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50 triode amp
50 triode amp
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Old 17th September 2019, 12:30 PM   #41
disco is offline disco  Netherlands
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Thanks, again. How about this 10KHz square, 28KHz not too low? Seems to clear up the midrange and cymbals sound more natural.
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File Type: jpg 56pF100K.jpg (130.4 KB, 78 views)
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Old 17th September 2019, 03:55 PM   #42
jhstewart9 is offline jhstewart9  Canada
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Final scope image is of 30Hz with the 8Ω loudspeaker connected. I can't explain for the slope but proably it's common for a SE amplifier.



The poor response to the 30 Hz square wave might be due to the interstage transformer. Put the scope on the 300B grid, that will tell you.
Nice Philips Scope, used to be lots of them here in the 60s & 70s, especially at the schools. They were competitive to the lower cost lines offered by TEK & HP.
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Old 17th September 2019, 07:49 PM   #43
disco is offline disco  Netherlands
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Will investigate tomorrow. Yes, Philips was competitive in those days. It invented ways to arrive at noval products at lower prices. Lot of plastics involved unfortunately

I keep coming back to that decoupling to signal ground as it's much more agreable in comparison to a big electrolyte. Will have to build me a 1KV PS soon
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Old 18th September 2019, 03:45 PM   #44
disco is offline disco  Netherlands
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Quote:
Originally Posted by jhstewart9 View Post
The poor response to the 30 Hz square wave might be due to the interstage transformer. Put the scope on the 300B grid, that will tell you.
Some sagging after the interstage but no deformation (left pic). Resistive load to the OPT (second pic) and 8R speaker (right pic). Deformation has strong dependence with output level.
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File Type: jpg 30Hz - interstage.jpg (109.0 KB, 26 views)
File Type: jpg 30Hz - resistive.jpg (40.9 KB, 19 views)
File Type: jpg 30Hz - loudspeaker.jpg (51.9 KB, 2 views)
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