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Model H date / serial number info...


thejohn

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Hi all,

I have just aquired a pair of Model H's. Looks like H-M25-12 and serial numbers 7B02 & 7B03 (see attached pic). These numbers don't seem to correspond to the Klipsch model number coding as far as I can see. They look like MDF cabinets with a wood veneer. I'll post some more pics later.

Anyone able to shed any light on these?

Thanks,

John

post-34393-1381943608957_thumb.jpg

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1964 Heresy's, at that time called model H (in 1967 they called them H-700); as far as the M25, it should be maple. The 25 probably is a code for the finish (either "raw", oiled or lacquered); most likely raw/ plain or oiled. The 12 may refer to either the woofer size or the the grill cloth color. Most likely it's the grill cloth. Very little data on the additional suffix codes used at that time.

They should be either "lumbercore" or plywood. Most likely lumbercore as they have a veneered finish.

See this link for the data: http://forums.klipsch.com/forums/p/103886/1048788.aspx#1048788

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H700 series began when the 700 midrange horn lens went into the H model. A couple of crossover network changes occurred after that, with the E-type being settled upon a few years later. Look at his midrange horn lens in the picture, you can see it is much smaller than H700 and later Heresy model mid-horn lenses.

The H-model was originally just a supplementary speaker for the K-horn main speaker in a monaural set-up, but so many people were buying pairs of them for use as main stereo set-ups that PWK did a redesign of the driver/horn array and crossover network which gave the H model more midrange presence and bottom end, so that it performed better as a main speaker, and the H700 model was the result.

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1963 is probably right. My estimate for 1964 was based on the Cornwall's & La Scala's used "A" 1963 and "B" for 1964; the first Cornwall to use a letter code was 3A09, shipped in August of 1963. From what data I have, "H" also used "A" through August of 1963 and then "B" through 1964. The key is probably the woofer driver if it could be identified with an Electronics Industry Association (EIA) manufacturing date code. EIA never assigned Klipsch a "code" as the drivers were outsourced and identified by Klipsch with the code stamp indicating the manufacturer. The woofers are generally where the actual EIA code is often found.

They do look very minty and are certainly a collector's item!!!

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H700 series began when the 700 midrange horn lens went into the H model. A couple of crossover network changes occurred after that, with the E-type being settled upon a few years later. Look at his midrange horn lens in the picture, you can see it is much smaller than H700 and later Heresy model mid-horn lenses.

The H-model was originally just a supplementary speaker for the K-horn main speaker in a monaural set-up, but so many people were buying pairs of them for use as main stereo set-ups that PWK did a redesign of the driver/horn array and crossover network which gave the H model more midrange presence and bottom end, so that it performed better as a main speaker, and the H700 model was the result.

Dang, I LOVE these 'what begat what' stories. Thanks for stopping by Andy, keep on posting mang!

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CP1: We never were able to figure out the early additional suffixes if I recall. You could be right!!! That #25 could also be a "long lost" cloth code? If so (and we can find another pre-65 or so Heresy with an intact sticker, it would be an important addition to the Codex Klipschus....

According to Trey's "timeline", prior to 1967 when they decided that the H-700 would be in a 12" woofer configuration, you could apparently get either the "12" or an 8" woofer in your "H". The timeline data however regarding that choice supposedly did not extend past 1959. But even though the choice ended in 1960, maybe the stickers were still labelled with "H-X##-12" But then again.... to put this mystery in perspective.... Remember when we tried to sort out Cornwall-I's from Cornwall-1.5's.... and ended up with about 4 variations!!! LOLOL!!!

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Thanks guys, great info here. I figured things might be a little confusing from back then.

I didn't think there was mdf back then but the inside of the cabinet doesnt look like a wood venneer, it is smooth and brown like the surface of mdf or hdf - no grain. Also there is no serial number stamped into the rear top plate - is this usual for H's?

Yes the tweeter horn is chrome...

Any ideas on the Type 4 crossover? I only see refence to Type C, E etc.

They are in good nick, apart from a couple of marks on the lacquer finish and certainly don't sound 45+ years old! I reckon I got a bit of a bargain...

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do NOT tell us you paid $25 for them in a yard sale.

Please refrain from making any changes with regards to the bass until we can get things sorted out. There may be some cabinet leakage but don't get in their with caulking gun until our experts confer.

I'd hate to change the woofer out and lose the originality of the unit. You have a bit of rarity there. Is there any other markings on the woofer? Could it be an EV 12W?

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Ha ha, not quite. I'm in South Africa and bought them from an old guy for the equivalent of about $60... He advertised them as "Klipsch speakers in big heavy wooden boxes - old but in good condition". Guess he didn't know quite what he had.

I wont be butchering them, don't worry. I love classic old hi-fi so they'll just join the collection. I'll dig out a leak stereo 20 later - I think they may go well together... I actually really like the way they sound as they are. I was watching Eric Clapton's Crossroads 2007 Guitar Festival DVD earlier and they rocked...

No other markings on the woofer. No suffix, just K22 and the serial number. Later I'll open the other one and double check.

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those appear to be stamped steel frames Bill.

There is an EV that was usually in white cast 4-spoke basket that I've seen in the Runt LS speaker in Hope. That same woofer was used in a lot of cabinets of the day. I'm off on the model number but would bet that its an EV of some sort.

Marshall, in my research I think the only Jensen used was the P15LL, which is in my 1963 CW's and was used in that era. But only the 15 Jensen to my knowledge. But then I've been wrong before.

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