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Topic: preamp put through RMAA tests (Read 2277 times) previous topic - next topic
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preamp put through RMAA tests

Revox A720 Preamp (1973) tested using Delta 410 24/96 card (loopback through input & output of the preamp). Tone controls off.

Frequency response (from 40 Hz to 15 kHz), dB: +0.06, -0.32 Very good (+- 0.5 dB from 20Hz to 30kHz)
Noise level, dB (A): -98.4 Excellent 
Dynamic range, dB (A): 97.8 Excellent 
THD, %: 0.0053 Very good
IMD, %: 0.013 Very good
Stereo crosstalk, dB: -81.1 Very good

General performance: Very good  (The specs say >70dB noise level but heck...)

Am I the only one that thinks they did something wrong 'in the good way' in the 70's & 80's with audio gear?

I'm 'dissapointed' only with the crosstalk. Anyone else curious to test his/her newer pre/amp in this way?

preamp put through RMAA tests

Reply #1 –
No, if you browse around the headfi amp forum you'll notice quite a bit of talk of vintage audio gear like 1970s Marantz receivers or  1960s(?) Fisher tube based receivers. Apparently the circuit and general build qualities were very good with some manufacturers and have stood up very well over the years.
 

preamp put through RMAA tests

Reply #2 –
Hey, anyone can build a simple preamp (without power supply) that costs less than 5$ per channel (1 or 2 opamps, and a few resistors and capacitors) and get similar measurements. That's why spending lots of $$$ on amplifiers doesn't make sense.