 Gardener HT Transformer Restoration Project
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Proud Mary
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Sat Mar 07 2009, 02:51PM
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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
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Object: To restore this lovely but neglected transformer to its original cosmetic condition, appearance, and functionality.
Description: Gardener HT transformer. Secondaries 1500-1250-0-1250-1500V 180mA. Early 1950s vintage.
Initial tests: Insulation (Takeda Riken High Megohm Meter on 1000V range) Good.
Temperature Rise Above Ambient After 24 Hours Unloaded: 9 Celsius. Good
Magnetostrictive Hum: Slight. Good.
Faceplate Terminal Condition: Ceramic feedthroughs GOOD
Terminal Condition: Corrosion. Poor.
External Barrier Insulation: Pitch has become brittle and can be flaked off with thumbnail. POOR
Restoration Plan:
After careful documentary photography of wiring, the faceplate is to be removed, and all terminals replaced and the cermaic insulators chemically cleaned. The faceplate is to be re-surfaced and coated with PCB lacquer.
The pitch barrier layer is to be removed, and replaced with new black conformal coating of similar appearance to fresh pitch.
All exposed metal parts to be resurfaced.
Time Fame: 2 weeks.
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