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Read between the lines of the service manual ! There are many versions . I suggest the last : rev. 6-81 For RCA connectors use a type like this : https://anasounds.com/produit/anasounds-sommercable-rca-female-connector-red/ Ciao Marco

To restore a PL 4000 simply follow the famous motto : divide and conquer ! Start with the minimun config : tone board and logic board . In this config it's only a line preamp . Some considerations : - 1st version of mother board and front panel are a disaster and there were replaced after S/N...

I have restored 2 Pl 4000 s and now they work well . It' possible , but it' a long and boring job. Your unit is the 3rd version ( ambience instead of SQ logic ) and many issues were fixed by PL . Read carefully service manual ( rev 6 -81 ) before starting . Ciao Marco

Too many solutions ! Better to wait for an other unit with knobs in a decent state . Anyway thank you for your answers . Ciao Marco

Thank you guys . All the products suggested are available here , but there are many equivalent . For example you can use vinegar instead of CLR. I will try if I buy this preamp . Ciao Marco

https://www.subito.it/audio-video/dynaco-pas-3x-frosinone-525996954.htm Any ideas how to clean the knobs of this Dynaco Pas 3X ? Baking soda , sodium idroxide , special polish , drill .... Not yet taken, because now I'm not sure to buy it , but ... Thank you Marco

That's right , but I would add the phase shift of low pass filter , the lack of noise and probably a sort of imprinting , because we learned to listen to the music with vinyl records ( before 1982 ). See also Bob Carver's Digital time lens . Anyway , fortunately amps and speakers are analog ...

Not only ! Analog sources sound a little better in the mid range ( IMHO of course ). Ciao Marco

And the winner is : Xi Jinping ! The West is in bad shape ! Ciao Marco

just out curisity , who is Amir ? Is the founder of Audio Science Review ( ASR ) forum ? " the man with Pink Panther " ? If yes, he seems like a divisive person to me. Ciao Marco

Welcome aboard ! Marco

Ciao e benvenuto ! Marco

Ciao from Italy ! Marco

Ciao from Italy ! Marco

You must use 0,01 uF 400 V for 120 VAC or 0.022 uF 630 V for 230 VAC .( typical values ) Anyway after replacing the power switch , it's better to use a 16 A relay in series or Don's circuit . I use a 16A relay on PL 4000 ( with capacitor ) to power PL 700B on . and an external power strip with...

Exactly like that . Ciao Marco

O.K. But there are other brands ! PL is a must , but I have also Marantz , Dynaco , Yamaha and Quad . They sound different but they sound great ! Ciao Marco

A mistake ,sorry : not with 400 . Ciao Marco

I mean the relay on PL 4000 for switched AC outlets . On service manual rev . 6 81 it's written : Note : the relay is not capable of switching power amplifiers rated at greater than 250W / channel. In other words : PL 400 yes and PL 700 no . Infact I had problems with 700 and not with 700...