Early MW 6500 date code
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odcics2
Posts: 309
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That's not a date code. The only dates on vintage Polk mid-drivers were on the paper label.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
Ok, so these early drivers didn’t have a paper label on the backside.
I was hoping the numbers meant something.
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Of course, you're right about the very early ones not having paper labels. For a possible date clue look at the back of the PR as they often hand wrote a date on them. Also, look on the crossover.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
I’ll check a PR.
I’d have to dig out the enclosure to get at the crossover. It’s not the external mounted cup.
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You can access the crossover when you remove the PR.
While you're in there install some real binding posts and get some real speaker cable.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
What do the numbers on the back of the drivers mean if they aren’t date codes?
Some type of internal tracking?
Thanks. -
@mhardy6647 posted info. once about the possibility of them being manufacturer's ID codes.George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Crown D150 amp
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
557 could be Matrecs Industries, Inc. I find it hard to believe that the date could be 5th week of 1962. Maybe 25th week of 1976?
https://www.ecianow.org/assets/docs/EIAStandards/1.7.6_EIA Source Codes_1981.pdfGeorge / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Crown D150 amp
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
Here’s pics of the 8” PR.
No dates on the crossover. It’s the kind that is screwed to the cabinet back. -
I don't know if you saw my previous post to you. I believe the prod. date on your MW's are 25th and 36th week of 1976.
In this thread the person also had a very early speaker and has the same number 6KU132 on his MW and said his passive was 7450 (maybe the last number wasn't stamped well?)
https://forum.polkaudio.com/discussion/161419/matching-my-mismatched-monitor-7s/p1George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Crown D150 amp
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
Nice concentric washer addition to that PR.
Life is like an old set of Polks. Ya never know what you're gonna get, and circumstances are different every time.Don't take experimental gene therapies from known eugenicists. -
Gardenstater wrote: »I don't know if you saw my previous post to you. I believe the prod. date on your MW's are 25th and 36th week of 1976.
In this thread the person also had a very early speaker and has the same number 6KU132 on his MW and said his passive was 7450 (maybe the last number wasn't stamped well?)
https://forum.polkaudio.com/discussion/161419/matching-my-mismatched-monitor-7s/p1
Yes, I did see it, but you said it was a guess. Previous posts say the numbers are not a date code.
I’m just trying to learn, being a Polk new guy here!!
I really like the sound of these early Monitor 7s!!
I’d put spade lugs on the ends of the wires, but other speakers I use have different hook ups.
FYI- barrier strips are an excellent way to connect if using spade lugs.
It’s the preferred way to connect according to Vandersteen.
They tested them all.
$70,000. speakers with barrier strips speaks a lot about the quality of the connection.
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Whatever Vandersteen recommends, do the opposite.
High quality binding posts and banana plugs for me, thank you very much.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
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Gardenstater wrote: »I don't know if you saw my previous post to you. I believe the prod. date on your MW's are 25th and 36th week of 1976.
In this thread the person also had a very early speaker and has the same number 6KU132 on his MW and said his passive was 7450 (maybe the last number wasn't stamped well?)
https://forum.polkaudio.com/discussion/161419/matching-my-mismatched-monitor-7s/p1
Yes, I did see it, but you said it was a guess. Previous posts say the numbers are not a date code.
I’m just trying to learn, being a Polk new guy here!!
I really like the sound of these early Monitor 7s!!
I’d put spade lugs on the ends of the wires, but other speakers I use have different hook ups.
FYI- barrier strips are an excellent way to connect if using spade lugs.
It’s the preferred way to connect according to Vandersteen.
They tested them all.
$70,000. speakers with barrier strips speaks a lot about the quality of the connection.
There was an explanation in the link I gave previously. Here it is. Basically the last 4 digits after the hyphen (yours don't have a hyphen) are the date code. Sometimes the manufacturers leave off the decade part of the year, just to make things confusing or to save a little $ on ink I guess lol.
https://www.ecianow.org/assets/docs/EIAStandards/1.7.6_EIA Source Codes_1981.pdf
George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Crown D150 amp
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
Gardenstater wrote: »Gardenstater wrote: »I don't know if you saw my previous post to you. I believe the prod. date on your MW's are 25th and 36th week of 1976.
In this thread the person also had a very early speaker and has the same number 6KU132 on his MW and said his passive was 7450 (maybe the last number wasn't stamped well?)
https://forum.polkaudio.com/discussion/161419/matching-my-mismatched-monitor-7s/p1
Yes, I did see it, but you said it was a guess. Previous posts say the numbers are not a date code.
I’m just trying to learn, being a Polk new guy here!!
I really like the sound of these early Monitor 7s!!
I’d put spade lugs on the ends of the wires, but other speakers I use have different hook ups.
FYI- barrier strips are an excellent way to connect if using spade lugs.
It’s the preferred way to connect according to Vandersteen.
They tested them all.
$70,000. speakers with barrier strips speaks a lot about the quality of the connection.
There was an explanation in the link I gave previously. Here it is. Basically the last 4 digits after the hyphen (yours don't have a hyphen) are the date code. Sometimes the manufacturers leave off the decade part of the year, just to make things confusing or to save a little $ on ink I guess lol.
https://www.ecianow.org/assets/docs/EIAStandards/1.7.6_EIA Source Codes_1981.pdf
[img]https://us.v-cdn.net/5021930/uploads/editor/i7/h 1vk0a6n8v9i.jpg[/img]
What about the PR numbers?
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I do not know how we decipher the PR numbers for any meaning. 74505, doesn't really compute for me. 7450 could be 50th week of 1974. Shot in the dark, maybe the same passive they used in the Model 9? Question mark is a serious question mark this time.George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Crown D150 amp
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
Ya'll are seriously reaching.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
More confirmation on Matrecs Industries (from an eBay seller)
George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Crown D150 amp
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform
