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Tube Amplifiers HomeSchematicsMisc Schematics -» Hiwatt SA412 :

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Hiwatt SA412 Adobe Acrobat Schematic
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Ian Miller – Adelaide, South Oz
October 15, 2012 - 00:43

This is the schematic trace I did when I restored this amp many years ago now.
If building a copy:
This amp had a blown power transformer. Both rectifier diodes were shorted putting a short across the entire HV winding. The HV fuse between the centre tap and 0V gave no protection. If building a copy I suggest 2 fuses for the High Voltage, one in each leg of the AC High Voltage feeds.

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