The Amp Garage

A small panoramic road

A group of abandoned houses

Hi Fisherman,
I hope you glad to see a few italian panoramas:

Hi,
please read this, you'll understand better my pdf.

Hi all,
28yo, italian mechanical engineer, my name is obviously Roberto. Started playing bass and guitar when I was just 17. Interested in searching an astonishing guitar sound, more than finding it. Just like an Ulysses in a sea of harmonics.

Rk' is cathode resistance of 12ax7 due to plate load.
The combination of that internal resistance and cathode resistor Rk (seen as a parallel) and cathode bypass cap Ck, changes low frequency cut-off of that stage. Ck in uF, Rk in kOhm and F in Hz.

Hi all,
I noticed someone attached cathode bypass roll-offs.
Time ago I wrote a xls about that. This is a print-friendly pdf version of it.
Enjoy!

Thanks David.
My interest is focused on a claim I've found on an Aiken's pdf:
bypass caps are often used to compensate high series resitance frequency roll-off. So.. if I lower triodes load.. ..and also thermal noise should.. Am I wrong?

Hi all, I'm interested about the real frequency shaping until the second OD triode. Slo100 just because it has the most complete and complex coupling stage in universally known schematics. - due to Rk//Ck: 145Hz Shelving Filter (SH) between Unbypassed 47x gain and bypassed 77x gain. the the cut-off ...