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Old 2nd November 2005, 06:13 PM   #1
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Default Distortion in Fisher 800C

Hello

I have a 1964 Fisher 800C stereo and I have noticed that it sounds
good at low volumes with the Loudness on but if I turn it up past about 4
(loud off, bass and treble flat) I get pretty severe distortion.
This amp is connected to fairly decent Energy loudspeakers through the 8Ω
connection.
The amp puts out 30 Watts RMS per side and the speakers are rated for at least 100 Watts.
CD player through Aux input.
All of the tubes in the audio path have been replaced with Audio Harmonix
(Junk, I know) and DC bias levels etc. are OK.
Is this distortion normal at these levels?
I thought I should be able to crank it up pretty much all the way without
getting distortion.
Am I living in a dream world?????
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Old 2nd November 2005, 07:57 PM   #2
SY is offline SY  United States
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Two things:

Separate the concept of "gain" from "power."

Separate the concept of "power handling capacity" from "sensitivity."

Let's do a car analogy. Car A and car B both have the same engine, gearing, and weight. Car A's accelerator is set up so that the throttle is wide open when you push the pedal all the way to the floor. Car B's accelerator is set up so that the throttle is wide open when the pedal is only halfway to the floor. Which is more "powerful"? Clearly, neither. Which will put out more power when the pedal is pressed, say, 1 cm? Car B. Which will put out more power when the pedal is floored? They'll be the same.


OK, now car C and car D have the same engine and gearing. Car A weights 1000kg, car B weighs 500kg. Which car is more powerful? They're the same. Which will go faster at a given engine output? Clearly, car D.
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