6U5 "Magic Eye" tubes are rare and hard to find. The more common version was the 6E5. They are pin for pin equivalent but have sightly different characteristics. In some instances a 6E5 can be subbed for a 6U5 but not always.My old RCA valve book has 6U5 and 6G5 listed as equivalents and can be used to replace 6H5 and 6T5.
6E5 is listed as a sharp cut-off triode while 6U5 is remote cut-off.....whatever that means.
Today's Pondering - How Long before the already Foreign Language of Valves becomes a Dead Language in Electronics
LifeHack # 1723...
med, this butt-ugly hack is just for you. I figure it's at least 25% Doc Brown. Short version: The BluRay player I got for the kids' bedroom doesn't have a rear USB; I wasn't willing to put up with the cable to the HDD sticking out the front just waiting to get broken off, so I added a port. Or three. (SNIP)
I guess I'm a bad influence aren't I? Welcome to the dark side.
Dude... I grew up on a farm. "Ugly but it works" was a way of life; there were days I made 3 impossible cobbles before breakfast.
mnem
Then how come you jumped in my shit about the 2465 fan hack??? Hypocrite!!!
'Cuz it was bigger?
Probably because it was a 2465.
After reading about the magic eye tubes I had to go out to storage to plug in my old ESI 250-DA RLC bridge that I haven't powered up in years. It still works and the 6E5 tube is strong and doesn't exhibit fading as well used weaker tubes do.
I also have an RCA Chanalyst like the one shown in the photo that used 4 of the magic eye tubes.
6U5 "Magic Eye" tubes are rare and hard to find. The more common version was the 6E5. They are pin for pin equivalent but have sightly different characteristics. In some instances a 6E5 can be subbed for a 6U5 but not always.My old RCA valve book has 6U5 and 6G5 listed as equivalents and can be used to replace 6H5 and 6T5.
6E5 is listed as a sharp cut-off triode while 6U5 is remote cut-off.....whatever that means.
It's been many years and I can't recall the difference between a sharp cut-off triode vs a remote cut-off triode. I'd have to dig out my RCA Receiving Tube Manual and check. Back in 1980's I had a Stromberg-Carlson multi-band receiver that used a 6U5 but the tube was dead. I searched a long time and couldn't find one. But I had a tube substitution manual that stated in some cases a 6E5 would work. That tube was still available NOS from GE. It did work but so-so. The shadow wasn't as sensitive as I figured it should have been.
The parts touched by the retrofit are listed in the retrofit kit manual: https://www.keysight.com/upload/cmc_upload/All/08566-90151.pdf
It's not quite as simple as I said; the retrofit also replaced the front panel keyboard and a handful of passive components. I believe it also replaced the rear panel of the RF unit.
The parts touched by the retrofit are listed in the retrofit kit manual: https://www.keysight.com/upload/cmc_upload/All/08566-90151.pdf
It's not quite as simple as I said; the retrofit also replaced the front panel keyboard and a handful of passive components. I believe it also replaced the rear panel of the RF unit.
Will not be easy finding all the missing parts. Probably better reusing a broken 8566B.
After reading about the magic eye tubes I had to go out to storage to plug in my old ESI 250-DA RLC bridge that I haven't powered up in years. It still works and the 6E5 tube is strong and doesn't exhibit fading as well used weaker tubes do.
I also have an RCA Chanalyst like the one shown in the photo that used 4 of the magic eye tubes.
Ero-Shan's got a magic eye watching us, now.Sorting through a box of old tubes and stumbled on one I have.
Anyone want it for a project ?
Ordinarily i'd be tempted to say "ME!" but i'm too busy working on my novel or working myself half to death for profit.
Magic eyes are so cool, but I had to resist as well. Too much in the queue! *sigh*Just for neo, an RCA 6U5 plus base and ~300mm leads
-snip-
Pulled from a then very old valve receiver.....decades ago.
Glass envelope slightly loose in base.
Filament checks OK @ 5.7 ohms
I've never seen a 6AF6 either. Can't imagine what it would look like.
My RCA Receiving Tube Manual is dated 1970 so it pretty near the end of the vacuum tube era. But the nice thing is that it covers tubes from the late 1920's right up to the 10 and 12 pin "compactron" tubes which were very common before the end of production.
I've never seen a 6AF6 either. Can't imagine what it would look like.
My RCA Receiving Tube Manual is dated 1970 so it pretty near the end of the vacuum tube era. But the nice thing is that it covers tubes from the late 1920's right up to the 10 and 12 pin "compactron" tubes which were very common before the end of production.'bout the time I got a bit interested in valves and by then my copy was already looking pretty second hand.
Yeah the stuff in mine goes waaaay back too.
A much later Telefunken pocket book I was given in the 80's doesn't compare to the old RCA one.
Ya want this 6U5 before neo changes his mind ?
"6E5 is listed as a sharp cut-off triode while 6U5 is remote cut-off.....whatever that means."
Quote"6E5 is listed as a sharp cut-off triode while 6U5 is remote cut-off.....whatever that means."
Sharp vs remote is kind of like gain in that the sharp cutoff happens more abrupt with grid voltage change and remote happens more slowly (not an exact definition).
Found some pictures. 6AF6 dual magic eye.
That's my plan. Unless I magically managed to find one of these retrofit kits. It really doesn't affect anything for standalone operation. However, I eventually want to take advantage of HP-IB stuff. National Instruments makes a GPIB adapter that works with HP gear.
6U5 "Magic Eye" tubes are rare and hard to find. The more common version was the 6E5. They are pin for pin equivalent but have sightly different characteristics. In some instances a 6E5 can be subbed for a 6U5 but not always.My old RCA valve book has 6U5 and 6G5 listed as equivalents and can be used to replace 6H5 and 6T5.
6E5 is listed as a sharp cut-off triode while 6U5 is remote cut-off.....whatever that means.
That's my plan. Unless I magically managed to find one of these retrofit kits. It really doesn't affect anything for standalone operation. However, I eventually want to take advantage of HP-IB stuff. National Instruments makes a GPIB adapter that works with HP gear.
Got a prologix and keysight gpib adapter and both are working fine with older HP gear (HP-IB)
Still working on a final idea for the Knob and Feet thread. But Chalk up another fix for 3D printing and TEA unobtanium. Went with a single piece instead of two which would have been an injection moulded limitation with the original. Removed the second shearweb to save on support material and it doesn't seem to be an issue. V2 of the design will do away with the need for a spacer washer and a slightly wider PCB gap.
Those brackets turned out really well, bean. Bravo!