The BKT uses a completely different, and much simpler gear change mechanism. The BFT and the Senior Columbias the gear change mechanism is on the left side and is nickle plated. AL ----- Original Message ----- From: "Loran T. Hughes" <[email protected]> To: "Antique Phonograph List" <[email protected]> Sent: Sunday, November 07, 2004 2:50 PM Subject: Re: [Phono-L] 2/4 setup on a Columbia BFT
> 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" <[email protected]> >> To: "Antique Phonograph List" <[email protected]> >> 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 >> [email protected] >> http://oldcrank.org/mailman/listinfo/phono-l >> >> _______________________________________________ >> Phono-L mailing list >> [email protected] >> http://oldcrank.org/mailman/listinfo/phono-l >> > > _______________________________________________ > Phono-L mailing list > [email protected] > http://oldcrank.org/mailman/listinfo/phono-l >
