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JRH

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Everything posted by JRH

  1. The serial numbers on drivers and horns were not documented to my knowledge. Without a bass bin number (that could also be hammer-stamped into the wood) I would guess late 50's.
  2. These shipped 2/4/75. They are a "mis-matched pair", as both are designated "R" for right. Unfortunately, some dealers were not always careful to get the grain-matched pairs sold as pairs.
  3. 21T174 shipped 8/10/79 to Stereo Systems, Inc. I would not change the oil-filled caps unless they are leaking oil (or if you measure them to be off-spec). DF is very low.
  4. There might be serial numbers "hammer-stamped" into the edge grain on the backs. Otherwise a pic of the guts could provide some clues.
  5. 17W757 and 758 shipped to Ideal Acoustics on 3/6/81. There is a notation in the logbook: "Wild Grain".
  6. The numbers do not make a lot of sense. My guess would be an early Heresy with a 12" woofer.
  7. Assuming they are Cornwall's, they shipped Dec. 7, 1970.
  8. #1237 shipped Feb. 12, 1958 to Better Listening Studio in St. Petersburgh. It was one of the first to use the T35 tweeter. It also had the Stephens 103LX2 woofer and a University SAHF squawker.
  9. 167 means the 167,498th Heresy built, minus 100 (the first serial number was 101).
  10. As far as I can tell, the Rebel design began in 1949, and the product debuted in 1950. Only the Rebel 1 enclosure provided an actual horn behind the driver, with the 3 holes pictured forming the "back side throat". Paul quickly discovered that "porting" the enclosure with a slot at the back of a simple enclosure performed as well with a whole lot simpler construction.
  11. I am not aware of any "authorization" or licensing of the Heresy to anyone. The Texas company referred to could have been Frazier. Paul and Jack Frazier communicated regularly, and both had respect for each other. The yellow button did not apply to this competitor! The Heresy did not (at least at that time, or maybe even now) contain patent-protected elements, so outright copying could have occurred. The trade-marked term Heresy would be another matter, as "trademarks are forever".
  12. Paper logbooks only go back to the early 80's, so no definitive conclusions can be made. However, K&A had a thriving business with the military base PX's in Europe. And my understanding is that the pricing was favorable to the servicemen. I suspect the military's margins were low. Attached is a pic of PWK in Europe from the 80's.
  13. To be clear, there was not a "Stephens squawker horn". What I see pictured is not close to stock, other than the possible re-use of the top and bottom horn flares. The K-5 did go thru some modifications, significantly the early elimination of the "boats". There were also various throat adaptors available to accommodate different drivers, including the Stephens.
  14. Admittedly this could be quite the project if maximum authenticity is desired. I believe I could supply a circuit design (2 or 3 component values). It would then require you to find vintage components and actually build the network. As for the horn, making one of these would truly be a retirement project. PWK's greatest manufacturing challenge was the process and equipment to make these horns. Patience should result in finding one online. If the driver adaptor does not fit the Stephens 108, I probably have one at home!
  15. Early two-way crossovers are mostly a mystery. The logbooks make little, if any, mention of crossovers used. In the very early days, people would send in their own drivers to be utilized, including the WE555! Crossovers were likely custom-tailored in these situations. In Sept. 1951 PWK sent "upgrade parts" to Armstrong as pictured. The three-way 500-5000 series began at least as far back as 1953. The Type 1 started 1/1/64, and was quickly followed by the 1R (initially for -3dB tweeters, but became standard in 1965). The museum's collection has only one that appears to be a two-way (pictured). In the case of #193, I would get vintage components like pictured, and do a simple 6dB/octave centered at 500Hz. (I know people who can do this!)
  16. You may also email info@klipschmuseum.org, or jim@klipschmuseum.org.
  17. I am available to discuss restoration at: jim@klipschmuseum.org!
  18. Finally joining the conversation! My first guess would have been the Dope From Hope collection. However, the "size recollection" sure fits his pocket notebooks, of which there were many. The code mentioned above would have at least covered his bowel movements! Unfortunately the Museum did not end up with these. I am not aware of anything else that would fit the bill, but it never ceases to amaze me what surfaces in our largely unexplored archives. Hoping to get them accessible this summer, so I can resume exploration!
  19. You have hit the jack pot! #193 was shipped Nov. 15, 1950 to Major Edwin H. Armstrong in NY, NY. Yes, the inventor of FM radio, and a friend of PWK's. It had the Stephens 108 HF driver and a Stephens P-15LL woofer. Congratulations!
  20. It is unusual for PWK's signature to be present during this time period. Both were shipped to Hess Recorder Company on July 15, 1963.
  21. 344 and 345 shipped Feb. 27, 1962. Had K-22/K55v/K77/WR drivers and networks. Portus Gilley entered the logbook data.
  22. Magnet structure steel plates are typically plated with a "zinc chromite" plating. I know of at least clear, yellow, and black. There is no difference in magnetic performance, and the change might have been "environmentally" influenced.
  23. The K-77 was an alnico magnet (round structure) until converted to the K-77-M "mud magnet" (rectangular ceramic) in the late 70's. There SHOULD BE no differences during it's life time.
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