Tubes?

[z_p_e]

Yeah, I think BEP is correct.

Funny they didn't include an output decoupling cap 

[turbo]

yes, the two dots are the output terminals.

M.

[z_p_e]

Marco,

Have you yet had any success redoing your transformer/5U4GB experiment with the suggestions I made?

You also mentioned recently that you used a couple 100k pots and a 30k resistor. How exactly did you have these connected? And the capacitor value?

Darren

[z_p_e]

Marco,

I have done some analysis of your posted "kicks" wave form, and done a simulation with the circuit as well to get a rough idea of the capacitor you were using on your output.

First, I tried with a series 100k and shunt 30k resistor on the output, and found that a value of about 0.047uF put me in the ball park of what your waveform looks like, minus the kicks of course.

Secondly, look at your annotated wave form below. Analysis of it revealed that your plate sine generator could not have been 100 Hz, but was 50 Hz. Is this correct?

Remember that the rectified output will be twice the frequency of the input...so 100/2 = 50 Hz.

Darren

[turbo]

Darren,
i did not use a capacitor on the output i just connected as much resistance as i could find to protect the scope in series.
The first thing which caugt my eye was that the kick appears to be at the end of every top of the wave.
if it was really a output with two waves mixed, there should also be peaks between the wave toppings due to the diffrence in frequency's, but as you can see this was not the case.

i still need to reconnect the setup.

Marco.