Teac vrds 10 service help needed

[dht 4 me]

when the dac is plugged into usb the internal clock sync LED is lit.
When the SPDIF is plugged in the external clock sync LED is lit.
This is primarily a USB dac and I don't recall seeing the Crystal semi input reciever.

So what are you telling me.
it syncs to a reconstructed clock internally?

[Guido Tent]

Originally posted by dht 4 me
when the dac is plugged into usb the internal clock sync LED is lit.
When the SPDIF is plugged in the external clock sync LED is lit.
This is primarily a USB dac and I don't recall seeing the Crystal semi input reciever.

So what are you telling me.
it syncs to a reconstructed clock internally?

how else would you regenerate a clock from an SPDIF signal ?

best

[dht 4 me]

then it is fairly obvious to me that it is still reliant on the clock inside the VRDS as I has said originally .

The clock in the VRDS is ok and the Invisus reg helps but I am sure that the dedicated clock will be miles ahead.

[Guido Tent]

Originally posted by dht 4 me
then it is fairly obvious to me that it is still reliant on the clock inside the VRDS as I has said originally .

Yes, it does rely on the drive clock (but the recovered clock will never be as good, one needs a secondary PLL to achieve that)

best

[bobbyw]

Guido,

Have you a solution to replace the regulators on the VRDS-T1 ?
NJM78M05FA and NJM79M05FA used are done for 5V/500ma.
Your shunt regulator in 5V version is only 80ma, is it enought ?

Thanks
Henri

[Guido Tent]

Originally posted by bobbyw
Guido,

Have you a solution to replace the regulators on the VRDS-T1 ?
NJM78M05FA and NJM79M05FA used are done for 5V/500ma.
Your shunt regulator in 5V version is only 80ma, is it enought ?

Thanks
Henri

Hi Henri

Ina drive, the use of these regs is very likely for the servo's. It doesn't make sense to replace these, I'd suggest to spend money on the clock

best

[bobbyw]

Hi Guido,

Ok thanks.
I think it was a good tweak after changing the clock and the SP/DIF output module because dht 4 me said

I have a VRDS 20 that I converted to transport only. I added 3 Audiocom Invisus regulators and that made a big improvement.

I will contact you for Tube filament supply for my PP845 monoblocs.

Henri

[dutchaudio]

Originally Posted by dexsam

Hi all,

I recently acquired a TEAC VRDS10 as a cd transport. Though it is working, I found that on the Audio PCB, power supply area resistor R101 is broken with burnt marks on PCB. Could anyone advise the value or if possible provide me a copy of schematic?

Secondly, which tweak do you find, give the most improvement to the TEAC? A very frank clock maker advises against just changing the stock cystal osc with a 'low jitter clock' saying it is a waste of time and money if the unit is going to be used as a transport as the problem is with jitter at DAC end. Those 'clocks' were meant for cdp and not transports. For transports, the 'sychronizing' of the clocking at DAC end is far more complicated.

Anyone done tweaking on the digital output end like new BNC/RCA connector, coupling capacitor with good results? What about power supply tweaks?

Thanks in advance. Best Regards.

Maybe old tread but help on the resistor question.
THe resistor in the vrds10 has been a fault from TEAC, in the vrds10SE
The parts are very much the same but they change the resistor into higher ohms (course there was too much current running)
In vrds10 the resistor 101 is 220 ohms but you need to change it to 1K
So there is 5 times less current running and resistor gets with 220 much to hot.
I noticed it had the same with the 10 and i have a 10se too ....

I have the service manuals on ebay one guy is actually selling it on pdf
Hmm must be getting rich of it. Rip off if i may say it

So here is the solution to your teac resistor question

Visit my page about the teac tweaks
Teac vrds 10 SE - Dutchamps

Tweaks like :
Changing rca to bnc (gives hudge improvements with depth and widths in stereo is far greater )
Changing capasitors in the digital part (gives more precise imaging and stereo focusing)
Building in the tentlabs clock ( still busy with it to get it right, need Guido`s input )

There are email addresses available via my website

[Guido Tent]

Originally Posted by dexsam

Hi all,

Secondly, which tweak do you find, give the most improvement to the TEAC? A very frank clock maker advises against just changing the stock cystal osc with a 'low jitter clock' saying it is a waste of time and money if the unit is going to be used as a transport as the problem is with jitter at DAC end. Those 'clocks' were meant for cdp and not transports. For transports, the 'sychronizing' of the clocking at DAC end is far more complicated.

Thanks in advance. Best Regards.

This clock master should do some jitter measurements and study the average PLL applied in external DACs. Simple measurements show that he is wrong:

Measurements

Modern samle rate converters are much better in suppressing incoming jitter, but need care to perform right.

best