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#2
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In article ,
KLR wrote: With the AMI - the adjustment is possible to have so that the record doesnt touch the magazine guides when replaced. This is tricky to very tricky on some machines, but really worth it. It also helps ensure good loading and unloading of records.... As for the turntable - the record is not "held" onto the spinning turntable - but is actually held in the gripper slightly above the turntable - and then dropped (about 1/32" or so) to the surface. Yep. Another adjustment that when it's right makes the machine nice on records. It takes effort, but it's worth it. The same happens when picked up - it is raised quickly and replaced. Really quick on my F! I think I might put a resistor in there to slow it down a tad - it's VERY fast right now... The same comments on the turntables and grippers would also apply to rock-ola. Magazine rack is not as good though as I feel the gaps are wider and the recards seem to "rattle" round a lot during rotation which cant do them a lot of good. Also many rock-olas have a stainless steel strip underneath the carousel to stop the records falling out and they scrape along this strip (edge though) as the thing turns. AMI uses a belt and pulley arrangement to stop this happening.. *misc grumblings about rock-olas deleted* Actually, my 1493 slightly tilts the recors in the rack to promote easier sliding as they go around. Needless to say, removing and polishing the hell out of that strip is a good thing. In any case, it gets the edge, which isn't a biggie. Older Rock-Olas used a rack belt, and even older ones used some weird thinge. Seeburgs are good on records - they push from the edge and clamp in the center. Wurlitzers are like this too, actually, Wurlitzers I don't think really touch the records anywhere else. This is the 50's type, the stack types generally murder records if you don't use support discs, the later type I have no idea. 78rpm AMIs converted to 45 don't touch the record anywhere but at the edge where the ring grips them, and the center hole. A touchy setup, but really cool once it's working right. You REALLY have to adjust the hell out of them, but they do work amazingly well once they're adjusted right. -- To email me, chage 'usermale' to 'usermail'. |
#3
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The same happens when picked up - it is raised quickly and replaced.
Really quick on my F! I think I might put a resistor in there to slow it down a tad - it's VERY fast right now... Hmm, the E had a 20 ohm resistor in series with the gripper motor.... not sure about the F Have you replaced the old selenium rectifier with a silicon bridge? This tends to give you a bit more zip... Cheers, Don Oregon Jukebox --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.489 / Virus Database: 288 - Release Date: 6/10/03 |
#4
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In article ,
"Don Lanway" wrote: Have you replaced the old selenium rectifier with a silicon bridge? This tends to give you a bit more zip... Oh yes it does..... It's the fastest AMI in the east now! Seriously, this thing *flings* the record out faster than you'd imagine. I know they were 'crisp' when new, but this is a bit too fast I'll probbably put another resistor in there to just hold the line down a bit - it's around 35 - 40 V at times. I'm not sure if you can still get the type of selenium used in these things - I DO know as a fact (because we use them at work), that seluniums ARE still made. -- To email me, chage 'usermale' to 'usermail'. |
#5
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"Philip Nasadowski" wrote I'm not sure if you can still get the type of selenium used in these things - I DO know as a fact (because we use them at work), that seluniums ARE still made. They have their place, like everything... it's my impression that they handle spikes, overloads and heat better than silicon rectifiers... but I could be wrong. My Dad still has a Lincoln welder with a huge selenium stack in it... 100% duty cycle, 400 amps, at about 30VDC... of course we never push it that high... 1/4" 6018 rod runs smooth as butter though! Built in the fifities, must be over five hundred pounds of copper and steel laminated core in that baby, LOL! Hmm, trip down memory lane... um.. oh yeah! Welded up a part for the old man's wurlitzer with it! Just to keep it kinda on topic... --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.493 / Virus Database: 292 - Release Date: 6/25/03 |
#6
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On Mon, 30 Jun 2003 23:35:21 -0400, Philip Nasadowski
wrote: In article kWPLa.60138$Fy6.17091@sccrnsc03, "Don Lanway" wrote: They have their place, like everything... it's my impression that they handle spikes, overloads and heat better than silicon rectifiers... but I could be wrong. Beats me. We use them at work on MG set elevators (the few MGs we still build, VVVF pretty much dominates traction elevators, at least at the sub 350 fpm end). I don't know why, but we do. They were popular in TV sets and other electronics in the 50's, and much hated because they're smelly when they blow Spikes and overloads? I don't know, though even by the early 60's, Si technology was really getting into high power - the 1963 vintage Budd built Silverliner electric commuter cars for the PRR used 3 bridges with a six pack in each leg, 570V on each bridge, though the one fed by the 'A' winding had a pair of ignitrons (think really big 2050s in front acting as 'voltage vales'. This was feeding 4 150hp motors at up to 1500 or so volts. Not bad... Today's semiconductors are tough. I melted a sample surface mount mosfet off it's heat sink while stress testing it, and the darn thing STILL works. Litterally melted the solder and off it slid... Anyway, Se types work great at low voltages and high currents, IIRC, and ye, they take abuse. There weren't any other good rectifier diodes in the 50's when DC motors styarted popping up in jukeboxes anyway. Hey, while I'm thinking of it, when did AMI switch from a DC motor for the gripper to an AC type that spun in one direction only? Some of the 1950's jukes I have seen the AC motor used. J,K and continental. Have also seen these with DC motors too. Whether these were factory fitted - or swapped round by techs over the many many years since new from later models - I don't know. What exact year I don't know either. As most of these models were made in overseas countries under licence as well - and used locally produced motors in some cases which may have been AC or DC - it makes the issue more unclear still as these parts find their way swapped into US made ones during the life of the machine as well . Rowe went to full AC motor usage in mechanisms starting with the JAL - 200 - and has used them ever since. |
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