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Broken Diode And Shorted Tantalum Capacitor Found In NAD C300 Amplifier

By on May 12, 2020
c300 amplifier repair

how to repair nad c300 amplifier

Those of you who have not read my previous article (September, 2017) on this amp, may please read :

My friend brought this set back to me (May, 2019) stating that the power on LED was not working. I opened and cleaned the set and looked for the trouble maker component/s in the set.

I had to remove the front panel to get access to the board. Found a diode broken and one tantalum capacitor short! Replaced the diode with IN4148 and capacitors by normal ceramic capacitors. Found the LED working fine:

how to fix nad c300 amplifier

how to fix and repair nad c300 amplifier

Assembled the set back after changing the awkward looking knob to a better one covered by black tape.

Tested it once again thoroughly. It worked fine for several hours, before customer came to pick it up.

how to fix and repair nad c300 amplifier

how to fix and repairing nad c300 amplifier

Thus, the second part of servicing C300 NAD Amp, concludes, after which the ‘satisfaction’, which has by now become automatic, jumped into the bag happily this time too, i.e., twice on the same set!

This article was prepared for you by Parasuraman Subramanian from India. He is 70 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.

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You may check on his previous repair article below



  1. Waleed Rishmawi

    May 12, 2020 at 7:28 pm

    a very well done repair job. how you are doing well.have a blessed day

    • Parasuraman S

      May 13, 2020 at 12:46 am

      Many thanks. I am superfine as always!

  2. Albert van Bemmelen

    May 12, 2020 at 7:51 pm

    The NAD C300 Amplifier was still working splendidly after your previous repair. Just the power-on led failed this time. And this new failure had nothing to do with the previous repair, which shows that your previous work was not in vain!

    • Parasuraman S

      May 13, 2020 at 12:46 am

      Many thanks for your encouragement!

    • Lesley

      May 31, 2020 at 3:58 am

      Good day my A3 pulse amp is powering on with all functiond but no sound... Can you please help ... Need advice please.

  3. Mark

    May 12, 2020 at 10:49 pm

    Well done Parasuraman,

    Another repair to your credit!

    • Parasuraman S

      May 13, 2020 at 12:47 am

      Many thanks!

  4. Humberto

    May 18, 2020 at 9:43 am

    Well done Parasuraman, in my personal opinion, you are a Master.

    • Parasuraman S

      June 12, 2020 at 3:07 pm

      Many thanks!


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