On 3/6/2020 10:14 AM, David Campbell wrote:
Replaced all of the electrolytics and tantalums, quite a chore to get the exactly correct values
Why? How did you determine that the electrolytics needed to be replaced? I have many HP instruments of that vintage that still meet spec and have never needed to have any of their caps replaced, including my 651B which was last used yesterday.
You cannot buy new caps that are anywhere near as good as the originals used by HP.
* used an AWG and good analog scope in place of distortion meter (its just a sine wave...)
That's fine if you just need test equipment, but your 651B is no longer an instrument if you don't know its specifications.
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Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
