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I restored 2 PL 4000 units , so I would add some other considerations : - mother board and front board are critical below S/N 2000 - caps values are critical (35 V in stead 63 V ) below S/N 5000 - RCA connectors are really a disaster ( they are too fragile after 45 / 50 years ) -Output relay...

Correct but it's too close to the limits . Ciao Marco P.S: I am very conservative

O.K. LME 49860 specs says : Easily drives 600 Ohm loads and Output short circuit protection . If you use this Op Amp I agree with you . I' m not sure that OPA 2134 is able to drive "easily a 600 Ohm load " and it has a good short protection . Ciao Marco

An OP amp is " the same " as a signal transistor for the power . https://sound-au.com/project24.htm This is only an example . Anyway prepare a cable RCA / jack and test , but for me the output power of an op amp is not sufficient also with a 600 Ohm load . Ciao Marco

If you use the PL 4000 front jack output with a 600 Ohm headphone ( tested with HD 414 ) the signal is too low , because there two 1,2 kOhm resistors in series . The reason is to protect the two output transistors ; this output was intended as "aux" . According the service manual rev. 6-81...

I was simply considering a stock PL 2000 preamp . Sorry for mismatch . Ciao Marco

Marantz 3200 preamp has no internal headphone amp ; it uses the power amp connected to output jack via 2/3 W resistors . Generally headphone amps use medium power transistors ( BD 139 / 140 ) , but I think you need to redesign the PSU . You could copy the C4000 schematic . Ciao Marco

I use a small external headphones power amp for my two PL 4000 preamps , connected to tape 2 out . In case you don't use phono input you can switch amp an preamp off. Furthermore you can spend what you want ...

Anyway You Tube is a good help to choice your favorite musical performance . First listen and after buy . Ciao Marco

Classical music and chamber music have an "other problem" : conductors and soloists . If you listen to a Beethoven's symphony conducted by Von Karajan or by Bernstein you immediatly "feel the difference" ( it's only an example ). At this point the list is more complex . Some examples ( IMHO ) ...

Buon Compleanno Marco

Opus , K or KV , BWV , HWV are classification system : Opus ( work ) is generic K or KV for Mozart ( Köchel Verzeichnis ) Kochel catalog BWV for Bach ( Bach-Werke-Verzeichnis ) Bach catalog of works HWV for Handel (Händel-Werke-Verzeichnis ) Handel catalog of works It's moreless a...

In attachment you'll find the service manual , unless you already have it. I hope the aligment procedure will help you . Ciao and welcome Marco

Buona Pasqua ! Marco

I have no idea for how long ! It's not a correct adjustment . A stroke of luck only . Ciao Marco

It works ! I simply rotate a little screw on laser assy ( laser power ? ) There are two screws and I moved first the right one . I was very very lucky ! Fifty fifty ! This was the last attempt . Now the unit is under observation , but tested with many DVDs and CDs . Happy Easter to all and ciao...

Ciao from Italy ! Marco

https://www.amazon.com/LM-YN-Wirewound-Electronic-Aluminium/dp/B076W5T9SL/ref=sr_1_5?crid=20RGZORW9Q0PD&dib=eyJ2IjoiMSJ9.zmacEBGBHhIpARag5NM4UjYvaOrM0SkEC9hSKCIlEKaOBrwWLIYLDek__kuhSw38339tP7EYv3AwY6RF4Wk3plQm1QYzhjITbWMxOWW-jtfFt0_MAn08tKbSSZEhz31RHByik_TN2bwxNIp3DDeOC_x2USEmygRCp075ccdIkJZ2VbDc...

I have no the guts to throw away it . To throw or not to throw , that is the question . Better : to click or not click on Amazon to buy a Chinese laser unit . :):):) Ciao Marco

It was very expansive , because 23 years ago was one of top models by Pioneer . The sound is great due to a 96 khz 24 bit DAC . Thank you for your answer. Ciao Marco