![]() Aczel owned one for a while, using it to play some second gen master tapes. LNP-2 was a full featured preamplifier-actually it had more features than any consumer preamp at the time, and was sold as a 'front end addition' to Mark's modified Studer A80 tape deck. I believe his circuits were used in the similarly named LNP-2. ![]() Dick also direct marketed what he called a 'low noise preamplifier' advertising it in the back pages of Audio. The device was designed by Richard Burwen- a man who knows more about audio in his deep sleep than I'll ever know in my most lucid moments. I'm not sure if it was a one-off, or an actual product. Might have been in one of the 'industry overview' blurbs. I first came across what I presume to have been a Palette 'prototype' in Audio magazine. To me, its history is, however, interesting in its own right. But that’s my findings and over sight over the years in this hobby.Īnd as far as the micro groove LP, great 1940’s source with important limitations:Ĭlick to expand.I can't speak from first hand knowledge about any of that. One of the 1st point of degraded signal is via this contact. Today, I wouldn’t even be seen without using contactless volume control. ![]() Just sharing my thoughts.Įlector Magazine in the 80s wrote an article on volume pots for studio consoles and identified how unreliable standard mechanical pots were, they published a conversion for volume control pots using contactless OPAMP controls that would support the replacement in certain studio control consoles. Alps pots also transitioned into sealed plastic units to isolate it from the exposed environment for reliability, I hoped this is the case for these? Not only that this one also has different materials that the signal must pass through, and no grease to reduced wear. It looks like 2 contact points, the other is that inner circle trace!!! A normal pot with resistive wafer would use a single contact that is mechanically ganged for reliability, and some would have conductive grease implantations. You can see from the picture where it was most used, it looks like spring leaf contacts too, stand correct if I’m wrong, the intent was good but I doubt it can do better than a normal pot with typical wafer. Can you or anyone weigh in if they owned one care to comment on reliability. Thanks for sharing that image, 1st time I’ve seen a potentiometer implemented this way. Today, I doubt if you can buy ball bearings without a cover! However I never tried! All ball bearings that I replace all comes with seals on both sides. Yes they are ball bearings, probably not critical in this application but I would use bearings with a seal that isolate it from dust. So, nope, I do not miss the LPs a bit, nor the MM or the MC inputs of the dinosaur preamplifiers. ![]() The quality control was poor and inconsistent.) The Empire 298 arm/ Shure V15-III was barely able to track. I still remember my disappointment when I bought the “Trilogy” LP by ELP and found that a rumble was added to the first song, clearly audible every 2 sec through the ppp of the signal at the beginning. Click to expand.And as far as the micro groove LP, great 1940’s source with important limitations:ġ) The very variable quality of different pressings.Ģ) The progressive constant decrease in linear velocity as the stylus would get closer to the center: the first song was reproduced with the best quality, the last on the disc the worst.ģ) Way too dependent on the dust in the environment and very difficult to clean the grooves from itĤ) Very poor stereo separation between channels, at best 25 dB in the bass and mids, 15 dB in the trebleĥ) Noisy surface: the 0 signal parts were audible, very audible in the background noise the created from the friction of the diamond stylus over the vinyl.Ħ) The warps of the vinyl plate (a very, very common occurrence, often not qualifying for a free replacement. ![]()
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