I have finally got the front panel completed and the instrument reassembled. It took most of yesterday by the time I had checked & double checked the wiring. Today I started on the testing of the various functions. Some minor adjustments to resistors were required otherwise everything seems to be working. There is a discrepancy on the ohms range which needs some investigation. I am still quite in the dark about the value of C3 which is across the DC supply on the "Line Adjust" and "Electrolytic" functions. I originally had it at 0.47mfd which set the Line Adjust at mid tap but that gave 35V on the Electrolytic 25V test. I now have it at 0.33mfd which shifts the Line Adjust three taps but the DC voltage on the Electrolytic 25V test is still 30V. If I reduce the value further to correct the electrolytic voltage I run out of taps on the line adjust? - a bit of a quandary. I think I will try setting it up with a valve in place and measure the heater voltage. This will set the correct tap, then I will have to work on the Line Adjust & Electrolytic tests. Anyway, lots of progress with encouraging results.