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Speed accuracy of a good direct drive spoils you..

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Speed accuracy of a good direct drive spoils you..

Postby cafe latte » 05 Oct 2017 08:36

Reason for my statement, just put Radiohead on, hmm that does not sound quite right someting is wrong???
Hmm I have changed the cart recently maybe I am hearing a different cart?.. No not that someting is wrong it sounds ever so slightly slow. Radiohead is not the easiest of albums to notice speed being wrong, but listening to spot on speed every day with my Technics something today was amiss for me. I have the Kab psu which has strobe disable fitted. The idea is disabled it smooths out the power so that is how I normally have things, but holding down the power button for a few second switches on the strobe again. All seemed normal at first glance, but hang on no actually I notice the dots very slowly crawling and I mean hardly moving at all but over 10 seconds you see it has moved. What could be wrong they have never moved before?? Then I notice the led on the centre mark for the slider is not lit up odd!! I touch the slider and it moves about 1.5mm back to centre, maybe less than that and the led lights up and the dots stop moving. Did I really hear such a tiny amount off with speed?? Clearly I did as I knew something was amiss. Must be direct drives get you used to speed perfection, when it is wrong it become screamingly obvious.
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Re: Speed accuracy of a good direct drive spoils you..

Postby analogaudio » 05 Oct 2017 18:21

Ahhh the miracles of the quartz crystal oscillator :-)
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Re: Speed accuracy of a good direct drive spoils you..

Postby cafe latte » 05 Oct 2017 23:45

analogaudio wrote:Ahhh the miracles of the quartz crystal oscillator :-)

:) They do ruin you though for anything less.
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Re: Speed accuracy of a good direct drive spoils you..

Postby ammarmariti » 06 Oct 2017 02:38

I'll be driven insane if Wish You Were Here and Dark Side of the Moon is played on a deck with speed drifts.
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Re: Speed accuracy of a good direct drive spoils you..

Postby cafe latte » 06 Oct 2017 02:49

ammarmariti wrote:I'll be driven insane if Wish You Were Here and Dark Side of the Moon is played on a deck with speed drifts.

It is amazing what you can hear and how annoying it is. I must have knocked the slider installing a different cart.
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Re: Speed accuracy of a good direct drive spoils you..

Postby JDJX » 06 Oct 2017 03:29

Was it running a bit too slow?
The reason why I ask is, it's usually more noticeable if running a bit too slow as the music seems to "drag".

However, if its a hair too fast, the music just seem a bit livelier somehow :)
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Re: Speed accuracy of a good direct drive spoils you..

Postby cafe latte » 06 Oct 2017 04:56

JDJX wrote:Was it running a bit too slow?
The reason why I ask is, it's usually more noticeable if running a bit too slow as the music seems to "drag".

However, if its a hair too fast, the music just seem a bit livelier somehow :)

Yes it was going a tiny bit slow, but really a tiny amount.
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Re: Speed accuracy of a good direct drive spoils you..

Postby davidsrsb » 06 Oct 2017 07:43

JDJX wrote:However, if its a hair too fast, the music just seem a bit livelier somehow :)

Which is why so many belt drives are built to run slightly fast
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Re: Speed accuracy of a good direct drive spoils you..

Postby RockerFrank » 06 Oct 2017 13:15

davidsrsb wrote:
JDJX wrote:However, if its a hair too fast, the music just seem a bit livelier somehow :)

Which is why so many belt drives are built to run slightly fast

On purpose, really? That's not right. I think it depends totally on the song. Joan Jett's version of Bits and Pieces is one that I like to use for testing, it bothers me if the speed is even a bit too fast.
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Re: Speed accuracy of a good direct drive spoils you..

Postby davidsrsb » 06 Oct 2017 16:10

Rega are notorious for measuring a little fast, most people won't notice
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Re: Speed accuracy of a good direct drive spoils you..

Postby Vanni » 06 Oct 2017 17:17

As does the infamous PL-12D. I once met an ex-Pioneer techie who told me that he had never seen a PL12 that ran true, all were faster even fresh out of the box.

I've also yet to discover a belt that makes this deck run at precisely the correct speed. I tried at least 4 ones, including one from TTN as people said it was the correct size, but all were quite audibly faster. Now I'm using the Thakker one and it is very very close to the correct speed and it's good enough for those beat up records. But there's no way I'd prefer the PL12 over a good direct drive.

Regarding Chris's observation, speed deviations are clearly more audible when the speed is slower rather than faster.
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Re: Speed accuracy of a good direct drive spoils you..

Postby davidsrsb » 07 Oct 2017 11:37

Belt drives without some form of feedback are not going to be spot on. Therefore the aim is to get that sweet spot of nominally just a little fast, avoiding going slow or into the chipmunks zone
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Re: Speed accuracy of a good direct drive spoils you..

Postby raphaelmabo » 07 Oct 2017 12:00

Belt drives has come a long way since... Modern belt drives with speed control works well... Not the cheapest on the market. But when belt is old, then even a good speed control can't help.
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Re: Speed accuracy of a good direct drive spoils you..

Postby Steerpike_jhb » 07 Oct 2017 12:54

The tape machines from which a lot of LPs were cut are not all that accurate!
A commercially pressed LP is not guaranteed to be absolutely at the right speed when played at 33⅓ RPM.
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Re: Speed accuracy of a good direct drive spoils you..

Postby rewfew » 07 Oct 2017 13:59

davidsrsb wrote:Rega are notorious for measuring a little fast, most people won't notice

Fast, slow you'd never know. And noticeable it was. Also prone to feedback. Placing my then new Technics 1200 where the Rega had been solved these problems. DD was the last great push of the state of the art. I'm eternally grateful for it.
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