8 Super-Matched 2SK170 (BL)

Toshiba Super-Matched Octet

Total 8 pcs Ultra-Low-Noise

J-FET Audio Transistors

9.0 - 11.9mA Range ("BL")

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These JFETs were matched at a constant 72F degrees using a meticulous lab process.

JFETs are inserted into a custom 90-socket gold-pin ZIF test jig (30 devices per test).

A well-regulated and carefully monitored DC supply voltage of 9.00V (not 9.01V) is

applied while FETs are allowed to stabilize for at least 5 minutes before testing.


Current (Idss) and voltage (Vgs) are then measured quickly on a calibrated

Agilent 34401 6-1/2 digit meter. FETs are matched in pairs to within 0.03mA Idss

AND 4mV Vgs. In some cases, the matching is within 0.01mA and 1mV. The

actual measured Idss and Vgs is noted on each packing bag. 


ALL 8 FETs will be matched to within 0.03mA and 4mV Vgs. Only a few octal-match sets

can be achieved in a production matching run. When they're gone, they're gone.

 The earliest buyers will have the best chance of receiving the most perfect matches.

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Brand New - From Original Toshiba Boxes & U.S. Authorized Distributor

TO-92 Package - Uncut - Unsoldered - Tested - Matched 

Sale is for 8 pcs (8ea 2SK170, all super-matched) "BL" current range (9-12mA range).

Insured Priority Mail to 50 States $8.85. International typically $42 for insured USPS Priority Mail.

31-Day Returnable only if not as described, and must be uncut and unsoldered.