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About Martin

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    Southern CA
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    Early music, J.S. Bach, vintage hi-fi.

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  1. Martin

    Unusual Dynacos

    Yes, the A-25 VW was a great one and was untouchable at its original low price. Looks like you are ready to set up a stacked pair.
  2. Thanks, Rick. It may look the same as an A25 woofer, but it's actually 15 ohm, rather than 8, so it's not common. As of this afternoon, I think I have identified the problem: loose, rattling terminals which I can fix.
  3. Anyone have a spare woofer for a Dynaco A50? One of mine is suddenly misbehaving.
  4. The Philips mids' surrounds were always porous & don't need sealant.
  5. Where are you located? I think I have one complete spare.
  6. Those 4 little cone tweeters in the Rectilinear III really do sound good together. My various past experiments with other cone & dome tweeters never quite equaled the originals. Beware those holes are small & will need to be enlarged to fit most other tweeters.
  7. Martin

    Unusual Dynacos

    I didn't get very far either when searching for USS. I do recall that this same tweeter was used by other manufacturers, including, I think, McIntosh. Anyone who felt shortchanged by owning this American-made A-25 need not feel bad as it sounds great, even without the Seas drivers. I've never confirmed this, but I think these same drivers were used in at least some A-25VWs which were the cheaper, vinyl-clad version, that were introduced after the original A-25 became very popular. They were not as elegant with vinyl cabinets & dark grill cloth, but they sounded great & were priced to compete with AR 4x, AR 7 & KLH 17, all formidable competitors, but IMO, no match for the A-25. Most A-25VWs I've seen used a very different-looking tweeter that had an orange-colored dome. I bet these 2 tweeters were otherwise very similar.
  8. Martin

    EPI 100 Restoration

    Thanks for a great restoration post on a great speaker that doesn't get enough recognition.
  9. Martin

    KLH Model Twenty

    Nice work! Has anyone actually measured the impedance of a KLH 20 to see if it is different from that of a 17? Perhaps the woofers are different even though they look the same.
  10. Very nice job. Your ingenuity & creativity are admirable.
  11. They're not Corals & they have absolutely nothing in common with any ARs or M&Ks.
  12. Thanks for this recommendation, Kent. I think I'll try it, too.
  13. Love your vivid recollections, Frank. NYC in the '60s was hi-fi paradise. As for the mystery speakers, they are either homemade as Frank suggests or more likely, could have been bought inexpensively as ready-made at one of the many small, less-exclusive, hi-fi/electronics shops that were all over the place back then. The Calrad-branded crossover is the tipoff: Calrad distributed inexpensive, usually Japanese, parts and finished products including small speaker systems, small hi-fi amplifiers, microphones, PA system components, etc. Calrad products were widely sold by small electronics shops including Gem electronics in the NY Metro area, a favorite haunt of mine as a kid.
  14. AustinJoeC: Yes, that "protective mesh" was not very protective. I have never succeeded in adequately repairing the damage done once it's been pushed in. All tweeters I've heard in that condition distort, sometimes badly, even after attempts to repair. You seem on the right track, but your biggest problem will not be with the speakers themselves, but will be with insufficient amplifier power, assuming that you will want to play them loud. Remember that you often can cause more damage with too little power rather than with too much and the resulting distortion can be hard on your tweeters. You might consider using appropriate fuse protection. The stacked Advent idea was a response to the already-popular practice of stacking Dynaco A-series loudspeakers. Dynaco included a detailed stacking instruction sheet with every pair. A very important difference was that the impedance of two Dynas in parallel never dipped low enough to cause trouble. Not so with Advents! FWIW, I've been using stacked Dynas since 1970 and have never had any problems except for complaints from neighbors.
  15. Great film! Not sure we've progressed much in 60 years. Loved the Garrard 301 & Quad pramps.
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