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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: No, this beauty was NOT for mass consumers market. posted by cheap-Jack on February 17, 2006 at 14:41:35:
Back in the days when I used to repair this stuff for a living, this is the kind of circuit we'd see over and over in big consoles and cheap record player systems- the 1960s equivalent of rack stuff. Poor distortion, noise, and overload performance, ridiculous load sensitivity, poor RIAA conformance, poor stability of RIAA with tube aging, but as long as the wood of the console looked nice, Grampa and Grandma were happy. My kid sister and I had a horrible little portable phono (from EJ Korvette's) with an RIAA stage almost part for part out of the tube manual circuit you cited.Separate preamps were the preserve of "real" hifi and sold in far fewer numbers than, say, RCA consoles. The typical preamp circuit of the day was a two tube feedback circuit, often with distortion-causing positive feedback to get the open loop gain high enough for two tubes to have a fighting chance to approximate RIAA. At high frequencies, the poor second stage tube was gasping for breath, being loaded down by the dropping impedance of the network at high frequencies. If you went high end, you might get a cathode follower afterward, which certainly helped take the distortion from horrible to merely mediocre.
To quote Morgan Jones, there are no classic preamps. As usual, he's right.
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- Re: preamps versus mass market - Mahatma Kane Jeeves 16:29:50 02/17/06 (0)
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