T.amp pm40C

[drakano]

Hello everyone.

I will write in English because I don't know German.

First I read the thread about T.amp and his modification, but I have some questions.

I try to measure the FR of the amp, but I receive different curves from listed in http://www.visaton.de/vb/showthread....t=pm40c&page=3

What is my setup:


Steps setup:


Distortion:


The amp is in the original setup, I didn't replace C3 and C14.

My questions are:
- Is the measuring setup correct and STEPS is configured properly?
- The distortions looks similar to the other listed in the thread for pm40c but I'm not sure.
- I can't post the graphs of the FR because i reach the limit of attachments, but the FR looks different. I will post soon.

[Frankynstone]

Hi drakano,

seems like you want to use these 18k and 2k resistors as a voltage divider. Thus the 2k has to be connected to the other terminal of the 18k. How it works:

• output voltage of the amp is input voltage of the divider
• divider consists of two resistors in series, current is driven through 18k at first and then through 2k to ground
• current is input voltage divided by sum of resistors equals 20k
• output voltage is current multiplied by 2k
• output voltage is measured

I've never used STEPS, so I can't tell you about that.
If you want to attach more files, simply answer to your own posting

[drakano]

You are right, this is correct divider: