Hmmmmmm....
model J2sj109 PJF(Beta=39.21m Rs=0 Rd=0 Betatce=-.5 Lambda=4.338m Vto=-.5762
I have the pcb's and most parts but open question to all, because a 2SJ109 is basically 2X2SJ74's thermally bonded, has anyone tried them on the input to the Alpha-J?
wouldn't be hard to adapt. I bought a pair of these from Denmark years ago, BL grade. not that they are hard to pull from equipment, lots of amps and preamps use them, like my Acurus RL-ll in the output with their compliment or lots of Classe CA series on the inputs. But I did pay a premium for NOS, BL grade from an estate (I think)
I also have another question, has anyone tried QFets as subs??? I've seen that Mr. Pass has greenlighted FQA25N20 (probably got a letter or number wrong) but how about something a bit more high powered
I have a pile of tru-blu, supply chain verified, FQA46N15's, enough to match them. can I just substitute or maybe complete instability. the rds on values and other features are quite attractive for a design like the Alpha-J
any input is appreciated, I'd like to assemble the pcb's fairly soon and crudely mount to a heatsink, just to experiment. if successful maybe an interesting amp project in progress
these are just questions I have because I'm in a mode where I'm trying to adapt my stock to some cool experiments.
I'm sure many will be able to relate on this forum
shawnra
model J2sj109 PJF(Beta=39.21m Rs=0 Rd=0 Betatce=-.5 Lambda=4.338m Vto=-.5762
- Vtotc=-2.5m Cgd=67.64p M=.2562 Pb=.3905 Fc=.5 Cgs=61.12p
- Isr=158.7p Nr=2 Is=15.87p N=1 Xti=3 Alpha=10u Vk=100
- Kf=109.9E-18 Af=1)
I have the pcb's and most parts but open question to all, because a 2SJ109 is basically 2X2SJ74's thermally bonded, has anyone tried them on the input to the Alpha-J?
wouldn't be hard to adapt. I bought a pair of these from Denmark years ago, BL grade. not that they are hard to pull from equipment, lots of amps and preamps use them, like my Acurus RL-ll in the output with their compliment or lots of Classe CA series on the inputs. But I did pay a premium for NOS, BL grade from an estate (I think)
I also have another question, has anyone tried QFets as subs??? I've seen that Mr. Pass has greenlighted FQA25N20 (probably got a letter or number wrong) but how about something a bit more high powered
I have a pile of tru-blu, supply chain verified, FQA46N15's, enough to match them. can I just substitute or maybe complete instability. the rds on values and other features are quite attractive for a design like the Alpha-J
any input is appreciated, I'd like to assemble the pcb's fairly soon and crudely mount to a heatsink, just to experiment. if successful maybe an interesting amp project in progress
these are just questions I have because I'm in a mode where I'm trying to adapt my stock to some cool experiments.
I'm sure many will be able to relate on this forum
shawnra