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NAD 2700 Relay Help

mcaddie7

mcaddie7

Active Member
I have a NAD 2700 and I heard the output relays go in these? I cleaned the pots with Deoxit but at lower volume it occasionally has a bit of static. Loud appears fine and no scratch when turning knobs.

Could this be bad relays?

Would these work? https://www.ebay.com/itm/1148195435...Ee0_Gs4SHe&var=&widget_ver=artemis&media=COPY.

Willing to take any other suggestions for the problem. DC offset is 0 and idle bias is died to 7.5mv.

The main caps read 8500 each and have a small bulge on the top. I know they are supposed to be 10,000uF. Should I replace these?
 
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I used the relays that pwauk12 suggested recently, so I can second the suggestion. There will be some minor fuss. Two of the pins are larger than the NAD's circuit board is drilled for, so either the pins have to be slimmed down with a Dremel or such, or the circuit board holes need to be relieved. (I would bet that the relays offered through ebay would involve the same.)

Also the Newark parts have a lower coil resistance than the originals, so to make sure the relays get enough operating voltage, it would be best to lower the value of the resistor that is connected in series to the two relay coils. I just installed another resistor in parallel with the existing one, but I don't remember the details.
 
chazix said:
I used the relays that pwauk12 suggested recently, so I can second the suggestion. There will be some minor fuss. Two of the pins are larger than the NAD's circuit board is drilled for, so either the pins have to be slimmed down with a Dremel or such, or the circuit board holes need to be relieved. (I would bet that the relays offered through ebay would involve the same.)

Also the Newark parts have a lower coil resistance than the originals, so to make sure the relays get enough operating voltage, it would be best to lower the value of the resistor that is connected in series to the two relay coils. I just installed another resistor in parallel with the existing one, but I don't remember the details.
Click to expand...
Did you use the same resistor in series? Thanks for the confirmation that those are the relays. I’ll order several as I have two amps to do.
 
mcaddie7 said:
Did you use the same resistor in series?
Click to expand...

Not sure I follow. The original circuit has a single power resistor that is connected in series with the two relay coils. I thought it would be a good precaution (excess of caution, really) to lower that series resistance. To achieve that, I added a resistor right across the original one, so that the parallel combination of the two resistors was lower than the original. But I'm afraid I don't remember what part I used.

It's probably not critical to do anything like that at all. The Newark relays are specified to pull in with a coil voltage of only 13.9V, and I think they will still receive a decent margin more than that, even with no resistor change.
 
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