Replacement output relays for NAD 214/216 AMP - diyAudio
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Old 3rd February 2012, 08:24 PM   #1
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Default Replacement output relays for NAD 214/216 AMP

Hi everyone

I have concluded that my NAD 216 Amplifier needs new speaker output relays.
I'm however unable to locate replacement relays with the same part number.
The schematics says the original part number is: DEC DH48D2-0 (M) DH 2U

Does anyone know the partnumber of a replacement relay that will work and fit on the printed circuit board?
Also, if you know a webshop where i can purchase them, then please advise.

Thanks for your help

Tue Madsen
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Old 3rd February 2012, 08:43 PM   #2
Bill_P is offline Bill_P  United States
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You can find a data sheet for the relay at ?????????????DEC. The relay coil operates on 48 VDC at 12 mA. The contacts are rated at 5 Amps. There is a dimensioned footprint in the data sheet. Match these specifications from another manufacturer's product line to get a replacement.
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Old 3rd February 2012, 08:54 PM   #3
cviller is offline cviller  Canada
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Hi Tue, not long ago, I bought a relay on ebay for ~3$ for the same nad circuit with the same specs - it worked out great. Can't remember the link, but I think you can easily find it. Normally the footprints are the same on that size relays.
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Old 3rd February 2012, 09:58 PM   #4
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While i have used a soldering iron quite often and are not afraid of exchanging the relays myself, my knowledge of electronics and component specifications are less than slim to none. :-(
So i'm afraid it would take me forever to find out that information. I know its a lot to ask since i'm a newbee, but if some of you has done this before and easily could find this information again it would really make me happy.

If i could just have a specific partnumber that can be bought in this day and age ;-) , i'm sure i could find out where to do it.

Thanks a lot for your info and help. You guys really rock.
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Old 3rd February 2012, 10:51 PM   #5
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Btw. I would love for it to be a better and higher quality relay if it is possible to improve on the old ones.

Thanks again for your efforts
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Old 3rd February 2012, 11:11 PM   #6
Bill_P is offline Bill_P  United States
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Ebay auction number 220780868780 looks to be a good substitute.
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Old 3rd February 2012, 11:19 PM   #7
Bigun is offline Bigun  Canada
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I've been looking at relays recently. I never realized before how poor they are at breaking a dc fault condition unless you are really careful about their ratings. If you dive into the datasheets you start to get a better idea of the issue. In all the cases I've seen, the ability of a relay to break open it's contacts and stop current flow when faced with an amplifier failure is suspect. The current rating of the contacts with a dc voltage across them appears to fall off rapidly as the voltage increases - and in most cases the data is for resistive loads. Some data sheets show inductive loads (speakers are inductive for the most part) and then the contract rating is even worse. I assume one needs to ensure that the rating for the relay in terms of dc voltage is ideally higher than the supply rail voltage.

Relays with marginal ratings will work fine - in that they will stop startup noises and powerdown noises - they just won't necessarily protect your speakers if the amp output fails hard to one of the supply rails.

The best relays I've seen are from the Netherlands but shipping costs are stupid silly. They have dual contacts, big one's to deal with nasty amp failures (with v high dc ratings), small ones in parallel to give good sound quality. The company is 'Amplimo' and I believe their special audio speaker relays are the best option.
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Last edited by Bigun; 3rd February 2012 at 11:27 PM.
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Old 3rd February 2012, 11:36 PM   #8
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@ Bill_p

Thank you very much for the link to the auction. That allmost seems to easy and perhaps cheap? Are you sure that will fit into the PCB, and that its quality wont have a severely negative impact on sound quality?

-Tue
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Old 3rd February 2012, 11:53 PM   #9
Bill_P is offline Bill_P  United States
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The dimensions look very close to me. Contacts are silver for both relays so I don't expect a difference in sound. Regarding the price, I am sure the seller would accept more if you offer.

The drawings for both relays are attached. Check the dimensions yourself to verify fit in the PC board.
Attached Files
File Type: pdf DEC-dh_2.pdf (165.5 KB, 140 views)
File Type: zip Tyco 48V DPDT Relay.zip (191.9 KB, 80 views)
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Old 4th February 2012, 12:29 AM   #10
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Bill_P, thank you very much for your help. You really went out of your way to help me and i'm very grateful for that.
I just ordered 3 of the mentioned relays, and i'm looking forward to getting my AMP backon track.

Once again, thanks!
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