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Description
How thankful we're for Quad, for instruments and voices
It wondrous things hath done, in which sound world rejoices
From Walker's earliest steps that sent Quad on its way
With innovative gear that still sounds good today
O may this bounteous Quad through all our lives be near us,
With ever joyful sounds that never cease to cheer us;
And keeps us from the craze to upgrade when perplexed;
And frees us from the ill about what to buy next!
All praise and thanks to Quad, which gives musical heaven
Quad II, three-three, four-four, 303, fifty seven,
Although we find it sad that Huntingdon's no more;
The Real Thing soldiers on, and shall for evermore.
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Re: Humming 44
... Hum from the case or the speakers? If from the case it's xfrmr electro-mechanical hum. New OP amps do not necessitate an increase in power used. Maybe if
Posted - Wed May 23, 2012 7:33 pm
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Scott
painintheamp
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Re: Humming 44
In fact I think Stefaan's suggestion f the relay is the most probable cause. It is certainly the cheapest to fix: just replacing the PSU caps and zener diodes
Posted - Wed May 23, 2012 10:48 am
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ejp286
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Re: Humming 44
If it is a loud rattling hum it can also be the relay. Using new (Burr Brown) opamps that consume more power can make the power-rail voltage decrease and this
Posted - Wed May 23, 2012 8:07 am
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Stefaan
stefaanverdo...
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Re: Humming 44
Ok, I'll open it up tomorrow and see if I can isolate the hum. I do have a 66 in hand, so I won't be screwed if I mess something up. I love the 44's tone
Posted - Tue May 22, 2012 11:38 pm
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Sridhar Mahadevan
sridharmahad...
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Re: Humming 44
I have this habit of investigating root causes and and 'unintended consequences' of issues. So, regarding the QUAD 44 hum, my findings are as follows: 1. Age
Posted - Tue May 22, 2012 6:55 pm
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Hamad Sheikh
amplifier_su...
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