Intermittent left channel

[TUBEDUDE]

I see the problem:
Too much sand and not enough vacuum.

[pompeiisneaks]

Those are definitely relays. Your soldering? Did you desolder and resolder them? or are you replacing them? If you just removed them, and replaced them, and the problem is resolved, it may have just needed a reflow of the solder joints, If not you should be able to lookup that NEC relay part number and replace them with the same type or one that's got the same specs and same footprint.

The soldering looks good to me, not too much solder, and it looks like it's flowed into the joint well, but also be careful on PCB's to not heat the pads too long as you can cause the traces to tear off etc and require some other work to get the amp functional again.

~Phil

[TomJS]

I see the problem:
Too much sand and not enough vacuum.

There is no sand in it that I can see, it is a bit dusty but its really hard to get all the dust out since it's quite old dust do you guys have a trick? I don't have an air compressor.

[TomJS]

Those are definitely relays. Your soldering? Did you desolder and resolder them? or are you replacing them? If you just removed them, and replaced them, and the problem is resolved, it may have just needed a reflow of the solder joints, If not you should be able to lookup that NEC relay part number and replace them with the same type or one that's got the same specs and same footprint.

The soldering looks good to me, not too much solder, and it looks like it's flowed into the joint well, but also be careful on PCB's to not heat the pads too long as you can cause the traces to tear off etc and require some other work to get the amp functional again.

~Phil

I desoldered and resoldered them, and it seems like the problem has been fixed but I haven't connected it to my main set of speakers still using my cheap test car speaker. At first, I thought I broke a relay by soldering since speakers B worked and A didn't but then I thought okay let's try to measure them and then I thought o wait I pulled out a cable to get the relays out maybe I should reconnect it and yup then the speaker A relay worked again, so yeah rooky mistake! Here a picture of this heavy beast before I close it up:

IMG_1645.jpg

[martin manning]

Good work! TUBEDUDE is joking... Sand is mostly silica, SiO2. Si is the principle semiconductor from which transistors are made, so solid state stuff is referred to as "sand" by buis enthousiastelingen.

[TomJS]

Good work! TUBEDUDE is joking... Sand is mostly silica, SiO2. Si is the principle semiconductor from which transistors are made, so solid state stuff is referred to as "sand" by buis enthousiastelingen.

O HAHA Well I guess I could expect people joking about a transistor amp on a tube amp forum but If you ever get a chance to pick one of these amps up, do! It's the opposite of a tube amp though not warm at all but like I said very flat and neutral but with a very open high end.

[TomJS]

I see the problem:
Too much sand and not enough vacuum.

There is no sand in it that I can see, it is a bit dusty but its really hard to get all the dust out since it's quite old dust do you guys have a trick? I don't have an air compressor.

Now I feel embarrassed about this message, but do you guys still have a trick to remove old dust?

[martin manning]

Compressed air is good if used with care, or, you can get cans of "dust-off" or similar product, and/or use a small paintbrush. Any of this is best done outside.

[Tony Bones]

errr... never mind.

[TUBEDUDE]

Sorry TomJS,
I come across as a smarmy bastard sometimes....because i am. Didn't mean to sow confusion.
That has a hell of a heatsink. Is there forced cooling also?

[TomJS]

Sorry TomJS,
I come across as a smarmy bastard sometimes....because i am. Didn't mean to sow confusion.
That has a hell of a heatsink. Is there forced cooling also?

No it was a good joke except I didn't get it at first, but it was a good joke so yeah. Forced cooling, you mean active as in a fan? If so no this is a passive heatsink without a fan. This amplifier is meant to produce 100 Watt RMS and 370 Watt peak into 8 ohm but NAD is known for having conservative ratings so I guess that's why it needs such a big heatsink.