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Craig Sawyers · 22nd Apr 2021, 5:03 pm

The input JFETs in the P6201 are unselected. Semiconductors ending with 00 and 01 have no selection criteria.

In the parts list Tek used to mark selected parts with an asterix.

Anyway the original 151-1023-00 was specced by Tek to have an Idss range from 5-15mA/V and Vp(max) of 6V. So the usual bog standard JFET spread.

The later fitted MMBF4416 also ends in -00 again strongly suggesting that it is an unselected part.

Craig

22nd Apr 2021, 5:03 pm	#21
Craig Sawyers Dekatron Join Date: Nov 2010 Location: Oxford, UK. Posts: 4,984	Re: Tektronix P6201 FET Probe repair The input JFETs in the P6201 are unselected. Semiconductors ending with 00 and 01 have no selection criteria. In the parts list Tek used to mark selected parts with an asterix. Anyway the original 151-1023-00 was specced by Tek to have an Idss range from 5-15mA/V and Vp(max) of 6V. So the usual bog standard JFET spread. The later fitted MMBF4416 also ends in -00 again strongly suggesting that it is an unselected part. Craig