Half right. The Columbia Lyric reproducer will play both 2 and 4 minute records - but don't try playing a 4 min BA.... you'll end up with a lot of blue dust. They 'like' Indestructible records. The feed screw gearing simply shifts to half speed for 4 minute records (shift left for 4 min, right for 2 min). I've got the 2/4 min gearing on my BKT and can provide some pics if you need 'em, Dan.
Loran On Nov 7, 2004, at 2:32 PM, Robert Wright wrote: > Dan, > As far as I know, there's no real speed mechanism, i.e., something > analogous > to the 33/45 switch on a modern turntable. The difference between 2 > and 4 > minute cylinders is that the 4 minute ones have roughly twice the > amount of > grooves per inch, like the difference between a wood screw (course) > and a > machine screw (fine). I've been in the market for a machine like that > for a > long time but still haven't found the right one for me, so I can't say > for > certain without personal experience, but I believe changing a phono > from > playing 2-minute to 4-minute involves separate reproducer assemblies > (the > piece with the stylus and diaphragm), each being designed to be placed > resting against one of two long feedscrews (like headless bolts that > rotate > with the cylinder, parallel to the mandrel). They also have > differently > sized and shaped stylii specifically ground to play only the > appropriate > cylinders, so I would imagine trying to play a 2-minute with the > 4-minute > setup (or vice versa) would irreparably damage the cylinder. > > I'm sure there are details I've missed here, but these are the guys to > ask, > so I'm hoping for this info to be corrected and/or clarified. (These > are > the guys to ask!) I only spoke up because I was surprised no one else > had. > > Hope you're all having a fabulous weekend! > > Best, > Robert Wright > > > > > ----- Original Message ----- > From: "Daniel Melvin" <d...@old-phonographs.com> > To: "Antique Phonograph List" <phono-l@oldcrank.org> > Sent: Sunday, November 07, 2004 12:30 PM > Subject: [Phono-L] 2/4 setup on a Columbia BFT > > > I have a really nice Columbia BFT that has a 2/4 minute setup. Can > someone > tell me how this mechinism works? I have played around with it and it > doesn't seem to make any difference what I do, the speed doesn't > change. > Thanks for any ideas you might have. > > Dan > _______________________________________________ > Phono-L mailing list > Phono-L@oldcrank.org > http://oldcrank.org/mailman/listinfo/phono-l > > _______________________________________________ > Phono-L mailing list > Phono-L@oldcrank.org > http://oldcrank.org/mailman/listinfo/phono-l >
