Greetings to all of the timekeepers on the list. I have been enjoying the discussions here for some time.
I am attempting to get an HP-117A VLF Comparator operational. I had to change an electrolytic cap in the active antenna and now have a strong signal into the receiver. I have a problem with the A-7 (00117-6020) plug in board. This is the same as the A-5 board. The 60 Kc filter in the times 3 multiplier is not working reliably. I suspect the transformers T-1 (00117-8004) or T-2 (00117-8005). Does anyone know where I could get an additional A-5 or A-7 board or the transformers or a second unit (working or not)?? Any help would certainly be appreciated. I picked up some chart paper at a yard sale labeled as follows: Mfg Amprobe; part numbers 300 SWA and 830W which appear to be the correct size for the 117A. I have not yet tried it though. I do have the actual manual and plastic overlay charts which I could copy if there is an interest. Reply to [email protected] or [email protected] <mailto:[email protected]> Gordon
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