Modifications on a almost perfect cd-player? Your mad i hear you think
Notting is perfect ... only making it almost perfect is possible
Modification Teac vrds 10 special edition.
Why disable the DAC?
When Teac lanced this Cd-player the DAC already was outdated, course of the used Opamps.
The dac was not so new too.
I use the cd-player pure as drive
Another reason to avoid the internal DAC:
Phillips Bitstream Chip’s (like TDA1547) are famous for having been crippled sonically by some Idiot who integrated a analogue stage based on the NE5532 Op-Amp onto the silicon.
I never heard a worse opamp like the NE5532 Op-Amp , cheap trash cost notting more then 15 cents for manufacturing.
I love how they manufactured the cd-drive called "VRDS" 1995 dated
Vibration Free Rigid Clamping System
For 2 digital output
listed here, RCA have a 32 ohms impedance, digital outputs wants to see 75 ohms impedances
When you use RCA the connection makes lots of reflextions so digital transport will be a mess.
However 75 ohm will not reflex signals so RCA is not very good solution for transporting digital signals
From a audio-forum:
My transport currently uses an RCA output. Is there audible benefit in replacing this with a BNC connector and doing the same on the DAC?
I have bought Belden 1505A (could not get 1506A) (RG59, 75 ohm) to make some DIY digital cable. Is it critical that the BNC's are 75 ohm or can they be 50 ohm. Again refering to sonics of course.
Yes, it should help, and yes, the impedance is critical. A big question is did the manufacturer of your equipment make any effort to maintain 75R impedance inside the chassis.
Yes this teac does have a 75 Ohm impedance
Changed the RCA output to the BNC this is realy a not expensive modification and worth every penny.
Yes like changing the clock ....Listed 3:
The internal clock from 16.9344 MHz 100 pico seconds to the low jitter <3pico seconds tentlabs clock
Why? read about it
XO2.2 and XO3.2 are designed to be applied as an upgrade in CD and DVD players. They generate a very low jitter clock, which in turn clocks the DAC chips. This in turn leads to lower distortion in the audio spectrum. It pays off and results in:
• Lower grain
• More resolution
• Better transparency
• Cleaner sound
• Better bass
Most commercially available CD players contain standard clock generator circuits, producing typical jitter values up to, and over 100 ps. XO 2.2 / 3.2 output jitter is below 3ps, integrated over the whole bandwidth starting from 10Hz. Now guess how that distortion is reduced….
Some Photo`s on the modifications
This is the digital pcb board of the TEAC
at U403 you see the Crystal 16.9344 MHz still in use
Awaiting for the new Tentclock to exchange the old 16.9344 MHz crystal
mail me for modifying your Teac vrds 10 (se) or 25
BUILDING IN THE TENTLABS Clock
Main Clock little board
Drilling holes for mounting the Tentlabs Clock
Clock and psu boards are mounted.
Now making connections to the Teac board
Tentlabs build in underneath the digital board (right one)
Teac is not build and it`s playing beatifully
• Lower grain voices are much more clear
• Much More resolution
• Better transparency more rest in silences
• Cleaner sound, allmost no distortion
• Much Better bas, with no deforming
Ask me if you like this money worth build off in your teac player
Ed had listen to my modified set Teac vrds10se on his own home-set.
We did make a small demo and after a wile he was convinst about the TDA1543 DAC
His Teac is allmost ready now with Analog part screwed out of the Teac and build in 75 Ohm cable to BNC connector output.
Standard VRDS 10 but modified digital part by Eringa Holland somehow little rushed soldered the tweaks
This is a bad way to modify a diode bridge very dangerous not even isolated, shame on you Eringa Holland
But they know what they are doing all well changed caps at the chips who calculate the cd laser and dac
I could not let is like it is and i have isolated the leads with teflon
Back to business ......
Removed the analogue PCB board (left side Teac)
Isolated the metal power wires.
New 75 ohm coax to the leftside using the old RCA hole for the BNC connector.
(Waiting for more parts like the BNC connector .....
This way the teac is allays re-modified to original if costumer want it in the first place
Have forgotten to take a final photo but Ed has got the DAC and his modified Teac vrds 10 back.
He`s very pleased and was stund by listening for the first time to a new DAC and his tank teac.
Ed`s lauguage is dutch same as me hes a nice man about 59 years old and his english is not so good,
So i will translate his letter to me send by email.
eac vrds10se digital rebuilding (my own machine)
Replacing capacitors, rectifiers at digital part of the teac
Board has to come out first
just re-soldered new capasitors from 47uF/10V original to 47uF/35V from Elna silmic ars types
Why? higher voltages Caps have lower D.A.Factor distortion and the Dac is now 16 years old
So caps don`t have the live time forever.
Old Black nameless 47uF/10v out the board have put in the 47uF/35V from Elna silmic ars
Changed 18 ps 47uF/10V to 47uF/35V from Elna silmic ars, removed bridge rectifier S2VB to Scotkey Diodes fastest i could get here local 100V/3Amps
Rightside digital board with new caps ready for its new fresh start.
Have played the teac for 24 hours now, man this is realy a cool tweak.
Everything is more precise and audioable noticed worth every penny