Partridge Date Codes?

HIWATT amps from the Hylight Electronics era

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Alnico
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Partridge Date Codes?

Postby Alnico » Thu Nov 13, 2008 12:25 pm

I threw this hypothesis up on the PP forum a while back. It appears to me that the bottom number on Partridge transformers is some kind of date/batch code (the top number being the part number).

'60s tranny codes begin with G, '70s with H, then the first numerical digit is the year. This seems to hold on most amps I've looked at, including Sound City, Laney & Orange Matamp.

Examples (amps dated from other components e.g. mustard caps, pots, filter cans):

'67 DR506 code G7807
'68/'69 SC 100 Mk3 G8543 & G8544
'69/'70 DR103 s/n 727 codes G9486 & G9487
'71/'72 Laney Supergroup H1947 & H1948
'72 Laney 60W H2574
'80 DR103 H9683

Now here's one that throws a spanner in the works - my DR103 s/n 1489 which we just decided is 1970 has H1037 and H1038... very early '71 after all?

Does this seem reasonable, or am I barking up the wrong tree? :?:
'67 DR506 s/n 162
'68 DR504 s/n 424
'69 DR504 s/n 675
'70 DR103 s/n 727
'71 DR103 s/n 1489

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Dr.HI-TONE
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Re: Partridge Date Codes?

Postby Dr.HI-TONE » Thu Nov 13, 2008 12:36 pm

It does seem intuitive.
I will have to go through my amps and record the tranny #'s

Maybe we can prove your theory and have another valuable tool!
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OldSchoolDave
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Re: Partridge Date Codes?

Postby OldSchoolDave » Thu Nov 13, 2008 12:42 pm

There are a lot of transformer codes listed in Mark's Registry:

http://mhuss.com/Hiwatt/RegAmps.php

Someone who's got time and interest could populate a spreadsheet with that info for starters.

Dave
...Hey! I played that song when it was new...

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Dr.HI-TONE
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Re: Partridge Date Codes?

Postby Dr.HI-TONE » Thu Nov 13, 2008 2:58 pm

I skimmed through Mark's registry and the theory seems to hold.
http://www.HI-TONE-Amps.com

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Mike B.
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Re: Partridge Date Codes?

Postby Mike B. » Wed Nov 19, 2008 4:13 pm

Ahhh...a theory!

I shall organize a symposium at once.

Mike
Living for Theory Since 1955
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Alnico
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Re: Partridge Date Codes?

Postby Alnico » Wed Nov 19, 2008 9:08 pm

I think it has to remain a hypothesis until it's proven? I could be wrong though, I often am... :|

BTW, I noticed Ian Frankish's (PP member) set, which he custom ordered from T&R (as they are now) are coded K8xxx. If they skipped I for the '80s and used J, could be those were made in '98? I wonder when he bought them?
'67 DR506 s/n 162
'68 DR504 s/n 424
'69 DR504 s/n 675
'70 DR103 s/n 727
'71 DR103 s/n 1489

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Dr.HI-TONE
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Re: Partridge Date Codes?

Postby Dr.HI-TONE » Wed Nov 19, 2008 9:10 pm

I believe you are correct. my earlier post should read, "your Hypothesis seems to hold!"

:lol:
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Re: Partridge Date Codes?

Postby Dr.HI-TONE » Sun Dec 21, 2008 6:19 pm

after further review, I have found some discrepencies...........so I have to revise my opinion to uncertain.....

:?
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Alnico
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Re: Partridge Date Codes?

Postby Alnico » Sun Dec 21, 2008 6:39 pm

Care to elaborate?
'67 DR506 s/n 162
'68 DR504 s/n 424
'69 DR504 s/n 675
'70 DR103 s/n 727
'71 DR103 s/n 1489

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Re: Partridge Date Codes?

Postby Dr.HI-TONE » Mon Dec 22, 2008 6:35 pm

I have seen a handful of amps that certainly seem to be original and authentic that don't seem to follow suit.

A huge percentage do follow suit, but some don't.

shrugs shoulders........... :?
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Re: Partridge Date Codes?

Postby Dr.HI-TONE » Wed Sep 09, 2009 11:47 pm

I have not forgotten this thread or Hypothesis.
The only discrepencies seem to be with the year 1970.
G9 seems to go directly to H1

I do believe this hypothesis to be valuable..........I would rely on it 99% of the time.

Only time and more HIWATTs will tell...........
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HI-TONE, when only the best will do.

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Johnny.T.
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Re: Partridge Date Codes?

Postby Johnny.T. » Thu Nov 26, 2009 3:10 pm

My #249=1968 yet my Partridge code is G6469 suggesting 1966,any ideas?.

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Dr.HI-TONE
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Re: Partridge Date Codes?

Postby Dr.HI-TONE » Thu Nov 26, 2009 3:14 pm

Exactly!
I believe your amp to be a 1967 rather than a 1968.
Very nice!
Glad you found The Vintage HIWATT Forum!
http://www.HI-TONE-Amps.com

HI-TONE, when only the best will do.

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mhuss
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Re: Partridge Date Codes?

Postby mhuss » Thu Nov 26, 2009 5:46 pm

You can also refine the date of manufacture further by checking the pot and cap date codes, as shown here:
http://mhuss.com/Hiwatt/dates.html

--mark

stokekt88s
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Re: Partridge Date Codes?

Postby stokekt88s » Mon Apr 04, 2011 10:41 pm

my dr203 trans are h2 and it has 72 caps in it also the theory works in this instance.


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