- 2024
- Oct
- 29
A Heathkit IG-72 Signal Generator Part 5 - We’re not done yet.
I was warming the device up for final cal. I had just completed it, and put it back in the case. Back on and SNAP.
I did some measurements. Nothing much of note. Removed the tubes, applied power. ZZZZZZZ right on the socket for the 6X4 cathode. WTF???
I removed the wire from the cathode to the filter capacitor. Nothing. I reconnected it to the choke. A nice spark was jumping from one of the plates to the cathode. Removed the wire on the cathode and did a measurement from cathode to plate pins.
There’s nothing connected to this pin other than my meter. 60Ω is not a good measurement. It came and went as the pin was moved around.
It looks like this double-wafer socket may have some carbon tracking inside of it. Oh fun! That means trying to figure out something to replace it. I have some sockets in stock, we’ll see if there’s one that can be used here.
Of course I don’t have the correct socket - these are 1” mounting centers, which is an oddball size. Most are 7/8”. Off to eBay for the rescue!
Stay tuned!
Next part of this series: https://wereboar.com … back-up-and-running/
Previous part of this series: https://wereboar.com … no-need-for-repairs/