chilimac wrote:Hi all, I just joined this forum and this is my first post. Several years ago I found a pair of mid-50s Rek-O-Kut Rondine tables on ebay, and set out to make one good one. One of them was cosmetically near-perfect but had a bad motor. The other was a cosmetic nightmare but the motor was OK. I had the idler wheel re-tired professionally and set about making a fancy plinth, then replaced the old stock pickup arm with a fairly modern Sony arm. The resulting setup looks great, but sonically it turns out to be a rumble generator. I understand this is fairly characteristic of the old Rondines when playing stereo records. I have three other more modern tables, so it's not that I depend on the Rondine except that it's the only one I have that has the 78 speed, and I'd like to get it quieted down.
Is there any community wisdom on what (if anything) can be done to reduce the rumble in one of these? I grew up with one in the mid-late 50s in Wisconsin and thought it was a superior piece of equipment, but maybe it was too old a design to be useful in the modern era. Built like a tank, though, and I'd really like to get it right.
Any suggestions will be most appreciated.
Thanks for the response. I figured the motor mounts would likely figure into it. And I like the idea of a belt drive conversion, in fact I was trying to figure out a way to engineer such a thing but it seems to be beyond my ingenuity.
A kicker is that in 1964 I bought (new) a R-O-K N34H belt drive 33/45 machine and used it for many years, but in about 1988 the belt had stretched so far it wouldn't turn the platter. This was in the days before the Internet, so I didn't have a clue where to find a replacement belt, so (grit your teeth) I pitched the whole machine into the dumpster. I'd give anything to have that one back now.
Unfortunately, both of the stock pickup arms on the two Rondines I got from ebay were in bad shape and went directly to the dumpster.
The sticker on the side of my motor says "General Industries Co, Elyria, Ohio, Model D10". Nothing about Papst. To me, it's an ugly squat square thing. But it seems to run freely without any noise. I haven't got into it yet to check the bearings.
chilimac wrote:Here's a pretty significant update. I spent much of the day today tinkering and testing the Rondine. One thing I discovered is that some previous owner decided there was no apparent reason for a run/start/phase shift capacitor, so it's completely devoid of such. It also does not have the power cutoff switch that appears to have been connected to the speed control switch. This is no big deal as far as I'm concerned, since I added a toggle switch for main power.
The much more important results are as follows:
1. After a few minor fix-ups, I set everything ostensibly in order and powered it up, connected to a vintage system (all I've got) of Dyna Pas-3 preamp, BK Systems ST-140 amp, Sherwood Tanglewood speakers. Started with a late 60s recording of the Orchestre de Paris on Angel, Le Marselleise. Sounded pretty good, but the level not as high as I would have expected, using a Bang & Olufsen MMC 10E cartridge.
There was still some audible rumble present, but I'd just started on the curative process, and I could almost live with what I was hearing. But then I decided to switch to a 78 cartridge and try one of my ancient 78 discs, only to discover that I was getting no sound at all through the system. Back to the LPs, I found that I was dropping the left channel quixotically. Time to disassemble and run some tests!
I swapped turntables and resorted to a Marantz TT2200 direct drive, after swapping in the 78 cartridge. Of course, it worked perfectly.
This led me to think about the wiring in the Sony arm. It's a b****r to trouble shoot as there are two points where you have contacts between rods and socket pins, where it's a PITA to get test probes in. Final discovery is that I apparently have at least one short in the internal wiring in the Sony arm, and that could be a headache, but it's reserved for tomorrow.
The good news is that the Rondine is in passable kip, and with some diligence and a few decabucks might just be rejuvenated.
Adolescent note: I really like operating the giant speed control knob. It's like turning the main gun on an Abrams tank.