Mallory date code ?

If I'd have to guess, Hank, I would say that cap was made in the 12th week of 1981. That's according to the last 4 digits.

James

On Mon, 22 Sep 2008 16:37:00 -0500, "Henry Kolesnik" put finger to keyboard and composed:

I have three screw terminal Mallory caps with the following markings:

MALLORY MADE IN U.S.A TYPE CGS 30000MFD 15VDC POS + 85C MAX SURGE 20VDC 95661319 235-8102K

MALLORY MADE IN U.S.A TYPE CGS 29000MFD 15VDC POS + 85C MAX SURGE 30VDC CGS293U025R4C3PH 235-8532K

MALLORY MADE IN U.S.A TYPE CGS 21000MFD 16 VDC POS + 85C MAX SURGE 20 VDC CGS213U016R3L 362 8906 56699

They all date from around the early 80s.

Here they are pictured among Sprague caps of the same vintage:

I'd say that 8112 is a YYWW date code.

- Franc Zabkar

It is a YYMM date code. I have several pieces of vintage medical electronics equip, and the date codes on the Mallory caps all match closely the date codes on other parts.

"> MALLORY

This one is from Feb 1982 - and it's Kosher too. ;-)

Remember Sprague's motto? Don't be vague, ask for Sprague.

a little levity . . . very little . . . Regards, Tom

On Tue, 23 Sep 2008 18:24:47 -0400, "hifi-tek" put finger to keyboard and composed:

Then how do you account for the "32" in "235-8532K"?

Here are two more caps, with date codes of 7945 and 8102:

MALLORY MADE IN U.S.A CGS591T200R3C3PL 590MFD 200VDC POS + 85C MAX SURGE 250VDC 1014861-00 235-7945K

MALLORY BIONOL CAPACITOR 6MFD 660 VAC 60 HZ NO PCBS 95686701 37NB6606 PROTECTED C 200 AFC 64591 PTD 8102-1

- Franc Zabkar

Franc Zabkar a écrit :

It IS YYWW (that is year and week) so....235-8532 means 1985, 32nd week. That is why the K is there...

Syl

I agree that it is YYWW, but I don't understand what you are saying the reason is that the "K" is there? Why is the "K" there?

weeK, to avoid any possible confusion to the date format used.

Syl

I have two that have the code 235-6039H. Looks like the 39th weeH of 1960.

That's where I figured you were headed with the "K", but typically the YYWW date code, as used on semiconductors for example, is used without a format indicator, in fact IIRC some versions of the YYWW date code scramble the digits in one way or another to obscure their meaning.

I wonder if the "K" might not have another meaning, such as a code to indicate which of several factories the device was produced in? If that is the case, the fact that "K" is the last letter in "week" might just be a coincidence.

the

I'm pretty sure it is a coincidence. I have only ever seen such indication on some Philips equipment where the letters KW (kalenderweek, kalenderwoche) are printed in front of a 3 or 4 digit code. Every single other piece of equipment I ever saw with such a code only has letters with another meaning in front of or after the date code.

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Could well be but so far only found K and was told so.

I was also told the first 3 digits where the factory ID, can anyone confirm this?

Q: to OP. What country of origin is the cap from? Could it be a code for country of origin? Like Canada, US...

Syl

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I used to make a living selling P.R. Mallory the 3 digit code is the manufacturer, 274 is/was RCA. And 235 is/was Mallory. Ole P.R Mallory used to snap up companies like RMC and Duracell. When he retired they started selling off all those companies.

n8zu

Now, Mallory (Capacitors) is owned by Cornell Dubiler.