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Help IDing Cornwalls


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Yes 

 

  • FREQUENCY RESPONSE (+/- 4 dB) 34Hz - 20kHz.
  • SENSITIVITY1. 102dB @ 2.83V / 1m.
  • POWER HANDLING (CONT/PEAK) 100W/400W.
  • MAXIMUM SPL. 119dB Continuous.
  • NOMINAL IMPEDANCE. 8 ohms Compatible.
  • CROSSOVER FREQUENCY. HF: 5000Hz.
  • HIGH FREQUENCY DRIVER. K-107-TI 1” (2.54cm) Titanium diaphragm.
  • MIDRANGE. K-702 1.75” (4.45cm) Polyimide.

 

 

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 given they do not have risers most likely  k77 round magnet  (otherwise  Ferrite ),k-600- k55V midrange , K33 square magnet , B network , 

 

 

Frequency Response:

SENSITIVITY: 98.5dB @ 1watt/1meter
POWER HANDLING: 105 watts maximum continuous (1000 watts peak)
NOMINAL IMPEDANCE: 8 ohms
TWEETER: K-77-1" (2.54cm) Phenolic diaphragm compression driver
HIGH FREQUENCY HORN: 90(o)x40(o) Exponential Horn
MIDRANGE: K-55-V 2" (5.08cm) Phenolic diaphragm compression driver
MID FREQUENCY HORN: 90(o)x40(o) Exponential Horn
WOOFER: K-33 15" (38.1cm) Fiber-composite cone
ENCLOSURE MATERIAL: Birch Plywood or Veneered Lumbercore
ENCLOSURE TYPE: Bass reflex via front-mounted port
WEIGHT: 108 lbs.

 

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1 hour ago, PrestonTom said:

 

Certainly, JEM is one vendor, but there are others also. Search the threads.

 

 I did search   ,  1 Dealer supplies klipsch capacitors in the USA  for klipsch Heritage crossovers  ,  that's JEM . 

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1 hour ago, PrestonTom said:

 

Certainly, JEM is one vendor, but there are others also. Search the threads.

 

Yes, there certainly are.  Parts Express, Sonicraft, and many others.

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6 hours ago, jimjimbo said:

Yes, there certainly are.  Parts Express, Sonicraft, and many others.

 

I believe this is the Type B schematic for your Cornwalls.

image.png.dd3fc0f2d36a289f54b9291109c304f4.png

Leave the inductor and autoformer alone, but the 4uf and 2 uf caps are your target. Check the Parts Express website to see what they have. When I have done this in the past I simply used the Solen Polyprop caps. IIRC, sometimes it is hard to find a 2uf substitute, so feel free to use the more commonly found 2.2uf cap. If you want to get fancy then a spend a few dollars more and bypass (wire in parallel) a second cap across the main cap. This bypass cap should be about 1 or 2% the value of the main cap (approximately or even a little less). I like to use a Dayton film / foil as the bypass cap also available at the same website. 

 

There are also other brands to choose from and there are also ways ways to spend even more money (the sky is the limit). 

 

When you refresh the caps, you will notice a bit more energy in the high frequencies. Some folks will offer very flowery language about the "new found" sound. Given the price, it is certainly worth doing. 

 

Good luck,

-Tom

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14 hours ago, jason.justice said:

Thanks.

Assuming these are all original parts from 1979 and Type B network. What are the recommended upgrades to make for these 1979 Cornwall 1? 

Do you have the tools and knowledge to solder?  These are very simple circuits.

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