Tom Kamphuys's Recent Activity

  1. Tom Kamphuys liked tubegeek's post in the thread Vintage Princeton Reverb volume fluctuations.

    @Paul G. and I are both pretty sure. So it must be something else.

    Jul 2, 2020 at 12:30 PM
  2. Tom Kamphuys replied to the thread Transformer and choke positioning.

    After testing some more, I have found that there is a minimum in the hum very close to the PT and choke. I only have to raise the OT...

    Jul 1, 2020 at 5:06 PM
  3. Tom Kamphuys replied to the thread Load line plotter for unbypassed gain stage.

    I was hoping I could use the new plate curves in the unbypassed case, just as we do the normal plate curves in the bypassed case.

    Jun 30, 2020 at 6:01 PM
  4. Tom Kamphuys replied to the thread Load line plotter for unbypassed gain stage.

    It is a learning experience. I can recreate the lines, so I'm now ready to use existing tools. I know spice exists. I have it installed...

    Jun 30, 2020 at 5:34 PM
  5. Tom Kamphuys attached a file to the thread Transformer and choke positioning.

    I've made a wooden dummy chassis and mounted some hardware. Good I did that as I had some mistakes in the drawings. I performed the...

    IMG_20200630_223112473.jpg Jun 30, 2020 at 4:57 PM
  6. Tom Kamphuys attached a file to the thread Load line plotter for unbypassed gain stage.

    I thought you were high on something, but I found out today that the image is from the 1945 book :D [ATTACH] Promising! I don't get...

    comp2.png Jun 30, 2020 at 11:55 AM
  7. Tom Kamphuys attached a file to the thread Load line plotter for unbypassed gain stage.

    Not complete wrong, not completely right: [ATTACH] It seems that the 'standard' grid curves are already different. @Ten Over Where...

    comp.png Jun 29, 2020 at 5:46 PM
  8. Tom Kamphuys replied to the thread Load line plotter for unbypassed gain stage.

    Too many little projects going on. Not given up, yet.

    Jun 29, 2020 at 3:39 PM
  9. Tom Kamphuys replied to the thread Unbalanced single ended, parallel output stage?.

    Actually, the plate resistors are mismatched to counteract the gain difference of the two sides of an LTP. Source: Blencowe, Section...

    Jun 29, 2020 at 11:12 AM
  10. Tom Kamphuys attached a file to the thread Screen dropping resistor wattage.

    Taken from https://www.aikenamps.com/index.php/technical-q-a [ATTACH]

    Screenshot_20200629-161640.png Jun 29, 2020 at 10:17 AM
  11. Tom Kamphuys attached a file to the thread JCM800 6V6 variant.

    I was just about to brag I did this so that didn't happen. Then this made itself abundantly clear: [ATTACH] Only two of the standoff...

    IMG_20200628_122341215.jpg Jun 28, 2020