Teac VRDS-T1 Transport

[Qwin]

How can you have jitter in an analogue chain?
Its a different kind of distortion, but I suppose it can sound similar by the time it gets to the speakers/your ear.

[Macca]

How can you have jitter in an analogue chain?
Its a different kind of distortion, but I suppose it can sound similar by the time it gets to the speakers/your ear.

Jitters caused by inconsistency in the arrival time of information which is an issue with both vinyl and tape due to their lack of speed stability. Whether it's analogue or digital the signal is still just voltage varying with time.

[Qwin]

Jitters caused by inconsistency in the arrival time of information which is an issue with both vinyl and tape due to their lack of speed stability. Whether it's analogue or digital the signal is still just voltage varying with time.

Everything is effected by time delay, even when I drink a pint, don't think I would call my experience jitter, possibly DT's.

[Barry]

Analogue "jitter" is called 'wow and flutter'.

[Gazjam]

100% agree about electrical noise from power supply.
Even bleeding from elsewhere (ugh...) noise can cause big problems.

Found the biggest gains in my system tackling that specifically.

vinyl and tape have magnitudes more jitter than even the worst CD player and those things are not an issue with those formats.

I'd suggest the worst problem you can have from CD is power supply noise bleeding into the signal, which you do see with some players (even expensive ones) which can be bad enough to cause the sort of effects you describe.

Really high levels of jitter just sound like tape wow, never an issue with CD.

[Jimbo]

Anyone know if the CDM4/21 Phillips transport is any good. It looks like a solid bit of engineering to me unlike the flimsy drawer mechanisms found on so many CDP.

[CageyH]

According to a thread on DIY Audio, the 4/21 seems to be quite a rare model.

[Jimbo]

According to a thread on DIY Audio, the 4/21 seems to be quite a rare model.

Yes there were any iterations of the CDM4 mechanism so this was just one implementation. It might be that it was a bespoke model for a particular manufacturer.

In general I believe the CDM4 was a robust transport?

[Barry]

The best site listing, and describing, all the Philips CD laser mechanisms is Hi Fi Advice. It is the most comprehensive site I know of.

But even there, there is no mention of a CD4-21, so it must be pretty rara avis!

[Qwin]

Yeh, many variants, some with plastic frame like the CDM4/21 and numbers, both lower and higher, with plastic or Die cast alloy.
The real gems are the CDM4/53 and CDM4/Industrial both built like tanks and used in comercial kit like CD jukbox's.
The Industrial was used in the famous Mark Levinson No31 Transport.
The CDM4/36Pro also great, there are many very good versions and even the most basic was a good mechanism with a glass laser.
To be honest the drawer is irrelevant, as once inside, the CD is lifted off the drawer and there is no physical contact once qued.
The drawer is more about confidence, pride of ownership and pleasure in use, as long as it doesn't rattle and cause vibration problems during play its ok.

This is my go-to site for CD transport mechanisms:
https://www.hifi-advice.com/blog/cla...-1-mkii-cdm-9/

Edit: you beat me to it Barry, with the site reference.