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Old 5th October 2010, 08:15 PM   #1
EspenE is offline EspenE  Norway
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Join Date: Jun 2003
Location: Oslo
Default Nakamichi Stasis PA-5E MkII

I have a Nakamichi PA-5E MkII.
The mains power fuse blows the second I switch the amplifier on.

I cannot see anything wrong inside the amp: no burned components, no appearent cold solder joints.

Do anyone have any idea on how I should proceed on this?

Thanks, Espen
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Old 6th October 2010, 12:10 AM   #2
VHF man is offline VHF man  Australia
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Join Date: May 2007
If there are internal fuses on the +/- rails for each channel then replace them with 10W 47-100 ohm resistors - on both channels. That will allow you to measure and compare quiescent currents. If the mains fuse still blows then you probably have a short cct bridge rectifier. You should be able to check the BR's in cct with a DMM.

A blown bridge is pretty common with an old amp.
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Old 6th October 2010, 03:18 AM   #3
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Location: Los Angeles
Quote:
Originally Posted by VHF man View Post
If there are internal fuses on the +/- rails for each channel then replace them with 10W 47-100 ohm resistors - on both channels. That will allow you to measure and compare quiescent currents. If the mains fuse still blows then you probably have a short cct bridge rectifier. You should be able to check the BR's in cct with a DMM.

A blown bridge is pretty common with an old amp.
Really? I find that to be a pretty rare failure - at least in the US.

G≤
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Old 6th October 2010, 06:34 AM   #4
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Join Date: Jun 2009
Quote:
Originally Posted by EspenE View Post
I have a Nakamichi PA-5E MkII.
The mains power fuse blows the second I switch the amplifier on.

I cannot see anything wrong inside the amp: no burned components, no appearent cold solder joints.

Do anyone have any idea on how I should proceed on this?

Thanks, Espen
Could be

The mains transformer,
Shorted bridge or diodes,
Shorted output transistors,
shorted filter caps (usually quite rare),

regards
Trev
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