Re: HP34702A Ohms converter issues
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FN2960 sounds like and old Fairchild part number, They used a ceramic body with a drop of epoxy, or molded plastic cases. They used their trademark, a styleized 'F' as part of the part number.
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Michael A. Terrell -----Original Message-----
From: gregdunn@... I put a pair of 2N3904 in for Q13-14 - no change unfortunately. :-( Yes, it's hard to figure out what Q11 needs to be - HP lists 'FN2960' as an equivalent but that doesn't come back with a match for any part. It has been recommended to me that I use a PN4117 which I have placed an order for but it hasn't arrived yet. I stuck in a NTE466 as a quick test, and it did seem to help on the lower ranges but not the highest two. The 466 does have a much higher Vgs rating, though, so that might be a concern. It did test as back-to-back diodes, though, whereas the original Q11 just showed "unknown part" or open depending on what I used to test it. Being a JFET, that's plausible. |
Michael A. Terrell