6sn7 single/individual tubes

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  • pitdogg2
    pitdogg2 Posts: 24,919
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    See that saucer getter at the bottom? Every Russian tube will have that style from my experience. So down the road when someone tries to sell you a tube from say Mullard and say it's from blackburn plant and it has a saucer you will know to walk away.
  • Clipdat
    Clipdat Posts: 12,773
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    What part are you looking at specifically to see the "saucer getter" at the bottom?
    pitdogg2 wrote: »
    See that saucer getter at the bottom? Every Russian tube will have that style from my experience. So down the road when someone tries to sell you a tube from say Mullard and say it's from blackburn plant and it has a saucer you will know to walk away.

  • dkfreebird
    dkfreebird Posts: 1,186
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    I’m guessing this one.wv92ijy4aatk.jpeg
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  • Viking64
    Viking64 Posts: 6,836
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    I'm confused. Do those things have snow in them when you shake them?
  • Clipdat
    Clipdat Posts: 12,773
    edited December 2017
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    Got it! Thanks so much for pointing that out, appreciate it.
    dkfreebird wrote: »
    I’m guessing this one.

  • Clipdat
    Clipdat Posts: 12,773
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    I'm about to shake YOU around and see if snow comes out.
    Viking64 wrote: »
    I'm confused. Do those things have snow in them when you shake them?

  • Viking64
    Viking64 Posts: 6,836
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    Clipdat wrote: »
    I'm about to shake YOU around and see if snow comes out.
    Temper, temper. And why do you quote people backwards? :p
  • Clipdat
    Clipdat Posts: 12,773
    edited December 2017
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    I'm not doing it backwards, you are. ;)
    Viking64 wrote: »
    Temper, temper. And why do you quote people backwards? :p

  • pitdogg2
    pitdogg2 Posts: 24,919
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    dkfreebird wrote: »
    I’m guessing this one.wv92ijy4aatk.jpeg

    Yes correct. It's known as UFO or Saucer getter.
  • mhardy6647
    mhardy6647 Posts: 33,345
    edited December 2017
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    Yup. The getter "gets" residual gases and volatile materials left over from manufacturing of the tube, to insure the "hardest" possible vacuum (both for the brand-new tube and over the life of the tube). The little electrons very much appreciate not havin' to bump into other things as they're going about their work, traveling from cathode to plate whilst gettin', shall we say, influenced by the grid.

    The thing is, anything that is floatin' around within the tube can interact with the electron stream(s) in the tube and slow the electrons down and/or knock 'em off course. The getter's job is to get rid of as much of that flotsam (or is it jetsam?) as possible. At the very high vacuum levels inside of a tube, things that we don't normally think of as volatile are volatile! Thus the persistent need for the getter throughout the life of the tube.

    We are used to seeing so-called "flashed getters" in many tubes. This is that silvery coating, somewhere on the glass, of barium metal that's deposited (evaporated) onto the glass during the manufacturing process. The flashed getters are useful 'vacuum indicators' -- if air gets into a tube, the silvery looking barium is converted to powdery white barium oxide (and the tube's kaput). :(

    I don't know if the saucer in the Rooskie tube is the getter, or if it held the getter material during manufacture. My guess is the former, as the tube(s) in the pictures above don't seem to have a flashed getter(?).


    stuff about getters.
    http://www.tubebooks.org/file_downloads/Getter_Material.pdf


    wv92ijy4aatk.jpeg


  • mhardy6647
    mhardy6647 Posts: 33,345
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    ol' Marky the Inexcusably Slothlike finally made the trek all the way down the cellar stairs to check the plinker graveyard.

    Here's one I would offer up* if the OP'd like it. A used Sylvania 6SN7GTB. A tall drink o' water, as my father would've said. Checks good for emissions, grid leakage and shorts (i.e., no grid leakage nor shorts!) on my hand-me-down Mighty-Mite III :) (no more, and no less, than a simple but dependable emissions-type tester)

    I will use test it anon & send a PM to the OP -- but I wanted to share a coupla photos for... posterity. :|


    24506449367_eaaa1ca0c1_b.jpgDSC_0217 (2) by Mark Hardy, on Flickr
    24506449997_61c8c26ac9_b.jpgDSC_0214 (2) by Mark Hardy, on Flickr
    38493318555_6db8f6b48c_b.jpgDSC_0213 (2) by Mark Hardy, on Flickr
  • Viking64
    Viking64 Posts: 6,836
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    mhardy6647 wrote: »
    I will use test it anon & send a PM to the OP -- but I wanted to share a coupla photos for... posterity. :|

    Wow! She's a beauty. :p

    https://www.youtube.com/watch?v=mQ_k_VG6Syc
  • Clipdat
    Clipdat Posts: 12,773
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    Oh hell yes. Excitement level rising!

