the metal frame. Shop said the 240 part of mfr/date code would have to be 40th week 1942 since permanent magnet speakers had replaced field coil types by 1952.

 

I didn't think the BR-9 was made as early as 1942, so maybe the speaker isn't original (older). I'll have to look for other component date codes but I can't quite reach the amp at the moment. I took lousy blurry pics with my phone.

 

[BR-9 amplifier questions]

The Jensen speaker code of 220240 would indicate a date of 40th week of 1952. EIA source/date codes were not instituted before the end of WWII (1945). Many field coil speakers were used thru the mid-'50's.