Posts Tagged ‘IG-42’

Heathkit IG-42 Signal Generator Restoration – Part 4

Cabinet Repair Now the the IG-42 was in good electrical order, it was time to move on to the cabinet repair.

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Heathkit IG-42 Signal Generator Restoration – Part 3

Line Cord and Chassis repair — To continue on with the restoration, I replaced the ceramic disk filter capacitors on the line cord input with safety capacitors.  These are designed to fail to an open state, rather than a shorted state.  We hope that they never fail, but if they do, it should leave the […]

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Heathkit IG-42 Signal Generator Restoration – Part 2

Electrolytic Can Capacitor Re-stuffing Next on the repair plan is to pull the 3-section electrolytic can capacitor, and re-stuff it with modern electrolytic capacitors.  This will ensure reliable operation for decades into the future, while preserving the looks of the old equipment.  I unsoldered the two resistors, the .05 uf capacitor and the various wires […]

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Heathkit IG-42 Signal Generator Restoration – Part 1

The first fix applied to the IG-42 Signal Generator was the replacement of the 0B2 regulator tube. With the new old stock replacement, the B+ voltage dropped from 131 vdc to about 107vdc. The 0B2 is a 108 volt regulator, so that should be about right. The new tube voltage chart is displayed below. I […]

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Heathkit IG-42 Checkout – Part 2

I put the IG-42 Signal Generator back on the bench to continue my initial inspection.  Today, I measured the voltages specified in the construction manual and measured the resistors (in circuit) to see if there were any obvious problems to address. Some of the tube pins were very difficult to access from the bottom side, […]

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