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NAD 3020 amp upgrades?
NAD 3020 amp upgrades?
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Old 27th December 2013, 12:19 AM   #71
academia50 is offline academia50  Argentina
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Join Date: Jan 2013
Originally Posted by academia50 View Post
Hello, I read all posts and I think very important not to overdo the recommendation in the value of the PS capacitors. See post 16, Piercarlo. I read an excellent review of it, and reveals a technical knowledge of a higher level than everyone else.
My 3020 first said a "minor" niggle, the speakers at power moved (once you put a delay circuit with relay for speakers) excessively, I think Xmax reached the limit. Accompanying this double "blop" as if the source is recharged 2 times.
Besides the power pack had a small vibration that was transmitted to the rest of the chassis.
I Replace the 4 caps of 2200 uF 35 V for another 3300 uF 35 V. (Always put new capacitors of the same voltage or slightly superior work, this tension is that somehow determines the ability to form the dielectric)
The original bridge diodes General Instruments KBL02 is 4 amps x 200 volts. Was replaced by 6 amperes 1000 volts.
He has returned everything to normal, now I want to adjust DC off-set, and idle current. There is a small millivolt (-) DC on the terminal (+) the block speakers....
But do not know if it's worth, I have - 28.5 mv in the left channel and - 70.5 mV in the right channel ..
Write to Piercarlo, meanwhile, have technical and expert opinion is welcome mujy.

Greetings and thanks friends....

Last edited by academia50; 27th December 2013 at 12:25 AM.
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Old 3rd October 2018, 05:10 PM   #72
AntonellaFran is offline AntonellaFran
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Join Date: Oct 2018
Default Refurb companies in usa to redo NAD 3020

Are there any Refurb companies in usa to redo NAD 3020?
I saw a link online somewhere but I forgot where I saw it! Thank you!
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Old 9th October 2018, 08:35 PM   #73
Czorales is offline Czorales
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Join Date: Sep 2018
Originally Posted by TDWesty View Post
I also have a lone cap, C427, which doesn't appear anywhere, and doesn't have a pair.

Whats the value of this capacitor ?
I was searching this information on many pages and service manuals.
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Old 2nd December 2019, 09:55 PM   #74
noyloj is offline noyloj  United Kingdom
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Join Date: Nov 2019
Did you find the value of C427 in the end?
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Old 3rd December 2019, 05:46 AM   #75
avtech23 is offline avtech23  Australia
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Join Date: Dec 2017
Location: South 'straya
NAD 3020 amp upgrades?
Have a look through this thread:

NAD 3020 recap
The ever growing project list.. :NAP140, NAD 3020i & 3225PE, JLH1969, TDA2050, Fender 5F2A Princeton, NE5532 HPA, SHPA, B1 Korg, T2, LM4780. : VSQC Phunk Style, Retro 50W, Filmosound 601, AX14. :Young NAP250, TGM10, TDA7265 (Last in line)..maybe
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