•Hi Group, Jerry Hall in (MMD 98.08.14) asked about "The Battle of Waterloo." From his description I believe the title of the piece is actually Beethoven's "Wellington's Victory" (The Battle of Vitoria). I have it on Mercury, Living Presence Sound Series, Stereo LPS 9000, performed by Antal Dorati a...

•Hi roll scanners in MMD, if somebody would like my advice here it comes. (This only applies to discrete opto electronics, not CCD's). There was not much success with reflected light so I use transmitted light. In 1990 I used an incandescent tube lamp because the roll paper would glide softly over t...

•Dear MMDers, This is really a long shot but I am looking for a "mechanical music machine" from the 50's. As a teenager, my wife had an unusual 45 RPM record player and would sure like to find one like the one she had. It was mostly plastic, of course, played only 45 RPM records, was battery powered...

•Having lurked around MMD in silence for a couple of years (and learned a lot), I can't resist raising a small voice on the subject of the Sankyo 20-note player punch-a-tune. I believe this device made its first appearance in America twenty or thirty years ago, when a battery-powered version was mar...

•I once saw a programme on Discovery Channel (probably) about the developments in mechanical hearts, and although this is revolutionary technology, it's still no easy fix like you find in "Star Trek", or something 'elegant' like being a "Robocop" cyborg. The heart must get its power through chords t...

•-- non-subscriber, please reply to sender and MMD -- Dear MMD's, Quite a number of years ago I bought a Tangley Calliope from Mike Hanchett in Newton Kansas. The roll frame feed motor just gave up. The roll frame was made for Mike by George Cooper, formerly, but no longer, of Nevada, Iowa. It is a ...

•Hi Mike. Vern Jones also uses the power MOSFETs in his Sound Research products, as I plan to. Smaller 1/2-ampere MOSFETs are employed in the Octet products to drive high-current organ magnets. But worst-case total current consumption can be higher than you imagine. The Unaphone can also operate in ...

•I don't know if this list does intros or not, but since other lists I am on do so, I will impart a short one. I own a full service antique clock shop in Manassas, VA, just outside of Washington, DC. We do repairs and restorations of old and antique clocks. I, myself, specialize in electric clocks a...

•When I mentioned an electronic chip idea, what I had in mind is a "microcontroller" with internal or external ROM, driving a speaker. There are a number of such devices on the market, e.g., Motorola, Parralax Stamp, Atmel, etc. A Google search for microcontroller should turn them up. One version of...

•There's a single-chip solution, for recording and playback of up to 16 minutes of sound, called ChipCorder, formerly made by ISD (now WindBond). I tinkered with the 30-second versions about eight years ago, and was very impressed with their ease of use and sound quality. You pretty much just add a ...

•Hi All, My sincere thanks to all who have responded to my query about why Pandora and I didn't get electrocuted. Just for grins, I did a little experimenting to discover the normal resistance of "pure water" and salty water. I placed the test probes three inches apart. Here's what I found. Our "tap...

•[ Craig Gockel asked, in 030112 MMDigest: ] > Which side is Line, and which side is Load? If I ever teach electrical engineering again, I'll use this on a test. I'm assuming that the converter consists of an AC induction motor that drives a DC brush-type generator. The device likely has four darkis...

•Thanks, everyone, for your response to the "O" rolls announcement. When digging out the "O" rolls last week, I came across a couple of style "D" Peerless Piano Rolls. Number 5505 (Dat Draggy Rag, My Cavalier Waltz, Battery B March, Spying Cupid Waltz, Rag Time Betty) and number 5768 which does not ...

•Remember these smoke generators often leave an oily residue. Please test elsewhere before placing into automaton. Also the draft and refueling the smoker is a big concern. To work properly, they need to be placed by the outlet. Otherwise you may need an artificial draft and/or access to reload the ...

•I'd like to respond to a couple of statements in Mike McCoy's posting about the PTG. To say that each chapter has their own membership requirements gives a misleading impression of arbitrariness. When you join the PTG you become a member of the _national_ organization, which has uniform requirement...

•I have a problem with the requirement that to be a RPT you have to be able to tune the temperament by ear. This seems to be a prejudice against new technologies. It also means that anyone whose hearing is not up to par can never be an RPT. If I can take a new autostrobe tuner with stretch tables, f...

•1. Most ordinary appliances -- For most appliances you need an autotransformer. These are readily available in ratings from 50W to 1000W and more. I have a couple of nicely packaged units with a flying lead for the input and a USA style power outlet. They are fully reversible too, you can use them ...

•When you buy a new car and drive it off the dealers lot, it loses about $2,000 value, unless you bought a highly collectable car. I have a 1990 Chevy Van that is probably worth only $200. I recently spent about $200 for new tires, $150 for a fuel pump, $475 for a new battery and alternator. I tried...

•Dave Saul suggested, in 031003 MMDigest, "Suppose a pressure sensor were interposed between key and balance rail ..." I suggest a carbon pile resistance-pressure transducer placed between the balance rail and the keyframe. This ancient device, I understand, is still used in the foot pedal that cont...

•Robbie asks the question [040213 MMDigest], "What do antique car owners specify when an old auto is rewired?" The answer is not particularly relevant to the question about whether or not to bring an old 120 volt AC apparatus up to modern standards. The old cars are 6 volts DC. Nobody's going to get...