    PMing you :)
  • Clipdat
    Clipdat Posts: 12,773
    edited January 2018
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    Few pics of the tubes that have been generously given to me for free by fellow Polkies.

    First up is a pair of Silvertone tubes from @voltz . Love the writing on the base: "We guarantee this tube to give perfect satisfaction for one year. Sears Roebuck and Co."
    bx3r3h4zjakt.jpg
    1mv67t04c3cp.jpg
    tdwurifq8muq.jpg


    Next up is a Sylvania tube from @mhardy6647 - look at how much taller it is than the Silvertones! Also, you can see that the tube part leaves the base at an angle. It's slightly crooked, which gives it immense character and uniqueness. :wink:
    jur4t44kg6a5.jpg
    c3ng776k0qhb.jpg


    Thanks to both of you, I really owe you guys one!
  • mhardy6647
    mhardy6647 Posts: 33,345
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    You are welcome (of course) :)
    Have fun!
  • verb
    verb Posts: 10,176
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    Thanks Ivan for sharing this thread! Now that the Cary appears to be back in business, time to get my read on and travel down the 6SN7 path, as many of you have done before! :smile:
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  • mhardy6647
    mhardy6647 Posts: 33,345
    edited October 2019
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    The wonderful thing about 6SN7s is that there were zillions of them produced. I picked up a box of plinker tubes (pulls) from the freebie pile at NEARC last week. Along with some of the usual suspects*, there were three or four nice looking 6SN7s. Haven't tested them yet, but I woudn't be surprised if they're all good.

    _______________
    * e.g., 1B3 HV rectifiers from old monochrome CRT TVs of a long-gone era. Heck, even I can muster the gumption to throw those away! :*
  • verb
    verb Posts: 10,176
    edited October 2019
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    mhardy6647 wrote: »
    The wonderful thing about 6SN7s is that there were zillions of them produced. I picked up a box of plinker tubes (pulls) from the freebie pile at NEARC last week. Along with some of the usual suspects*, there were three or four nice looking 6SN7s. Haven't tested them yet, but I woudn't be surprised if they're all good.

    _______________
    * e.g., 1B3 HV rectifiers from old monochrome CRT TVs of a long-gone era. Heck, even I can muster the gumption to throw those away! :*

    So Doc, been getting some reading on the 6SN7 history, tube testers, and I'm struggling with the difference between "true" vs. "dynamic" transconductance. Help a newbie out please! :)
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    Spare Room: Dayens Ampino Integrated Amp, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's, Shunyata Hydra 8 Power Conditioner
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  • GlennDog
    GlennDog Posts: 3,110
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    I think the good doctor is gonna blow up your inbox with reams of info!🤣🤣🤣🤣🤣
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  • mhardy6647
    mhardy6647 Posts: 33,345
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    I... I actually don't know the answer to his question :(

  • verb
    verb Posts: 10,176
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    Hey Mark, found this snippet in one of the technical articles linked below.

    hxova6xzvwa6.png

    http://www.alltubetesters.com/articles/tester_guide.htm
    Basement: Polk SDA SRS 1.2tl's, Cary SLP-05 Pre with ultimate upgrade,McIntosh MCD301 CD/SACD player, Northstar Designs Excelsio DAC, Cambridge 851N streamer, McIntosh MC300 Amp, Silnote Morpheus Ref2, Series2 Digital Cables, Silnote Morpheus Ref2 Series2 XLR's, Furman 15PFi Power Conditioner, Pangea Power Cables, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
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    Spare Room: Dayens Ampino Integrated Amp, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's, Shunyata Hydra 8 Power Conditioner
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  • mhardy6647
    mhardy6647 Posts: 33,345
    edited October 2019
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    :) That snippet enters territory I am more familiar with.
    I do agree with the author, though -- Hickok or the highway :)

    You should get a refurbished and properly calibrated Hickok if you want to test tubes under 'actual' operating conditions (i.e., to match sections in twin triodes or to match pairs or quads of power tubes). They are not inexpensive, but buying a cheap Hickok is like buying a cheap used Mercedes ;)

    It's even better, I'd opine, to know someone with a good Hickok (like a TV-7). :)

    The best test of a tube is to try it in the circuit in which you would like to use it! :)

