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Two suggestions : - Replace RCA connectors : they are time bombs - Paint the solder points on the control boards using a pcb insulation paint : some shorts can occur when you insert the control board on the mother board Ciao Marco

I do agree with Jim ; tubes are not good for a phono amp . Anyway my question was related to the brands ( EL 34 for instance ) Ciao Marco

Now a million dollar question : What brand of tubes do you prefer ? I use JJ as recommended by VTA guys . ( together Tungsol ) Can you hear the difference ? Ciao Marco

http://www.tubes4hifi.com/tubes.htm Take a look here. Ciao Marco

https://www.ebay.com/itm/155001740353?_skw=el+34+reissued&itmmeta=01J85DZMBDFPXEE9Q0TACQNRS6&hash=item2416d2dc41:g:OlwAAOSwgitdtbxA&itmprp=enc%3AAQAJAAAA8HoV3kP08IDx%2BKZ9MfhVJKnL%2B47VZ1gCZHevId1Zfi02vBZm%2BkbFsJkwWuBt2EKr1SvzqImuL%2FOfZLzzYV9E%2Bz%2B6s6fAQARGGQYKimGhEyCXrXU9pwotQvrWGpeVMO7uVS5M...

Ciao from Italy . Marco

Have a fun , Lee . Ciao Marco

-Remove all boards -Insert tone board and logic board after cleaning their connectors . -Correlator , peak unlimiter , ambience , equalizer , tone , tape monitor in out position . -Use aux input and check again . In this config it's only a 15 dB line amp . Ciao Marco

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