After 40+ years my 1,978 Pioneer component amplifier blew up a power supply thyristor along with 2 resistors a couple of weeks ago.
My amp was still using its original pieces so I decided to replace the blown parts, and since I was working on it, I decided to recap the whole circuit with Nichicon Audio grade caps for electrolitics, also I replaced high wattage resistors (1/2, 1 and 2 watts) with Vishay/Dale metal film resistors and also ceramic caps, some of Polypropylene dielectric (the ones I could find) and the rest with c0g/np0 dielectric.
Is there something else you guys recommend doing or replace on my amp? Any suggestions are well appreciated. Thanks for taking the time to read.
Have a great day.
SkyWay
My amp was still using its original pieces so I decided to replace the blown parts, and since I was working on it, I decided to recap the whole circuit with Nichicon Audio grade caps for electrolitics, also I replaced high wattage resistors (1/2, 1 and 2 watts) with Vishay/Dale metal film resistors and also ceramic caps, some of Polypropylene dielectric (the ones I could find) and the rest with c0g/np0 dielectric.
Is there something else you guys recommend doing or replace on my amp? Any suggestions are well appreciated. Thanks for taking the time to read.
Have a great day.
SkyWay
Led VU lamp mod if Your lamps are burned. You can get lamps from JKL. I did connect a thick wire from the middle of the PSU capacitors to a chassis screw, since it is made at the phono ground lug and there was a slight hum / buzz. Phono Hum is quiet now when cranked loud. The flex inputs cable was also replaced with shielded wires. The whole stiff wiring was also upgraded and molex connectors added to the boards
Thanks for your suggestions Maaco, about replacing the flex input cables, witch shielded ones do you recommend?.
Is there something else I can do to improve my Amp?
Thanks again.
SkyWay
Is there something else I can do to improve my Amp?
Thanks again.
SkyWay
Ordinary non expensive...wait ... I didn't use shielded, but upon inserting the 15 wires on the connectors I twisted them. The same I did for the 5 from the Phono section.
The Tape DIN was connected with short wires directly to the Tape INS / OUTS and not to the front of the board.
The Tape DIN was connected with short wires directly to the Tape INS / OUTS and not to the front of the board.
OK, got it,
Doesn´t it causes any induction to twist the cables?
If not, I guess I can use CAT6 ethernet cable witch comes twisted and shielded.
Or not?
Doesn´t it causes any induction to twist the cables?
If not, I guess I can use CAT6 ethernet cable witch comes twisted and shielded.
Or not?
Hello guys I have another question.Originally this Amp comes with a 2x18 awg power cable, meaning that it only carries 120 volts and neutral.
I want to upgrade it with a 3x12 awg in order to carry 120 volts + neutral + ground.
My question is: since the power transformer, circuit and components where not originally designed to be grounded, will I have any problems if I ground the amp's chassis?
Or at the time the amp was made (1,978) was not common to have grounded outlets at home at that it why it was not taken in care?
Any suggestions are welcome. Thanks in advance.
SkyWay
I want to upgrade it with a 3x12 awg in order to carry 120 volts + neutral + ground.
My question is: since the power transformer, circuit and components where not originally designed to be grounded, will I have any problems if I ground the amp's chassis?
Or at the time the amp was made (1,978) was not common to have grounded outlets at home at that it why it was not taken in care?
Any suggestions are welcome. Thanks in advance.
SkyWay
Discussion of this new question has been moved to this thread - Grounded power cord for vintage amp@Skyway, is your browser giving your posts multiple spaces between lines.. there is a fix available for this. Otherwise I have to run around cleaning it up to improve readability for the others.