Bottlehead Forum
Bottlehead Kits => Eros Tape => Topic started by: ALEXZ on April 27, 2012, 03:37:58 PM
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Here is a distortion spectrum. Signal is 1kHz at 30(!)v RMS output, just before clipping. Pure 2nd harmonic, about -32dB. Pretty much the same goes all over audio frequencies. At 3v RMS output distortions goes at about -54dB. Below that i can only measure distortions of my (not too good) generator, 60/120 Hz etc.
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Alex,
Very cool picture! 30V RMS output is also very impressive.
How did you get the signal? Are you using a signal generator and an inverse RIAA?
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Hi Grainger,
Here is the setup : genarator direct to eros input . Eros output goes to distortion meter (basicaly voltmeter with Wien bridge filter). Scope is taking signal after the Wien bridge, fundamental is filtered out, highpass filter removes 60hz buzz . Whater leftovers are distortions. Unfortunatly i cant measure Eros's distortion with normal level of signa, my generator itself has about -56dB distortions and, becouse it SS generator with amplifier, harmonic spectrum looks absolutly awful. Re-phrasing John Updike : "solid state, is it a mistake or its done to us in purpose ?"
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Nice setup of test equipment. My signal generator is more a show piece, an old military tube type signal generator. One big dial on the front and lots of switches. It did work when I got it but I bought it bacause it looked so cool and was very cheap.
IIRC the first transistor was a Bell Labs mistake.
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You know, working in IT, using Internet etc. and complaining about SS maybe is not right. Lets change in to " solid state in audio signal path ... Is a mistake"