Dear All C-hing,

Just modifed from 230V to 220V, the sound seems more 有力, 多了細節.
多謝各位師兄.

LFYeung

Hi 39hkw59,

My front panel is gray in color. It should be last batch of 405.2. thx !

yes, your pic showed the exact 120V transformer layout as mine one.

My Mono Block QUAD 405.2 :-)

Hi Alphability:
閣下部機前面寫了405.2這條Bar顏色是白還是灰色?
Thanks!

Hi Alphability:
這部機Quad 405.2火牛是230v連接弄錯了
正確是同閣下部機120V AC.

Hi Alphability:
這部機Quad 405.2火牛是230v連接.

yesyes reading it, thanks ^.^

Quad 405-2 AC voltage considerations




From serial number 83000 and onwards Quad omitted the AC mains voltage selector on the Quad 405-2.
I recently checked such a late model Quad. It did not perform well. The power delivery was not on spec. On the outside of the unit there was a marking: 220V. But in real life the unit was wired for 240V. The Quad 405-1 had a selector with 6 positions, in the service documentation of the 405-2, only for four voltages is explained how to connect the wire links to the primary windings of the transformer. In the Netherlands the AC voltage is 230V, this is one of the missing voltages in the documentation, and the other is 130V. Because of the design, the DC power supply voltage of the amplifier is proportional to the AC mains voltage. So 130 V or 110 V does matter! To complete the documentation I drawn the missing link positions. You can also use these diagrams to rewire any Quad 405 and omit the voltage selector with those tiny wires. If you can hear a difference? I can’t tell you, judge for yourself. Before you rewire the amp, check the AC voltage during some weeks, check what is really coming out of the mains socket. Click on the diagram to get a fully detailed version, I also added some colour.

Joost Plugge

Hi Alphability:
先看了給閣下的資料後就會明白呀!
http://quadrevisionspot.blogspot.com/

Voltage standard in Hong Kong is 220V right?

So, 230V is fine.

It means that I need to remove those two jumpers as well!

Thanks! 39hkw59 ^.^

Hi Alphability:
資料來原: Quad Spot 是正確不用膽心.
可聯絡Happyquad兄他很有心得熟認Quad產品.
有時我都找他幫忙試試哪!

Hi Alphability:
george1977 兄個部是230V對的
資料來原: Quad Spot:
http://quadrevisionspot.blogspot.com/

改為mono block amp

MAC MOD 405!!!

you know McCormack? he did that

各位C兄
我有2個405-2，吾知有無方法改為mono block amp?

wo! thanks 1fyeung, very helpful.

waiting for QUAD reply. otherwise, I will make a try tmr.

try! haha, may be "BOMB".... ^^"

我個部同george1977個部似乎一樣,請問各位師兄係唔係220v?多謝幫忙.

any additional picture to show Hong Kong version of QUAD 405.2, thanks!

happyquad 感謝幫忙 ^.^

唔該 39hkw59,

不過奇怪, george1977 兄個部220V
有兩條SHORT, 像 230V, 其實george1977 兄個部係...

Hi Alphability:
閣下部機現時AC連接是120AC
可參考資料更換就可以.