tube/valve tech help

Discussion in 'Glowing Bottle Tube Amp Forum' started by 24 track, Oct 27, 2018.

  1. 24 track

    24 track Doctor of Teleocity Silver Supporter

    Posts:
    15,322
    Joined:
    Nov 6, 2014
    Location:
    kamloops bc
    I got a ton of tubes out of a Hammond -3 chord organ

    some of the tubes I know like the
    Sylvania 6V6 GT Black bottles power tubes
    RCA 5U4 GB rectifier
    and I have a use for

    But Im not familiar with the
    Rodgers 6SK7 ( look like rectifier cans)
    RCA 6SC7

    and the 6SN7
    RCA,Marconi,Sylvania



    what are these tubes, and what would be their usage
    I do know these are 6 volt and thats about it. are they like a 6 voly version of a 12AX7 , preamp tube?

    I dont plan to build any thing with them, but more of a fact finding, thing

    any help is great, thanks ......24
     
    Last edited: Oct 27, 2018
  2. awasson

    awasson Poster Extraordinaire Gold Supporter

    Age:
    56
    Posts:
    5,408
    Joined:
    Nov 18, 2010
    Location:
    Vancouver
    Well the 5U4 are rectifiers.

    The 65K7 are a pentode. I’m not at all familiar with them but I may have a data book with them listed. I’ll have a look this weekend if nobody else chimes in.

    6SN7 are a dual triode. Like a 12AX7 but octal rather than miniature 9 pin. I’ve got some of those in a HI Fi amp circuit. Sweet sounding driver tube.

    It’ll be intersting to see what those Pentodes are all about. I suppose they’re output tubes but without seeing the data on them it’s hard to say.

    EDIT: Are you sure those aren’t 6SK7 tubes? I’m doing some internetting and that seems a more likely designation.
     
    24 track likes this.
  3. 24 track

    24 track Doctor of Teleocity Silver Supporter

    Posts:
    15,322
    Joined:
    Nov 6, 2014
    Location:
    kamloops bc
    thanks for getting back to me

    I knew the 5U4 was arectifier tube

    you are correct the RCA is a 6SC7 (R) and the 2 ROGERS are 6SK7 (L) (my eyes are getting worse by the day ) as you see they look like rectifier cans,.I've never worked with these before

    sorry for the pissy pics but I couldneget decent lighting for these tonight

    P1012069_2.JPG
     
  4. awasson

    awasson Poster Extraordinaire Gold Supporter

    Age:
    56
    Posts:
    5,408
    Joined:
    Nov 18, 2010
    Location:
    Vancouver
    I’ll have to look in the tube data books I got from my dad.

    The 6SC7 appears to be a dual triode with a common cathode. Lots of diagrams of it on the internet but a real tube data book would have more useful info.

    The 6SK7 appears to be a pentode but it seems that it was designed as an RF tube. I’ll see if I can find any info in the manuals on this one as well.
     
    24 track likes this.
  5. 24 track

    24 track Doctor of Teleocity Silver Supporter

    Posts:
    15,322
    Joined:
    Nov 6, 2014
    Location:
    kamloops bc
    excellant , thank you!
     
  6. Wally

    Wally Telefied Ad Free Member

    Posts:
    35,248
    Joined:
    Mar 17, 2003
    Location:
    Lubbock, TX
    Good site....

    Duncan Tube Datasheet Locator
     
    24 track likes this.
  7. DCW74

    DCW74 Tele-Meister

    Age:
    45
    Posts:
    113
    Joined:
    Sep 11, 2018
    Location:
    Columbus, OH
    I love the 6SN7. It's a medium Mu tube, but it is sweet.
     
    24 track likes this.
  8. 24 track

    24 track Doctor of Teleocity Silver Supporter

    Posts:
    15,322
    Joined:
    Nov 6, 2014
    Location:
    kamloops bc
    thank you I'll check it out!
     
    Wally likes this.
  9. Wally

    Wally Telefied Ad Free Member

    Posts:
    35,248
    Joined:
    Mar 17, 2003
    Location:
    Lubbock, TX
    The Fender tweeds from 1954 on back used octal preamp and phase inverter tubes...6SC7, 6SL7, and 6SN7....
    The 12AX7 was introduced in 1947, iirc, and it took a while for it and the other Noval subminiature to make their way into use in audio circuits. Iirc, the 5D circuits from Fender were the first to go with novals in about 1954. A look at the schematics is enlightening.... Schematic Heaven is a good resource...or EL34 World....for schematics.
     
    24 track likes this.
  10. 24 track

    24 track Doctor of Teleocity Silver Supporter

    Posts:
    15,322
    Joined:
    Nov 6, 2014
    Location:
    kamloops bc
    thanks Wally, I was curious what these were , I didnt have time to strip the the hammond they came from but I knew the tubes could be useful and they are all original stock american tubes and only 6 volt
    my big prize was the 6V6 black bottles, and the 5U4 the full circuit would have been fun to play with

    I will check out the sites you mentioned, cool
     
    Wally likes this.
  11. awasson

    awasson Poster Extraordinaire Gold Supporter

    Age:
    56
    Posts:
    5,408
    Joined:
    Nov 18, 2010
    Location:
    Vancouver
    Ok, I only have one tube data manual here. It's a 1968 RCA receiving tube manual so although it references the tubes we're looking for, it doesn't give us all the dirt. There are more books at my dad's and I'm slowly working through his estate. I actually had them in my hand a couple of days ago when I had an alarm installed in his house, so I know exactly where they are. I will run over there this week and grab them.

    Here's what I've got so far.

    Tube-Data-6SC7-_-6SK7-(1440).gif



    I've scanned a page from the one book I do have. They are amplifier tubes I've highlighted the data on the attached scan. I think with a little engineering one could priduce a sweet sounding amp using the 6SC7 as a driver. I'm still not sure about the 6SK7. I'm more than certain it could be used as an output but I'd want to breadboard it for a while with a scope to see what was actually going on with it. It's a Pentode but everything I've read leads me to believe it's an RF amplifier. Hopefully I can get some more info from my dad's other books.
     
    24 track likes this.
  12. 24 track

    24 track Doctor of Teleocity Silver Supporter

    Posts:
    15,322
    Joined:
    Nov 6, 2014
    Location:
    kamloops bc
    thank you guys very much, I some great stuff here
     
IMPORTANT: Treat everyone here with respect, no matter how difficult!
No sex, drug, political, religion or hate discussion permitted here.


  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.