• RE: 46 IT 46 - KevinC 18:24:37 03/21/16 (1)
  In Reply to: RE: 46 IT 46 posted by jdg123 on March 21, 2016 at 13:53:08

  There's nothing wrong with the proposition diagrammed above. With a 5K:8ohm output transformer, and two 46 gain stages, you will achieve a gain of about 8dB.
  
  Given the plate impedance of the tube (something like 2400ohms) you could get good results from either the Lundahl LL2753/25mA (1:1) or the shown Lundahl LL2746/30mA (1:2). The Lundahl LL1663/30mA (5K:8ohms) would be my choice for output transformer.
  
  With the output stage cathode resistor shown the IT secondary lead labeled "BIAS" will require a positive voltage applied or the output tube will be cut off. You could use a smaller value cathode resistor and then ground that secondary lead.
  
  Kevin Carter
  K&K Audio
  www.kandkaudio.com
  
  

  ---

  • RE: 46 IT 46 - jdg123 05:55:07 03/29/16 (0)
    In Reply to: RE: 46 IT 46 posted by KevinC on March 21, 2016 at 18:24:37

    
    
    

    
    Thank you very much for taking a look! I have taken your suggestion to heart. I already have a James 6123 output or I'd be looking to make the new amp all Lundahl. I have more to work out but I'll come back and post here when I have a proper build to report on. And I'll be needing the LL2746 for sure!
    
    
    

    ---

Post a Followup:

This post is made possible by the generous support of people like you and our sponsors:

Schiit Audio

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---