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想開始整Marantz7 (PA-1)pre-amp, 但有問題想問

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1#
andypoon 發表於 2009-2-23 09:41:09 | 顯示全部樓層
[quote:f15d7dbd28="icefireman"]Accphoto,

I am using the M7 PCB which you sold to me half year ago.  The dimension of the PCB is 17.5 X 21cm.  It is quite large so that I need to use the bigger case which must be 43cm wide one.  Do you have that size spare case in your stock?  Thank you

Another question:
Is Aluminium case good for connect the ground wire?[/quote]

Dear icefireman,

You can try searching in 麥X in 女人街鴻光商場,I noticed there are some tube amp cases available.

Andy
2#
andypoon 發表於 2009-2-23 19:04:30 | 顯示全部樓層
[quote:91840b1c75="icefireman"]Thank you all the brothers' info.  About the case, I have ordered an Aluminum case in China.  It was R$520 (I tried to show the case later).  

About the switch, I have to thank Alcat and Accphoto.  Both gave me alot of info.  Finally, I decided to add a 0.1uf cap between the switch (L).  And I would pick the simple action was turning on pre-amp and then turn on power amp 20s later.

One more question is about the fuse.  I should hook up L -> fuse -> switch -> transformer or N -> fuse -> transformer?[/quote]

Dear icefireman,

Always connect in this way: L -> fuse -> switch -> transformer

A better way is to use a 2-pole switch like this:
L -> fuse -> switch -> transformer L
N ----------> switch -> transformer N
and you need two capacitors if you use 2-pole switch.

Andy
3#
andypoon 發表於 2009-2-25 08:54:03 | 顯示全部樓層
Hi icefireman,

You need 2 of them if you are using a 2-pole switch.

Andy
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