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In Reply to: RE: apologies ... posted by Alex Kitic on January 22, 2015 at 23:15:43
this rh84 measures better than the last el84 amp I built. I think I ended up around 2.2% distortion at 1 watt using el84 UL with edcor iron... 12at7 led biased... so alex, I Like your design! I think i'll switch my el84 amp to it and give it a listen.
Follow Ups:
I built a RH84 from a console amp I found next to the road with a FREE sign. I was driving my pickup so I stopped and took it home.
I have a scope, function generator, dvm. Can I measure distortion with only these instruments? I'm more curious than anything.
The amp works great for what I'm using it for. Sorry for the lousy pic.
looking for some jazz and a little libations - joe strummer
Sure a scope can tell you lots, you will be able to visually see distortions. IMO for us amateurs a visual representation is more useful then a static number.Anyhow I won't spend a lot of time on it in this thread, but make sure your scope and DVM can be used at those voltages and don't float the ground.
You should find a suitable power resistor for your OPT. 8Ohm? high wattage.
Have a look at the link, it shows you what phase and symmetry and 10% harmonic distortions look like.
Farther down it shows what noise, parasitic oscillation, clipping and reservoir capacitor ripple look like.It also has a nice section on square wave testing, shows you what the altered squares mean. Also shows the effect of differentiator and integrator (tone controls) circuits.
Take your time, maybe google around a bit, check out youtube this will give you a better feel for what you might be comfortable testing.
Edits: 01/23/15
Thanks. I do have a 50w dale power resistors and heat sinks I use for a loads.
looking for some jazz and a little libations - joe strummer
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