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This device could be a solution https://www.thequp.com/ Ciao Marco

I partially agree with you , Joe . For me Autocorrelator and Peak Unlimiter functions are a good " Dynamic range ricovery system " Good for vinyl records and to compress the dynamic for modern soundtracks in case you connect the TV to your hifi system . For CDs are moreless useless ...

After checking PSU , in case the fault persists , remove all the boards except tone amp and logic boards . This is the minimum config . Use ,if you have ,a cassette deck as AC voltmeter connected to main output . Don't use a power amp when you move and remove boards . Ciao Marco

Add a resistor . To find the right value use a 220 KOhm pot and measure . It's the typical issue . At that time center snap pots probably did not exist or they were expansive See my Dynaco PAT 4 . ( I had a 2dB tracking error ) Only one resistor to fix the problem. Ciao Marco

Only volume pots must be logarithmic . https://en.wikipedia.org/wiki/Equal-loudness_contour All attenuators generally are linear. In any case every linear pots can be easily modified to become log or anti log...

Why do you want to replace pot ? Generally it's sufficient to deox it. The pot mounted in PL 2000 has no center position and so at 12 o'clock one channel could be higher than the other one . If this is your issue you can compensate the tracking error with a resistor connected in parallel on...

Ciao from Italy Marco

But it's necessary for the age and not for noise . In this case l generally saw loss in path , hum , short and so on . These are faults . IMHO . Ciao Marco

According to my experience in hifi systems , I saw these problems for noise : - ground loops ( NAD 4150 grounded ) Cause :a mistake by Nad that sent to Italy some units for UK market Solution : I disconnected the ground - motorboating ( Dynaco FM 5 ) Cause : Power line ethernet...

Bypass caps are well known solution to reduce noise due to RF so two questions : 1) Can you hear the difference in sound ? 2) In PL400/ PL700 service manual it' written to add 4 caps across the rectifier in case of RF interference , so what's the best solution ? Probably for AM ( very...

In my two units mother boards are O.K. Probably the reason is that there are two versions . First version has power transformer located on the mother board instead on the rear panel . See service manual . Probably first versions were critic .Also front panel was replaced with a new version ...

Just found 4 pieces in a decent state . Please send me your address , so probably I'll send you RCA connectors tomorrow morning Ciao Marco Ps : I don't understand the question about the Led . Leds have the same voltage drop depending of colors Red is approx . 1.6 V

I confirm everything . Shorting capability is necessary only with phono inputs if not used . In this case use shorted RCA male plugs . See , for instance , Yamaha , Pioneer preamps. If you replace RCA connectors use a type with two plastic washers . The connection between ground and chassis...

You have to remove the bottom panel ( 6 lateral screws and two screws in the center ) Ciao Marco

You have the 3rd series , because the front board is soldered to the mother board . On the front panel it's written "ambience / 2 channel ". In this case caps are O.K. You have only to replace RCA connectors . Ciao Marco

1) the connector is for joystick 2) mother board and front panel board look O.K. They are the second version ( look at the thickness vs the other boards ) 3) check S/N of the unit : if below 3000 you must replace all caps ( 50 V instead 35 V ) 4) you must replace all RCA connectors...

You are in the right place : the Phase Linear kingdom . Ciao Marco

Just asked my hifi guru for this amp. He saw one unit ( a sample for importer and retailers ) It was designed after PL 400 and the idea was to use it in case of bi amping in order to have the same front panel design . Now I wait the check with Ed to have a confirmation . Ciao Marco

First of all , welcome . Check the number of your board ; it should be PL 0171 . It was mounted on PL 700 . It has 6 trims : input DC offset , output DC offset and bias . ( x 2 ) Schematics are available on PL 700B rev .1 Probably old models used this kind of board . Ciao Marco

Ciao and welcome ! Marco