• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Tim De Paravicini's HiFi World 6080 amp modded by me.

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#81
Dangerously large grid resistor for four valves run hot and heavy. Inadequate B+ voltage for driver section. Scary combination of long loop feedback and no deliberate HF dominant pole. Lots of similarities, but with added bonus of stacked LF RC poles, tiny output valve cathode bypass caps, output valves at 130% of dissipation rating, and a questionable claimed power output. What's not to like?


YOS,
Chris
 
#83
Chris Hornbeck said:
Dangerously large grid resistor for four valves run hot and heavy. Inadequate B+ voltage for driver section. Scary combination of long loop feedback and no deliberate HF dominant pole. Lots of similarities, but with added bonus of stacked LF RC poles, tiny output valve cathode bypass caps, output valves at 130% of dissipation rating, and a questionable claimed power output. What's not to like?


YOS,
Chris
Click to expand...

agree on the plate dissipation ratings, a 6528 would be a better choice here..
a simple aikido front end would have been better without the need for global feddback...my take..
 
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