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Odd's n Ends  Revisited 6V6 SE amp
Odd's n Ends  Revisited 6V6 SE amp
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Old 10th March 2006, 02:31 AM   #1
Sparky OR is offline Sparky OR  United States
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Default Odd's n Ends Revisited 6V6 SE amp

Anyone built the amp in 9/05 Audio Express by Graham Dicker. It is a 6V6 SE amp driven by a 12AX7 with potentiometers of 5k for the driver cathode and 1meg for the anode. I built it, because it seemed like a good way for a relative newbie to look at how these variables effect the sound. I used an old 5k SE OPT from a Curtis Mathis hi-fi. Sounds ok, and varying the cathode seemed to have lots more effect than varying the load. I used a cheapie Elenco function generator and an old Hewlett Packard scope to see the output results into an 8 ohm resistor. The amp did not have anything close to a square wave output an any freguency from 100 to 10khz. But when I added a feedback resistor of 6.8k bypassed by a 100pf cap I could get square wave out without too much "ringing?". Is square wave output indicative of anything relative? Or is it not worth chasing down?
Wish I'd studied this stuff with as much interest 30 years ago!
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Old 10th March 2006, 02:55 AM   #2
DigitalJunkie is offline DigitalJunkie  United States
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Square wave response is worth chasing down,it's great for tuning the feedback network,among other things.
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Old 10th March 2006, 07:54 AM   #3
Tubes4e4 is offline Tubes4e4  Germany
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Also, square waves are very useful to test and optimize stability at complex loads. And they come in handy to determin bandwidth (upper and lower -3dB points) fast and easy.

If in doubt, just measure.
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