Hi, I have bought a Philips CD 471, with the CDM4/11 drive.
I want to do the obvious mods. The drive is excellent, even runs scratched discs that my CDM1pro (??, meridian) won't handle!
I cannot disassemble the whole thing. There is still one screw left over on the front side beneath the drawer.
- I have taken off the front panel,
- the disc tray cannot be moved aside to reveal the screw
Who knows how to take the drawer apart?
I want to do the obvious mods. The drive is excellent, even runs scratched discs that my CDM1pro (??, meridian) won't handle!
I cannot disassemble the whole thing. There is still one screw left over on the front side beneath the drawer.
- I have taken off the front panel,
- the disc tray cannot be moved aside to reveal the screw
Who knows how to take the drawer apart?
poynton said:
Andy,
what tabs? There are two white guiders but I see no tabs around. The one left is held by a spring.
I can't post a picture 😕
I'm trying not this time going to break it to get it fixed
alberti
Modifications list CD471 with 1541A
Thanks, I overlooked that place
.
My mods schedule is:
1) mute from 7220 pin 23 to 7210 pin 11 (done)
2) take out the mute transistors (cut) (doone)
3) use oil caps in output 1.5 muF and keep 2x100 ohms because the opamp needs that (done)
4) replace the capacitors in the powersupply decoupling with real solid tantal.
subsequently, when done: and good progress -
5) current source to outputs of 1 mA (2SK30/100 ohms or so)
6) put on the 2x7 100 nF decoupling of the current switching
7) put in a good discrete output that bypasses all opamps stages and use passive R (39 ohms)
8) make a powersupply shunt for the 7220 (200 mA capacity on bursts)
And then, go into the real investment and largest improvement:
9) add a Tent clock, distribute to 7220 (and maybe . . to 7210)
10) contemplate to send half clock to 1541A!
Now, what about NOS? Yes tried it several times on the 1543, like it there (in Jazz) but hesistate... (for classical music).
Just to have a better architecture, I took out part of the bottom plate, makes handling the unit so much easier.
alberti
Thanks, I overlooked that place
.
My mods schedule is:
1) mute from 7220 pin 23 to 7210 pin 11 (done)
2) take out the mute transistors (cut) (doone)
3) use oil caps in output 1.5 muF and keep 2x100 ohms because the opamp needs that (done)
4) replace the capacitors in the powersupply decoupling with real solid tantal.
subsequently, when done: and good progress -
5) current source to outputs of 1 mA (2SK30/100 ohms or so)
6) put on the 2x7 100 nF decoupling of the current switching
7) put in a good discrete output that bypasses all opamps stages and use passive R (39 ohms)
8) make a powersupply shunt for the 7220 (200 mA capacity on bursts)
And then, go into the real investment and largest improvement:
9) add a Tent clock, distribute to 7220 (and maybe . . to 7210)
10) contemplate to send half clock to 1541A!
Now, what about NOS? Yes tried it several times on the 1543, like it there (in Jazz) but hesistate... (for classical music).
Just to have a better architecture, I took out part of the bottom plate, makes handling the unit so much easier.
alberti
- Status
- Not open for further replies.