The J-310s in my little preamp are kaput - I looked at Mouser but the shipping costs are way too high for a couple of little Jfets - any body have lots of extra J-310 (or equivalent) they could spare
Oooops - forgot to mention quantity -- four would be nice (in case they go south again) Jim R. The J-310s in my little preamp are kaput - I looked at Mouser but the shipping costs are way too high fo
Okee Dokede - someone offered to send me four - he said he has thousands of those J-310s....thanks to all that replied with info! Jim R. The J-310s in my little preamp are kaput - I looked at Mouser
What's taking out the J-310s, Jim? I have some around here somewhere, but it's been years since I've seen them. Did you try Digi-Key? Do you need to modify your preamp a bit to better protect the J-3
Yes, need to add protection! The Argonaut VI has a pin on the ACC jack on the back that goes to plus 12 volts 15 msec before keying the rig - gonna explore using that! _________________ Topband Refle
Jim, The major semiconductor manufacturers (e.g., Fairchild) who once mass-produced JFETS in TO-92 style cases have now "obsoleted" most of them. This occurred approximately 2-3 years ago. When shock
Jim, If you really have trouble getting some J-310s, let me know. I'd really have to hunt -probably out in my garage. The J-310s that I have, if I could find them, are, I expect, at least 20 years ol
As far as am aware On-Semi still make the TO-92 J310. Fairchild ceased production about 2 years back. I did a last time buy from Mouser for several thousand J310 and the much more linear J309. 73 And
I think you are correct regarding ON-Semi, Andy. I think I might check Digi-Key and see what mfr. they list for the J310. 73, Charlie, K4OTV As far as am aware On-Semi still make the TO-92 J310. Fair
Of course, a 12AT7, or better, a 6DJ8, would be excellent preamps as well, and aren't so sensitive to transients etc. :-) (Showing my age, I guess!) As far as am aware On-Semi still make the TO-92 J3
I've found what I'll need, Charlie, courtesy of Andy Ikin! Thanks to all for the assistance on this "project"! 72, Jim Rodenkirch K9JWV _________________ Topband Reflector
Actually, Jim - for 160 and 80m, where you could tolerate some capacitance, you could even try back-to-back 1 amp rectifiers, like IN4004-1N4007. You surely wouldn't blow those out! :-) I'd probably
Thirty years ago I used 6DJ8 (E88CC) to solve a third order IMD problem with tuned loop that was using J310s. The IMD was caused by Radio Free Europe on 13m. 73 Andrew -- Original Message -- From: "C
Yes, we could swing the grids of those tubes quite a ways before encountering enough non-linearity to produce a significant amount of intermod, Andy! The old original AMECO tunable vacuum -tube pream
Charlie, When I was poor man 40 years ago, I always wanted Tektronix 545B Scope, which I couldn't afford. So I built a "Chinese Copy" with discarded parts from the Calibration department of the compu
Gee, that's really interesting, Andy! I also built a much simpler oscilloscope when I was a teenager and new ham! Yours was a really elaborate and impressive 'scope project! Congrats! Glad to hear fr
When I was poor man 40 years ago, I always wanted Tektronix 545B Scope, which I couldn't afford. So I built a "Chinese Copy" with discarded parts from the Calibration department of the computer compa
Glad to hear from someone who has experience with the KAZ and flag antennas. My KAZ was for 160 and terminated in 1000 ohms - mostly because that's what I had on hand. It was a very good RX antenna f
Charlie wrote on Aug. 26. "Your preamp sounds very interesting! It must be fairly elaborate, if it uses 8 of the J309 FETS! I'd be interested in the circuit!" Charlie, I don't disclose circuit diagra
Thanks, Andy I understand your IP and trade-secret issues. That's an interesting approach. I'll have to give it some thought, although I don't expect to be building preamps anytime in the foreseeable