Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => AmpTools/Tech Tips => Topic started by: antieatingactivist on December 02, 2009, 10:48:59 pm

Title: Oscilloscope tips
Post by: antieatingactivist on December 02, 2009, 10:48:59 pm

Can anyone point me to a resource for using an oscilloscope on tube amps? I'm not really sure what things like parasitic oscillations, crossover distortion etc... look like.

Title: Re: Oscilloscope tips
Post by: tubesornothing on December 02, 2009, 11:50:13 pm

Aiken amps - crossover distortion:  http://aikenamps.com/CrossoverDistortion.htm

Here is a pic of what parasitic oscillation might look like.  I had to mock it up a bit, but it gives the right idea.

Title: Re: Oscilloscope tips
Post by: The_Gaz on December 03, 2009, 02:30:31 am

Quote

I had to mock it up a bit, but it gives the right idea.

Thanks the most adorable oscillation I've ever seen.

Tone Lizard http://tone-lizard.com/Oscilloscopes.htm (http://tone-lizard.com/Oscilloscopes.htm) has a good intro and some good links too.

Title: Re: Oscilloscope tips
Post by: Rosser on December 03, 2009, 09:28:16 am

Speaking of scopes, has anyone ever run a sine wave through their effects chain to see what they are doing to the waveform? Thought it might be interesting...

Title: Re: Oscilloscope tips
Post by: tubesornothing on December 03, 2009, 09:35:22 am

he he - the "shark fin" from above comes from an OCD