NAD 3020A - Modern Replacement Transistors - HELP PLEASE

deltavektor · 3rd July 2010, 05:28 PM

Hi there

I would like a definitive list for placement transistors for a NAD 3020A amplifier. The transistors needed are the following:

2N3055 & 2N2955

2N6551 & 2N6554

Thank you in advance.

I accidentally destroyed my NADs right channel due to a wrong connection in a speaker crossover... very mad at myself.

blmn · 3rd July 2010, 06:01 PM

Hi,

2N3055/2955 still available. See at Farnell or other Internet vendor.

2N6551/6554. BD137/138 might work well. Available at Farnell too. Take care of pins disposition.

regards,

deltavektor · 3rd July 2010, 06:13 PM

Quote:

Originally Posted by blmn

Hi,

2N3055/2955 still available. See at Farnell or other Internet vendor.

2N6551/6554. BD137/138 might work well. Available at Farnell too. Take care of pins disposition.

regards,

Mmm... RS Components only stock the 3055s! I'll try Farnell but out here in Africa its dark concerning such obscure parts!

homemodder · 3rd July 2010, 06:27 PM

Quote:

Originally Posted by deltavektor

Mmm... RS Components only stock the 3055s! I'll try Farnell but out here in Africa its dark concerning such obscure parts!

It shouldnt be hard to locate these parts except for the 2n devices, Im ex SA, tell me where you located and Ill give you hints where to get these parts from.

Aldotin · 3rd July 2010, 06:27 PM

Not 2N2955, but MJ2955!

deltavektor · 3rd July 2010, 06:28 PM

Quote:

Originally Posted by homemodder

It shouldnt be hard to locate these parts except for the 2n devices, Im ex SA, tell me where you located and Ill give you hints where to get these parts from.

Near Nelspruit... Thanx in advance!

deltavektor · 3rd July 2010, 06:33 PM

Quote:

Originally Posted by Aldotin

Not 2N2955, but MJ2955!

So I gathered... the schematic must be wrong...

blmn · 3rd July 2010, 11:07 PM

Hello,

As a fellow said above, MJ2955 and 2N3055 can be used on a pair. Use both with the same fT.

regards,

Browse for Products | Farnell United Kingdom

Browse for Products | Farnell United Kingdom

deltavektor · 4th July 2010, 07:36 AM

Quote:

Originally Posted by blmn

Hello,

As a fellow said above, MJ2955 and 2N3055 can be used on a pair. Use both with the same fT.

regards,

Browse for Products | Farnell United Kingdom

Browse for Products | Farnell United Kingdom

I am unable to buy from Farnell. No credit card and no bank in my town can do an international deposit. I am screwed!

Ian Finch · 4th July 2010, 08:23 AM

NAD 3020 and later variants had a few driver complements.
Hitachi/Renesas 2SB649A, 2SD66A were also used.
The 3055/2955 power complements would have to be the longest runnning, most common and cheapest on the planet.

Deltavektor, you haven't said what is available to you. Is there a repair shop with any transistor parts nearby?

3rd July 2010, 05:28 PM	#1
deltavektor diyAudio Member Join Date: Sep 2008	NAD 3020A - Modern Replacement Transistors - HELP PLEASE Hi there I would like a definitive list for placement transistors for a NAD 3020A amplifier. The transistors needed are the following: 2N3055 & 2N2955 2N6551 & 2N6554 Thank you in advance. I accidentally destroyed my NADs right channel due to a wrong connection in a speaker crossover... very mad at myself.

4th July 2010, 08:23 AM	#10
Ian Finch diyAudio Member Join Date: Apr 2010 Location: Coffs Harbour, on the east coast	NAD 3020 and later variants had a few driver complements. Hitachi/Renesas 2SB649A, 2SD66A were also used. The 3055/2955 power complements would have to be the longest runnning, most common and cheapest on the planet. Deltavektor, you haven't said what is available to you. Is there a repair shop with any transistor parts nearby? __________________ regards

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3rd July 2010, 06:01 PM	#2
blmn diyAudio Member Join Date: Feb 2001 Location: .	Hi, 2N3055/2955 still available. See at Farnell or other Internet vendor. 2N6551/6554. BD137/138 might work well. Available at Farnell too. Take care of pins disposition. regards,

3rd July 2010, 06:27 PM	#5
Aldotin diyAudio Member Join Date: Dec 2009	Not 2N2955, but MJ2955!

3rd July 2010, 11:07 PM	#8
blmn diyAudio Member Join Date: Feb 2001 Location: .	Hello, As a fellow said above, MJ2955 and 2N3055 can be used on a pair. Use both with the same fT. regards, Browse for Products \| Farnell United Kingdom Browse for Products \| Farnell United Kingdom

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