BrenAgain 7 Posted Tuesday at 11:27 AM Posted Tuesday at 11:27 AM Currently trying to repair an Amber 3501 test set...circa 1988. Checking out whether it might be possible to improve the input section with modern semiconductors...particularly since the 2SK146 Dual JFETs are unobtainium....Thinking some members might give me some pointers. 5
Half Life 1,287 Posted Tuesday at 08:20 PM Posted Tuesday at 08:20 PM Welcome from Virginia! Enjoy your stay! 1
BobTFM35 3,119 Posted yesterday at 12:12 AM Posted yesterday at 12:12 AM Welcome!! What kind of Carver gear do you have? 1
jmcipale 154 Posted yesterday at 02:10 AM Posted yesterday at 02:10 AM If my memory serves, you can look at PartsExpress for a comparable part. I don't know/cant recall if that is a National Semiconductor, Motorola or Hitachi part. Worst case, ask chatgpt or geminiAI for a compstible replacement part. 1
Half Life 1,287 Posted yesterday at 08:26 AM Posted yesterday at 08:26 AM Mouser says: https://www.mouser.com/datasheet/3/1206/1/jfet-ifn146-interfet.pdf Good luck! 1
BrenAgain 7 Posted 18 hours ago Author Posted 18 hours ago Many thanks guys....and Half Life hit the jackpot..the datasheet actually states it's a drop-in replacement for the 2SK146...with a better noise figure....the Amber may live again...!!...I was nearly giving up...actually started looking for a used QA403... I do need to come clean and admit I don't own any Carver gear...although have repaired some in my time. ...does that count...? 2
BobTFM35 3,119 Posted 15 hours ago Posted 15 hours ago Being exposed to Carver gear counts in my eyes. All it takes is that first step. Could it be a nice Carver SD/A-390t 5‑Disc Carousel CD Player, or one of the many amps that Bob has designed. My first step was a TFM 35, and after that .... Dip your toe once and the rest will be history. Good luck on your restoration of the Amber, its kind of a cool looking piece of equipment. 3
Half Life 1,287 Posted 14 hours ago Posted 14 hours ago 1 hour ago, BobTFM35 said: Dip your toe once and the rest will be history. Damn Bob! That is a sweet setup! Will you adopt me? I know how to use a lawn mower! 😁 1 1 1
BobTFM35 3,119 Posted 13 hours ago Posted 13 hours ago (edited) @Half Life Thanks. And the answer is Yes! Forget about the grass too many CCR records to spin. I use to live on the other side of the James River for over a year, long ago, Langley. Spent many a weekend at Virginia Beach, Norfolk for a variety of reasons. These are the other units on the left side of the three bay. Edited 11 hours ago by BobTFM35 1 2
Half Life 1,287 Posted 2 hours ago Posted 2 hours ago 11 hours ago, BobTFM35 said: I use to live on the other side of the James River for over a year, long ago, Langley Yep, know that side of the water. Many moons ago, did a large networking project for the 480th. Enjoyed going there every day for about 6 months. 1 1
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