Home Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

[ Follow Ups ] Thread: [ Display  All  Email ] [ Tube DIY Asylum ]
[ Alert Moderator ] [ Edit ] [ Delete ]

Here are the pics

67.1.105.7






New Page 1

Hi,


Here are the pics.  The first is of the secondary unloaded, ie just
hooked to the grids of the 6SN7.  By the way, all pictures were taken with
the amp actually running and using a 1x probe on one end of the secondary of the
input transformer only, that is I did not look at both ends.  Any comments
on problems with the measuring setup are welcomed.  Also, if you want any
other conditions I will give them a try if I have the stuff to do it.  Nice
symmetry in the ringing is about all I can say about the unloaded condition.



Below is 94k from end to end, ie not connected to the CT.



This is 47k from each end to the CT.  It's a little hard to tell from
the picture, but the overshoot and the undershoot both decreased a little and
the strange jump up it takes right at the end of the wave is less compared to
the picture above.



This is 23.5k from each end to the CT.  Rise time seems to have gone up
but overshoot is damped and undershoot is gone.



Taking a break from pictures and measuring and giving it a listen with the
23.5k setup.  Can't say I hear much difference yet, just might be a little
duller sounding.  Will have to pay more attention in a bit.


By the way, found the cause of the extra distortion.  Had hooked the cap
from the CT of the OPT to the star ground instead of to the high side of the
cathode resistor on the 12B4s.


 


Michael.



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

Follow Ups Full Thread
Follow Ups
You can not post to an archived thread.

[ Top 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 ]