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In Reply to: RE: Denon DRA-635r steeo receiver purchase posted by realistico on March 15, 2015 at 07:27:04
I agree with your assessment of Denon. I thought the units 'New Optical Class-A' slogan was all marketing. My research indicates it is a sliding bias as volume changes to keep the amp in class A at lower watts (I'm no engineer so my explanation is a bit crude), which is a Nelson Pass patent that was implemented by Denon.
Follow Ups:
I own an Threshold CAS-1, which is a sliding bias cascade Class A amp. It sounds great and runs cool, but I don't think Nelson Pass was the fist to come up with it. The Brooks Amplifier (vacuum tube) was sliding bias amp that I am aware of, so it was not a new concept when he Nelson Pass invented it.
Dave
I have a late 80's Denon PMA520 integrated amp with the optical class A. It has a very clear, open, detailed sound sound. I also have an early 90's Sony ES receiver with a Legato optical class A, which also sounds very good. It is even more detailed than the Denon but slightly too bright and hard.
We carried Denon and Sony ES when I sold audio equipment. I liked them both. Both companies made very good receivers and separates. They also had some of the best CD players in their price ranges. It was very reliable stuff to. I have a couple 90's Sony ES CD players that work fine and still sound good to me.
Dave
Mjcmt, here are your DRA-635R's specs, per Institute of High Fidelity, according to Audio magazine's October 1991 34th Annual Equipment Directory: 80 Watts Per Channel Average Amplifier Output into both 4 and 8 ohm loads; 0.05 % Total Harmonic Distortion; 20 Hz to 20 Khz Rated Full Power Bandwidth; Moving Magnet Phono Input has 86 db Signal To Noise Ratio A Weighted into 5 mV; Moving Magnet Phono Input Overload is 120 mV. Dynamic Headroom specs were not listed for any Denon receiver. ... Digital F.M. tuner: 10.3 dbf Sensitivity in Mono Reception Mode; 15.3 dbf Signal Strength is required for 50 db Quieting in Mono Mode, 38.5 db in Stereo Mode; 1.3 db Capture Ratio; 0.08 % Total Harmonic Distortion @ 1 Khz with 100 % Modulation in Mono Mode, 0.15 % THD in Stereo Mode; 55 db Alternate Channel Selectivity; 82 db Maximum Signal To Noise Ratio in Mono Mode, 78 db in Stereo Mode; 40 db Channel Separation @ 1 Khz; 40 Total Digital Tuner Pre-sets. ... $500 retail, although a 6th Avenue Electronics City ad listed it for $376. ... 73s para Sactown
Thanks. The Denon specs the THD at an amazingly low .009%
When I sold Denon, the receivers always had great phono sections with MC inputs. The DRA-635R came out after I got out of the business. Did it have a MC input?
Dave
No, this receiver only has MM input. The more powerful ones did have the MC preamp.
Very interesting.
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