Posted by Cut-Throat (A) on June 11, 2003 at 20:28:24

Is a 274b a drop in replacement for the GZ37 in the Moondogs?

What are the drop in replacements for the Moondogs other than the GZ37?

Thanks

Cut-Throat

• 274b's - anode that 12:33:23 06/13/03 (3)
  In Reply to: Rectifier Tubes for Moondogs? posted by Cut-Throat on June 11, 2003 at 20:28:24:

  I have been using the Sophia 274b non-mesh in mine for over 8 months with no mods and no problems, they replaced mullard gz-37's, 5ar4's, 5u4g's and just about every other type of rectifier I could try. You will not believe the difference. More open, better extension top and bottom with better bass control and tonality. I believe the mesh 274b's run at a different operating point???? if you end up trying them let me know how they work out. good luck
  
  

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  • Re: 274b's - Ron W 08:10:57 06/14/03 (0)
    In Reply to: 274b's posted by anode that on June 13, 2003 at 12:33:23:

    Most 274s have a 4A filament requirement. The Moondog's filament tap is rated at 3A so I could not recommend that you use this tube.

    Ron
    
    

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  • Re: 274b's - Cut-Throat 15:16:22 06/13/03 (1)
    In Reply to: 274b's posted by anode that on June 13, 2003 at 12:33:23:

    I was looking at the TJ Meshplates 274b's. Am I right that sell for around $170 a piece? - How about the solid plates?

    Thanks
    
    
    
    

    Cut-Throat
    

    
    
    
    
    

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    • Re: 274b's - ano 23:01:41 06/19/03 (0)
      In Reply to: Re: 274b's posted by Cut-Throat on June 13, 2003 at 15:16:22:

      I don't remember the exact price I paid for the solid plates, just that it was considerably cheaper than the projected price(at the time) than the mesh plates. I have been using AVVT Mesh 2a3's for the last year and a half and it sounds amazing. Several people have said use of the 274b may/will shorten tube life in comparison to a gz37, as of right now I think the sound is worth it if such is the case. YMMV.
      
      

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• Re: Rectifier Tubes for Moondogs? - riki 02:38:02 06/12/03 (0)
  In Reply to: Rectifier Tubes for Moondogs? posted by Cut-Throat on June 11, 2003 at 20:28:24:

  Kevin:

  I sent you an email on this....not sure if you got it though. You can also use a GZ34 or 5AR4 with good results. I also used a 5Y3 for a bit. You will find that B+ can go up or down a bit depending on tube, but nothing to make a really big difference. I adjusted the value of the small power risistors in the input/driver stage when using the 5Y3, but it wouldn't hurt to try without that.

  I honestly don't spend very much time tube rolling anymore, especially with rectifiers. I'm just lazy, I guess! :)

  Erik

  ...any luck with that soldering situation?
  
  

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