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ronbryan · 20th Apr 2021, 5:37 pm

David

Thanks for the comment about film resistors. It looks as if I shall need to find at least one film type. I'll look into the possibility of surface mount resistors, but they may need leads added to stretch the connections to fit in a pcb designed for wire-ended resistors.

I've just had a closer look at the device pinouts shown in Section 4.4 of the manual. From note b) at the bottom of the page, referring to the Q100b FET sketch, it says that "Leads are used as shown (source and drain are reversed from the vendor's designation)". So it seems that Tek were happy with reversing the channel connections when they chose to use the substitute FET the right way up. That is quite a result for me as it takes away the uncertainty about the lead swap.

Ron

20th Apr 2021, 5:37 pm	#6
ronbryan Octode Join Date: Jan 2003 Location: Guildford, Surrey, UK. Posts: 1,959	Re: Tektronix P6201 FET Probe repair David Thanks for the comment about film resistors. It looks as if I shall need to find at least one film type. I'll look into the possibility of surface mount resistors, but they may need leads added to stretch the connections to fit in a pcb designed for wire-ended resistors. I've just had a closer look at the device pinouts shown in Section 4.4 of the manual. From note b) at the bottom of the page, referring to the Q100b FET sketch, it says that "Leads are used as shown (source and drain are reversed from the vendor's designation)". So it seems that Tek were happy with reversing the channel connections when they chose to use the substitute FET the right way up. That is quite a result for me as it takes away the uncertainty about the lead swap. Ron Attached Thumbnails