    I have a simple but battle-tested 'emission type' tester (Sencore Mighty Mite III, in my case). Useless for tube matching, but a reliable way to test the 'strength' of electron emission from the cathode. The Mighty Mites also feature a very good grid leakage test, plus a good test to detect shorted internal elements in a tube. This is a good 'first pass' test for plinkers (e.g., used/"pull"/foundling tubes) to protect a piece of expensive equipment from injury :|
    These were mostly for the TV service market and lack sockets for early tubes (4, 5, 6, and 7 pin sockets for the old globe and "ST"/Coke Bottle shaped tubes prior to the octal/miniature base era) -- i.e., no 2A3 testin' with a stock Mighty Mite :/

    38493318555_6db8f6b48c_b.jpgDSC_0213 (2) by Mark Hardy, on Flickr

    This one was my father's :)

    The drug store tube testers were emissions testers and, first and foremost, were designed to sell tubes (if you catch my drift :p ).




  • verb
    verb Posts: 10,176
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    I remember going to the drugstore with my Dad with a shoebox full of TV tubes! Good memories! :)
    Basement: Polk SDA SRS 1.2tl's, Cary SLP-05 Pre with ultimate upgrade,McIntosh MCD301 CD/SACD player, Northstar Designs Excelsio DAC, Cambridge 851N streamer, McIntosh MC300 Amp, Silnote Morpheus Ref2, Series2 Digital Cables, Silnote Morpheus Ref2 Series2 XLR's, Furman 15PFi Power Conditioner, Pangea Power Cables, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
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    Spare Room: Dayens Ampino Integrated Amp, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's, Shunyata Hydra 8 Power Conditioner
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  • verb
    verb Posts: 10,176
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    The TV-7 was my conclusion as well. According to what I've read, you take the reading and use the included chart (blue booklet) to covert to Gm.
    mgi223joxsdc.png
    Basement: Polk SDA SRS 1.2tl's, Cary SLP-05 Pre with ultimate upgrade,McIntosh MCD301 CD/SACD player, Northstar Designs Excelsio DAC, Cambridge 851N streamer, McIntosh MC300 Amp, Silnote Morpheus Ref2, Series2 Digital Cables, Silnote Morpheus Ref2 Series2 XLR's, Furman 15PFi Power Conditioner, Pangea Power Cables, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, Northstar Designs Intenso DAC, Antique Sound Labs AV8 Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: Dayens Ampino Integrated Amp, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's, Shunyata Hydra 8 Power Conditioner
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Rotel RCD-1072 CD player, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
    Garage #1: Cambridge Audio 640A Integrated Amp, Project Box-E BT Streamer, Polk Tsi200 Bookies, Douglas Speaker Cables, Shunyata Power Conditioner
    Garage #2: Cambridge Audio EVO150 Integrated Amplifier, Polk L200's, Analysis Plus Silver Oval 2 Speaker Cables, IC's TBD.
  • verb
    verb Posts: 10,176
    edited October 2019
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    Another side note, I contacted my local vintage radio service store, of which they have done very good work for me in the past, including troubleshooting the VTL a while back, but was dismayed to discover the details of their tube checking service.

    They charge $1/tube (reasonable) but only check to see if the tube is good or bad! They have many testers, including a Hickock (534 IIRC), but would not record the actual Gm values for me. WTH?!

    I haggled with the guy for a bit, and got him to agree if I provided a table on a sheet of paper with the advertised Gm results, or NOS values, they would fill out the blank field in the table of the actual values!

    I guess tube checking is not in their business model. Needless to say I was a little soured and dismayed. :confounded:
    Basement: Polk SDA SRS 1.2tl's, Cary SLP-05 Pre with ultimate upgrade,McIntosh MCD301 CD/SACD player, Northstar Designs Excelsio DAC, Cambridge 851N streamer, McIntosh MC300 Amp, Silnote Morpheus Ref2, Series2 Digital Cables, Silnote Morpheus Ref2 Series2 XLR's, Furman 15PFi Power Conditioner, Pangea Power Cables, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, Northstar Designs Intenso DAC, Antique Sound Labs AV8 Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: Dayens Ampino Integrated Amp, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's, Shunyata Hydra 8 Power Conditioner
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Rotel RCD-1072 CD player, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
    Garage #1: Cambridge Audio 640A Integrated Amp, Project Box-E BT Streamer, Polk Tsi200 Bookies, Douglas Speaker Cables, Shunyata Power Conditioner
    Garage #2: Cambridge Audio EVO150 Integrated Amplifier, Polk L200's, Analysis Plus Silver Oval 2 Speaker Cables, IC's TBD.
  • verb
    verb Posts: 10,176
    edited October 2019
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    These came today! :)

