While troubleshooting the TR-4 filters I thought it would be useful to see if this old Signal Generator still worked. This is one of the pieces from Bill's old heathkit test gear. I took the cover off to dust it off and check it out. I sparyed some DeoxITD5 on the pots and switches. The bandswitch felt 'locked' so I took the knob off and turned it with a wrench and it loosened right up so it was powered up and seemed to work once all the swithes and pots were 'exercised' a bit.
 |
| Heathkit IG-102 |
 |
| Top showing 12AT7 and 6AN6 both original tubes marked Mullard and Heath |
 |
| Bottom showing variable cap and coils |
I looked at the output on my scope and it looked 'OK' to use for a lot of test and repair purposes. I hooked up the two Drake TR-4 filters and could see the one that worked passed a signal about 3-4 DB down from the input signal when the generator was tuned to the filter frequency and the 'bad' filter would not pass a signal at all. With the frequency counter and the scope one could plot the response if the filter was terminated 'properly' .
