Mission Cambridge amplifier - Mission Power Amp Module 1 - diyAudio
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Old 4th February 2011, 11:51 AM   #1
Aleko is offline Aleko  Bulgaria
diyAudio Member
Join Date: May 2010
Default Mission Cambridge amplifier - Mission Power Amp Module 1


I have the above specified nice little amplifier which served me for years to excellent results.
The power module (Mission Power Amp Module 1) got damaged.
I already made partial replacement of transistors 2SB646 and 2SD666 and resistors of 220 ohm and 390 ohm .
Cannot make it run.
I am clearly not an experienced technician being more an user.

Can anyone provide the curcuit diagram of this amplifier (power module) ?
I am also looking to buy the amplifier or the power module .
The rest of my amplifier which is power supply and pre-amplifier is good.

Thank you

Best regards,
Aleko Markov
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Old 18th May 2011, 01:14 PM   #2
Aleko is offline Aleko  Bulgaria
diyAudio Member
Join Date: May 2010
Default Mission Cambridge

Hi ,

This is to proudly report that the amplifier works .
The repaired channel has an offset at + 0.4 V though .
All transistors replaced with new ones.
But they were not matched as I don't know how to match transistors.
A872 and C1775 on the input .
Appreciate any suggestions for how to match the transistors ?
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