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Old 6th June 2009, 10:51 PM   #1
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Default NAD PP1 modding, psu and others

Hey,
I have recently come into possession of quite an Ok-for-free setup (Mission 701s and a CEC DQ 720, other fun too ) but the NAD PP1 audibly clips the signal. Awfully so, so much to actually not listen any more.

On opening it, there is one measly regulator, and little filtering. But worst - a 5532. Has anyone poked at this unit and changed the amp? Psu? First thing I'd do is dedicated regulators!
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Old 7th June 2009, 05:15 AM   #2
Werner is offline Werner  Europe
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What cartridge are you using that it makes the PP1 clip???
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Old 7th June 2009, 05:24 AM   #3
mlloyd1 is offline mlloyd1  United States
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Overload considerations in RIAA preamps

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Old 7th June 2009, 07:41 AM   #4
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Forgive, I did search, but not specifically concerning the 5532.

I'm not sure, but if I had to hazard, it'd be a MM. There appears to be no information on the cartridge itself, and very very sparse info on the DQ720 online.

First thing is to tidy that PSU though. Pity all my gear (scope and meter etc) is at work, as it'd be very nice to drive it hard and see what's happening where, and make the relevant adjustments.

From what I've digested elsewhere on the net, the 5532 isn't Satan personified, but does suffer drastically if fed with an awful supply. And honestly, a SINGLE Regulator isn't the way forward.

L
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Old 9th June 2009, 10:36 PM   #5
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removing the original CEC RS-1 cartridge and installing an Audio Technica AT-91 in its place, just to rule out it being shot. Any experience with said cartridge?
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Old 11th June 2009, 08:47 PM   #6
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better build the salas phono and shunt
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Old 15th June 2009, 08:39 PM   #7
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Changed the cartridge today, aligned it to (roughly) Loefgren and off I went. Major major improvement.
Not too hot on the PP1 now though, might start prodding in there.

But even still, Comfortably Numb has a whole new feeling on vinyl
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