Thanks guys the NAD it is.
Senior Member
Location: Bournemouth
Posts: 5,271
I'm Dan.
Thanks guys the NAD it is.
Pre & Power
Technics SUC 909U & Technics SE A909S
Turntable
Thorens TD 125 MK1 , SME 3009 S2 Non Improved , Shure V15 II , SME 2000 Plinth
CD Transport & DAC & PSU
Marantz 6005 , Beresford Caiman , Paul Hynes SR4
Loudspeakers
Tannoy 615 MK2
Captain Insightful
Location: Seaford UK
Posts: 1,861
I'm Dennis.
Those floating sockets are the large variety, and they did originally have two fibre washers, one with three semicircular circumferentially positioned cut-outs for the three mains conductors, and the other with one central hole through which the larger whole cable passed.
The three holed 'washer' went underneath the three conductors and against the plated brass terminal screws, and the other washer went above the three conductors and clamped them between the two when the cover was tightened.
I have a few of the larger ones in my loft from 1969, and also the two terminal ones which were used by the BBC for loudspeaker connection to amplifiers.
Senior Member
Location: Bournemouth
Posts: 5,271
I'm Dan.
Warming them up...
Pre & Power
Technics SUC 909U & Technics SE A909S
Turntable
Thorens TD 125 MK1 , SME 3009 S2 Non Improved , Shure V15 II , SME 2000 Plinth
CD Transport & DAC & PSU
Marantz 6005 , Beresford Caiman , Paul Hynes SR4
Loudspeakers
Tannoy 615 MK2
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I'm Grant.
The grill or the grille ?
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Senior Member
Location: Middlesex, UK
Posts: 4,482
I'm Alex.
Long term, the 303 is a good choice. I forgot to mention that the 57 is almost a short circuit to the amp at DC due to it's input transformer, a bit like the LS3/6. This is fine on direct coupled amps when their offset is close to zero, however, if this drifts, one could be in trouble. There may be circuits in the amp to protect, but there may not be.
The 303 is capacitor coupled, so removes the above problem, that is, if the output caps haven't failed, but good ones should last for many years.
I believe that the early 303's were fitted with better quality output and smoothing capacitors, indeed, I have a 303 from about 1967 with it's original output and smoothing caps, still fine, however, much later 303's including one built in the 80's, have needed them replacing.
Spendorman
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Location: Romford
Posts: 11,079
I'm sorted.
Originally Posted by dantheman91
Senior Member
Location: Bournemouth
Posts: 5,271
I'm Dan.
Initial Testing not good i don't think
Both Treble units no output i think no expert - 1 speaker down on output the other Bass units working Couple of Hours charge up i presume if the treble units are working they should work right away?
How long for a prolong test?
Should i leave them on over night and test them again tomorrow?
Last edited by dantheman91; 20-03-2018 at 15:31.
Pre & Power
Technics SUC 909U & Technics SE A909S
Turntable
Thorens TD 125 MK1 , SME 3009 S2 Non Improved , Shure V15 II , SME 2000 Plinth
CD Transport & DAC & PSU
Marantz 6005 , Beresford Caiman , Paul Hynes SR4
Loudspeakers
Tannoy 615 MK2
Senior Member
Location: Middlesex, UK
Posts: 4,482
I'm Alex.
Sorry to hear that.
Charge depends on several things, but I would expect to hear treble by now.
If it is just the treble unit, they can be changed reasonably easy with care. It must be over 30 years since I changed mine, but I seem to remember that the units came with fairly simple instructions. You can probably get from Quad the 57 service supplement, or download from the internet.
Spendorman
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Location: Troon
Posts: 2,476
I'm tony.
Feck.....
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Location: The Black Country
Posts: 6,089
I'm Alan.
It might be the high voltage block, they are known to 'sag' over time. Sometimes one or a few of the individual rectifiers fail, so you end up with a lower voltage than should be.
The treble panels should have about 1500V on them and the bass panels about 6000V on them. If the voltages are low you do still get some output but dependent on the voltage level.
To measure these voltages you need a very high resistance probe to connect to a multimeter, otherwise the measuring kit can pull the voltage down.
I have a self made high resistance probe that you are welcome to borrow if you feel confident to use it.
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