A good idea is to replace all the electrolytic capacitors with new ones. They also have a low ESR. You can also get the factory service manual to the NAD 208 THX as an addition. I will send it in PDF format.
eBay
Nobsound Mini Subwoofer/Full-Frequency Mono Channel TPA3116 Digital Power Amplifier HiFi Integrated Class D Amp 100W
Aliexpress UK
A good idea is to replace all the electrolytic capacitors with new ones. They also have a low ESR. You can also get the factory service manual to the NAD S200 as an addition. I will send it in PDF format.
eBay
ShennDare 4x2800W Audio Professional Power Amplifier 4 Channels 1U Subwoofer Amplifier Class D Line Array Speaker Preamplifier
Aliexpress UK
A good idea is to replace all the electrolytic capacitors with new ones. They also have a low ESR. You can also get the factory service manual to the NAD 2600 as an addition. I will send it in PDF format.
eBay
LASE Replacement Amplifier K Series Module for QSC K12, K10, K8, KLA12, KW152, KW153 Powered Speaker Bi-Amped Power-Amplifier
Aliexpress UK
A good idea is to replace all the electrolytic capacitors with new ones. They also have a low ESR. You can also get the factory service manual to the NAD T 973 MkII as an addition. I will send it in PDF format.
eBay
HiFi Digital Amplifier Max Power 1100Wx2 Channel 2.0 Home Stereo Sound Amp 2000Wx4 for KTV Stage Performance Sound System Kit
Aliexpress UK
A good idea is to replace all the electrolytic capacitors with new ones. They also have a low ESR. You can also get the factory service manual to the NAD T977 as an addition. I will send it in PDF format.
eBay
One Pair LJM A30W ONSEMI NJW0302G NJW0281G Dual Channel 30W 8Ω Pure Class A Power AMP Amplifier Finished Board with AP Test
Aliexpress UK
A good idea is to replace all the electrolytic capacitors with new ones. They also have a low ESR. You can also get the factory service manual to the NAD 3020 as an addition. I will send it in PDF format.
eBay
KYYSLB 650/900W Bluetooth 5.1 Channel 220V High Power Amplifiers Professional HIFI Karaoke Fever Digital Home Audio Amplifier
Aliexpress UK
A good idea is to replace all the electrolytic capacitors with new ones. They also have a low ESR. You can also get the factory service manual to the NAD 319 as an addition. I will send it in PDF format.
eBay
AK35 380 800W Home Digital Amplifiers Audio 110-240V Bass Audio Power bluetooth Amplifier Hifi FM Auto Music Subwoofer Speakers
Aliexpress UK
A good idea is to replace all the electrolytic capacitors with new ones. They also have a low ESR. You can also get the factory service manual to the NAD S250 as an addition. I will send it in PDF format.
eBay
50Wx2 Audio Sound Amplifier Class D CS8673E HiFi Mini Power Amplifier Bluetooth-compatible 5.0 Plug and Play AUX TF Home Theater
Aliexpress UK