Tubes Asylum

• Credit should be given to the person responsible for video - johnmil 05:46:49 10/15/14 (0)
  In Reply to: RE: Those of you that need 7199s,make life easy for yourself. posted by Michael Samra on October 10, 2014 at 20:29:35

  Look for ElPaso Tube Amps on you tube. You will find many interesting,
  informative videos by this fellow.
  
  Thanks for the link Mikey, I had not seen this one.
  
  Regards to all,
  John
  

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• Easy, Yes but . . . - FlaCharlie 07:33:49 10/14/14 (0)
  In Reply to: RE: Those of you that need 7199s,make life easy for yourself. posted by Michael Samra on October 10, 2014 at 20:29:35

  The adaptors are a good quick/easy solution and a pretty good deal since they come with tubes.
  
  But you might have a problem with the additional height in some cases, like the Sherwood S-5000, which has a pretty low profile. They may fit, but it will probably be a tight fit. Or, even if you have an open chassis, maybe you just don't like the way they look sticking out above the other tubes on the chassis.
  
  The big advantage of the adaptors is that you can switch back to 7199s if you like. If you simply want to use cheaper, more available, tubes (that apparently measure essentially the same as the 7199) you could save your $35 and simply rewire the sockets. Only three wires need to be changed:
  
  7199 ---> 6GH8 (or 6U8, 6BL8, 6EA8, 6KD8 - all have same pinout)
  Pin 2 ---> Pin 6
  Pin 6 ---> Pin 7
  Pin 7 ---> Pin 2
  
  . . . Charlie
  
  

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• so which would you recommend... - gkargreen 14:53:32 10/13/14 (6)
  In Reply to: RE: Those of you that need 7199s,make life easy for yourself. posted by Michael Samra on October 10, 2014 at 20:29:35

  the 6U8, the 6GH8, or the 6BL8? I note that the 6BL8 is pretty common as Amperex-made...
  

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  • RE: so which would you recommend... - sony6060 18:30:33 10/13/14 (4)
    In Reply to: RE: so which would you recommend... posted by gkargreen on October 13, 2014 at 14:53:32

    I use Amperex 6BL8 in the Fisher TA receiver series. The 6BL8 works well at the low plate voltage circuit in those Fishers.
    

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    • RE: so which would you recommend... - gkargreen 19:09:25 10/13/14 (3)
      In Reply to: RE: so which would you recommend... posted by sony6060 on October 13, 2014 at 18:30:33

      thanks, in what position is the 6BL8 used, and is it a replacement for the 7199?
      

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      • RE: so which would you recommend... - sony6060 19:21:11 10/13/14 (2)
        In Reply to: RE: so which would you recommend... posted by gkargreen on October 13, 2014 at 19:09:25

        The 6BL8 is the Fisher phase inverter tube that requires the adapter socket to replace the 7199. The pentode section is the amplifier section and the triode is the actual PI.
        
        7199s have a unique pin out and any substitute will require the socket adapter.
        
        What amp are you proposing the change? For example, in the Scott 340B I use a Mullard E80CF.
        

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        • RE: so which would you recommend... - gkargreen 20:11:19 10/13/14 (1)
          In Reply to: RE: so which would you recommend... posted by sony6060 on October 13, 2014 at 19:21:11

          a Sherwood S-5000 with the 7189 outputs...
          

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          • RE: so which would you recommend... - sony6060 07:33:05 10/14/14 (0)
            In Reply to: RE: so which would you recommend... posted by gkargreen on October 13, 2014 at 20:11:19

            Either fore-mentioned tube will perform. I have not rolled tubes in the Sherwood 5000.
            

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  • and would this (these be recommended for use in a ... - gkargreen 15:01:42 10/13/14 (0)
    In Reply to: RE: so which would you recommend... posted by gkargreen on October 13, 2014 at 14:53:32

    Sherwood S-5000 (EL-84 type)?
    

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• RE: Those of you that need 7199s,make life easy for yourself. - sony6060 13:23:35 10/12/14 (0)
  In Reply to: RE: Those of you that need 7199s,make life easy for yourself. posted by Michael Samra on October 10, 2014 at 20:29:35

  I could not agree more about the adapters. Every rebuild I perform gets the adapters as better sounding tubes are available vs a 7199. I use 6BL8 and others vs the 6GH8 too.
  

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  Edits: 10/12/14
• RE: Those of you that need 7199s,make life easy for yourself. - JSTRM 12:34:14 10/12/14 (0)
  In Reply to: RE: Those of you that need 7199s,make life easy for yourself. posted by Michael Samra on October 10, 2014 at 20:29:35

  Thanks Mike...that was a nice video!
  Good info.
  
  jstrm
  

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• RE: Those of you that need 7199s,make life easy for yourself. - paul cbc 12:50:20 10/11/14 (2)
  In Reply to: RE: Those of you that need 7199s,make life easy for yourself. posted by Michael Samra on October 10, 2014 at 20:29:35

  Thanks Mike!
  Any recommendation on 6GH8A tube brands to pick up as spares?
  
  Paul
  

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  • RE: Those of you that need 7199s,make life easy for yourself. - Michael Samra 17:31:15 10/11/14 (1)
    In Reply to: RE: Those of you that need 7199s,make life easy for yourself. posted by paul cbc on October 11, 2014 at 12:50:20

    I like the Sylvania and next the GE..You can get them under the Zenith name as well which are made by Sylvania..RCA has a decent 6GH8A as well and you can also use 6U8s.
    "
    
    

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    • Thanks! Much Appreciated!!/nt - paul cbc 19:33:10 10/11/14 (0)
      In Reply to: RE: Those of you that need 7199s,make life easy for yourself. posted by Michael Samra on October 11, 2014 at 17:31:15

      Nt
      

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