For sale pair Toshiba 2SK117GR in matched pairs matched to 0.01-0.015mA) price is 4eur/pair.
Two of them equals to one 2SK170BL with slight higher amplificaton, even lower capacistance and also with lower resistance (desirable feature for R2R dac output) they are They are 100% genue(dealing with Toshiba for 10 years) most of the them are in 4.3mA to 5.8mA range. If you want extreme ranges they are also available( lowest 3.12mA, highest 6.21mA).
matched quads is also possible, 8of them makes nice Patrick's SEN for r2r DAC I have tried SEN CEN with sj74/sk170 and SEN sk170 x4 but 8x sk117GR sounds nicer- better bass and dynamics.
I have 2kohm Vishay RNCY90 to go with those as well.
Two of them equals to one 2SK170BL with slight higher amplificaton, even lower capacistance and also with lower resistance (desirable feature for R2R dac output) they are They are 100% genue(dealing with Toshiba for 10 years) most of the them are in 4.3mA to 5.8mA range. If you want extreme ranges they are also available( lowest 3.12mA, highest 6.21mA).
matched quads is also possible, 8of them makes nice Patrick's SEN for r2r DAC I have tried SEN CEN with sj74/sk170 and SEN sk170 x4 but 8x sk117GR sounds nicer- better bass and dynamics.
I have 2kohm Vishay RNCY90 to go with those as well.