mustard cap date code question

TJB · Post by **TJB** » Sun Apr 24, 2011 9:05 am

Just wondering if there is a chart for looking up date codes on nos mullard mustard caps so I can figure out the year of manufacture and for matching. If no chart is availible can someone explain how to read the date code? Thanks, TJB

neikeel · Post by **neikeel** » Tue Apr 26, 2011 3:08 pm

The letter on mustards is the year quarter A=jan, feb, march, B=april, may, june etc

The number is the year code, so B8 = 2nd quarter 1968.

TJB · Post by **TJB** » Tue Apr 26, 2011 4:24 pm

Hmm, If that is correct, I have a .1uf/400v that reads 22P so that would be.....????
22P does not jive with your expaination.

neikeel · Post by **neikeel** » Wed Apr 27, 2011 5:50 am

http://www.vintageamps.com/plexiboard/v ... f=1&t=2871

Post 1970 they used the 22P 33P type codes, not sure of exact interpretation.

arledgsc · Post by **arledgsc** » Wed Apr 27, 2011 9:57 am

Post 1970 they used the 22P 33P type codes, not sure of exact interpretation.

This is a wild guess but after 1970 they used a number instead of a letter in the first digit to distinguish the 1960 decade from the 1970s. So, 22P would be 2nd quarter 1972, 33P would be 3rd quarter 1973, etc. I haven't seen any date codes that contradict this but again wild guess. P is likely the factory code. Scott

axeman · Post by **axeman** » Mon Aug 17, 2015 11:07 pm

neikeel wrote:http://www.vintageamps.com/plexiboard/v ... f=1&t=2871

Post 1970 they used the 22P 33P type codes, not sure of exact interpretation.

Did all Bianchi Caps come with codes?

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mustard cap date code question

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