2SJ74 + 2SJ74 + 2SK170 + 2SK170 (BL)

Toshiba Super Matched Quad (2 ea type)

J-FET Audio Transistors

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These JFETs were matched at a constant 72 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 0.1mA Idss

AND 10mV Vgs. Most eBay audio FET resellers do NOT match for BOTH Idss and Vgs.

In some cases, the matching is within 0.01mA and 1mV.

Buyers will receive the tightest matching available, 

prioritized by Idss. 

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Brand New - From Original Boxes & U.S. Authorized Distributor (circa 1996-2012)

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

Sale is for 4 pcs (2ea 2SJ74-BL and 2ea 2SK170-BL). Idss is 7-9 mA range "B" or "BL" 

First Class Mail (USA) $4.50. International First Class $18. Insured Intl Priority $44

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