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In Reply to: RE: OP Amps, Whats Your Opinion? posted by AbeCollins on June 24, 2015 at 18:58:38
Audio, phonopre is the most simple amp there is, little amp with RIAA correction, 6dB/oct. Worth 3 dollar material, mostly the casing.
Many so called Super High End manufacturers take benefit of those glossy magazine readers who think they buy something space age special.
A big con the audio industry. They only want your wallet and what's in it.
Follow Ups:
"phonopre is the most simple amp there is,"
A phono preamp that is well designed is the MOST difficult amplifier to engineer. Anyone can put together a simple filter with a 6dB/ octave slope, however that filter would not be close to the the RIAA curve. Further, it takes a real engineer design a circuit that is consistent in manufacturing and that does not degrade as the components age. Many in the DIY community build all sorts of power amps and preamps before tackling a phono stage. Anyone who believes that it is simple doesn't understand the process or the engineering.
RIAA slopes are 6 dB/oct with 2 crossoverpoints, more sophisticated rolloffs at 50 and 10 kHz.
Simple, 2 12AX7 triodes per channel, you are talking about VOODOO, victim of the audio accessoires for fancy prices.
I bet you use loudspeakercables 20 mm (1 inch) thick, gold plated, copper/silver alloy, 400 Dollar per meter. That is oke, good for economics.
True. But it goes to show what can be done with an inexpensive component in the hands of a good designer. The Graham Slee Era Gold V is a highly regarded phono.... as is the vacuum tube Aesthetix Rhea at 5x the price. Yet I preferred the sound of Graham Slee, op-amps and all.
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