TT drive belt comparison


Hi folks,

Last night and today we A/B'd the two drive belts that came with our new Teres 265. One is the standard silk string as explained on the Teres web site. The other is a 1/2" wide length of spliced magnetic tape. Chris Brady is now supplying a 1/2" high motor pulley, at least on some models, and is testing a variety of belt materials.

SUMMARY: the magnetic tape beats the silk string very handily

Why? Because the tape provides better speed stability. The audible differences are at the micro-detail and instrumental/voice timbre levels, but they are clear and entirely in favor of the tape. The tape significantly reduces the time-smearing of notes, making the whole system sound faster and cleaner.

Soprano soloists and choruses are notably clearer, cleaner, better differentiated, less shrill, less sibilant. Very high-pitched organ notes are far less smeared or distorted, as is every note and overtone on that notoriously difficult beast, the harpsichord. The voice of a bowed cello or bass is weightier and more authentic because each vibration of the string is now clear. Individual voices in the orchestra are more individual, less mushed together. Nearly all attacks are quicker and weightier.

I could go on but you get the idea. If your Teres (or other TT) will accomodate a tape rather than a string or rubber belt, I recommend you try it. It's fussier to set up. The motor and platter must be levelled exactly the same or the tape will crawl off the pulley. I shimmed the cups beneath our motor spikes with varous thicknesses of paper and now the tape stays in the center of the pulley.

Good job Chris!
dougdeacon

Showing 7 responses by dougdeacon

Here's another source for a 1/2" videotape splicer:

http://www.mvipro.com/splicingblock.html

$32.95US for a splicing block and some splicing tabs.
Sean, nice statement of the dilemma. It's one of those core conflicts that prevent "perfect" LP playback. Another such is the two contradictory demands on the tonearm. It is expected to hold the cartridge motionless above the groove, resisting all vibration induced by the stylus and cantilever, while at the same time following their lead to track a spiralling target. The better the arm is at one task the worse it must be at the other, at least conceptually.

Due to a number of design elements, the Teres 265 is highly resistant to vibration, including motor vibration. Therefore, as you say, closer coupling to the motor should stabilize speed by reducing stylus-induced variations. That was our experience. On other tables, YMMV of course.

Cmk, since Redpoint began by following in the footsteps of Teres, maybe they're both walking in circles! Of course going in circles is the goal, so I guess that's okay. :)

WARNING TO ALL
Cut power to your Teres motor before attempting to feed the tape. Once the tape is on the pulley, even part way, any movement of the platter will start the motor and there goes your tape. Voice of experience :(

RANDOM THOUGHTS
If 1/2" tape is good, would 3/4" or 1" tape be even better?
Does wider tape put more pressure on the motor bearings?
Sean, sounds like I should get some 70mm film stock and a really tall pulley!

My tape was spliced just like the leader on a VHS tape would be.
Dmailer,

Thanks for the excellent followup. My mag tape is also .001", so I guess I'll have to order some of that mylar. I'll try to remember to post our impressions.

Unfortunately, one of our cats goes beserk for holographic silver gift ribbons. I'll have to avoid that color for the sake of my cartridge.
You're just jealous because you don't get to fiddle with belts and strings! :)

Wouldn't spinning a 30+ pound platter via DD require a larger, much higher torque motor? How would Teres maintain "almost non-existent levels of cogging and vibration" without driving costs up to the Walker level?
Eldartford... it's okay, I've always been a slow starter. There's not much DJ work for us classical lovers and a Teres isn't exactly portable anyway. I guess it might be if it were direct drive, one less box to lug around...

You certainly raise an interesting question. Almost makes me want to mod my TT for DD and report results. Now where did I put that chainsaw?