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In Reply to: RE: OP Amps, Whats Your Opinion? posted by AudioSoul on June 24, 2015 at 09:48:49
Like anything else, it depends on the designer's skill in implementation. There are crappy sounding op-amp based products like there are crappy sounding products that use all discrete components.... and the other way around.One of the best sounding phono stages I've had in my system used op-amps, high speed op-amps to be more precise, sometimes used as video amplifiers. It was the Graham Slee Era Gold V MM phono based on the Analog Devices AD817 op-amp.
My Cambridge 640p phono used op-amps and it sounded pretty mediocre. Go figure.
Edits: 06/24/15 06/24/15 06/24/15Follow Ups:
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.
"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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