On my system the bulbs burned out some time ago. Today, I bought a pair of 12v micro lamps at Radio Shack (part 272-1092). Then removed the board behind the display and replaced the bulbs. This required some soldering. The bulbs have held up for more than 6 hours, so I do not think they are going to burn out.
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Funny that you just posted. On Monday, I dropped off my G-7700 at The Audio Lab in Harvard Square, Cambridge, MA. http://www.theaudiolab.com/
As soon as I walked in the place I knew I was at the right spot. They service and sell some really high-end vintage units as well as carry brand new high-end audio equipment. $60/hr for service work. As a gauge, my G-7700 took 2hrs to do a complete overhaul, which included replacing some pots, re-soldering cold joints, calibrating the tuner and other components. i thought it worked really well before!
Experienced, knowledgeable, efficient.
Give them a call and ship your G-7700 to them. It's worth it. MRE
Usually the problem is not that the display is burnt out but the voltage that supplies the filament is missing due to bad solder contacts on the terminals of the display.
If you disassemble the unit so you can see where the display assembly solders into the board check/resolder those terminals.
A 712 is not set up to use an Ipod USB dock. You can buy a dock that will use RCA jacks into an old stereo - Apple sells them, others too. Then the Ipod sits up and you can look at it. Or you can buy the 1/8" stereo plug to two RCA plugs that Radio Shack has been selling for 30-40 years, plug one end into your Ipod headphone jack, and run the two RCA plugs into your Aux input. That costs about $5, and is easy as pie. An Ipod will play through any old receiver, but the USB docks will not plug into them.
The clicking is the sound of a bad relay. A relay is an electrical switch that opens and closes under the control of another electrical circuit. There is no user solution for this. You'll have to take it to an electronics repair shop (~$150) or dump the whole unit.
the lamps i use on all NAD displays(and have done since the early 1990's) last heaps longer.You can get them from RS components in your country. They are a 14v 37ma type, and seem to last. Never had any come back for replacement again. P/N 351-9585. Increasing the ballast resistor where fitted by 25% in valua also helps preserve them