Now NAD : SF Pro Reverb advice

jpfamps · November 2017

I'd set it to 240. mains.

Ticking can be very much reduced by attention to the lead dress, but sometimes you need to changed the optocoupler.

ICBM · November 2017

Set it to 240V. It's not whether you can hear a difference, it's whether you're overstressing some components. Unlikely, but no point in risking it. It's possible that the switch is hardwired internally anyway, but best to be safe. Turn it up to 240 and make sure the switch will not turn any further.

No telling what's going on with that added switch - it's a shame it's been bodged like that. I would very much get the amp checked over professionally - the standard of workmanship with strange modifications is often not good.

hywelg · November 2017

Being right next to the speaker jacks it's probably a speaker phase switch.

jpfamps · November 2017

hywelg said:

Being right next to the speaker jacks it's probably a speaker phase switch.

Not a great idea in an amp with negative feedback that one!!

ICBM · November 2017

It could be almost anything. Location means nothing, it could be wherever was most convenient to drill a hole. Sometimes there appears to be no logic at all.

Speaker phase is very unlikely as jpfamps said. Turning off the negative feedback is more possible, but it's still just a wild guess without looking inside.

Corvus · November 2017

Cheers all. Set to 240. Won't be touching the switch till I found out what's going on when the amp gets a once-over. Maybe blackfaced as well depending how the checkup bill costs.

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Now NAD : SF Pro Reverb advice

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