    Set of 4 NOS Sylvania's. According to some tutelage from one of our very own and subject matter expert @pitdogg2 these are 1958 (December) vintage, IIRC and was paying attention to his teaching! :)
    8svp6et6sr7p.png
    Basement: Polk SDA SRS 1.2tl's, Cary SLP-05 Pre with ultimate upgrade,McIntosh MCD301 CD/SACD player, Northstar Designs Excelsio DAC, Cambridge 851N streamer, McIntosh MC300 Amp, Silnote Morpheus Ref2, Series2 Digital Cables, Silnote Morpheus Ref2 Series2 XLR's, Furman 15PFi Power Conditioner, Pangea Power Cables, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, Northstar Designs Intenso DAC, Antique Sound Labs AV8 Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: Dayens Ampino Integrated Amp, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's, Shunyata Hydra 8 Power Conditioner
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Rotel RCD-1072 CD player, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
    Garage #1: Cambridge Audio 640A Integrated Amp, Project Box-E BT Streamer, Polk Tsi200 Bookies, Douglas Speaker Cables, Shunyata Power Conditioner
    Garage #2: Cambridge Audio EVO150 Integrated Amplifier, Polk L200's, Analysis Plus Silver Oval 2 Speaker Cables, IC's TBD.
  • verb
    verb Posts: 10,176
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    And, how could I resist! From my own company! Of a different era, of course! :)
    v4n7pvbek1r4.png
    Good view of the side mounted getter. Is the this the infamous "D" getter?
    1t6k7lzm83e9.png
    Funny @pitdogg2 as you mentioned, even the package is labled "GE" :)
    Basement: Polk SDA SRS 1.2tl's, Cary SLP-05 Pre with ultimate upgrade,McIntosh MCD301 CD/SACD player, Northstar Designs Excelsio DAC, Cambridge 851N streamer, McIntosh MC300 Amp, Silnote Morpheus Ref2, Series2 Digital Cables, Silnote Morpheus Ref2 Series2 XLR's, Furman 15PFi Power Conditioner, Pangea Power Cables, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
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    Spare Room: Dayens Ampino Integrated Amp, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's, Shunyata Hydra 8 Power Conditioner
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Rotel RCD-1072 CD player, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
    Garage #1: Cambridge Audio 640A Integrated Amp, Project Box-E BT Streamer, Polk Tsi200 Bookies, Douglas Speaker Cables, Shunyata Power Conditioner
    Garage #2: Cambridge Audio EVO150 Integrated Amplifier, Polk L200's, Analysis Plus Silver Oval 2 Speaker Cables, IC's TBD.
  • verb
    verb Posts: 10,176
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    Here's a good pic of a GE tube with the same getter. Construction appears to be identical.
    p0qx9cz8ialw.png
    Basement: Polk SDA SRS 1.2tl's, Cary SLP-05 Pre with ultimate upgrade,McIntosh MCD301 CD/SACD player, Northstar Designs Excelsio DAC, Cambridge 851N streamer, McIntosh MC300 Amp, Silnote Morpheus Ref2, Series2 Digital Cables, Silnote Morpheus Ref2 Series2 XLR's, Furman 15PFi Power Conditioner, Pangea Power Cables, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, Northstar Designs Intenso DAC, Antique Sound Labs AV8 Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: Dayens Ampino Integrated Amp, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's, Shunyata Hydra 8 Power Conditioner
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Rotel RCD-1072 CD player, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
    Garage #1: Cambridge Audio 640A Integrated Amp, Project Box-E BT Streamer, Polk Tsi200 Bookies, Douglas Speaker Cables, Shunyata Power Conditioner
    Garage #2: Cambridge Audio EVO150 Integrated Amplifier, Polk L200's, Analysis Plus Silver Oval 2 Speaker Cables, IC's TBD.
  • pitdogg2
    pitdogg2 Posts: 24,919
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    I get a lucky guess from time to time :D I cannot get a good look at the getter. Some were round and some were horse shoe. Some were clipped around the plate edge.

    1958 was my best guess due to the boxed label on the Sylvania tubes. Earlier tubes also had the chrome almost half way down the tube and some almost 3/4 down one side. Those are good tubes either way. Later tubes were made by Philips and had blue writing most of those are in the 1970's era
  • pitdogg2
    pitdogg2 Posts: 24,919
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    More research has led to those are 1968 not 1958.
    I fouled that one. Sorry Dave.
    Sylvania started using yellow writing in the 60's and the last number of the year instead of the last two digits.
    My early 50's up to 58 i have are green lettering and much more chrome. So much that you are not able to see the top of the plate or getter. They also say 5835 and 5214 as codes. They also have wider bases than those.
    Strange my phone I can actually see that getter better than my laptop. That is a horseshoe getter.