Here I have a Crown D60. Dated 1974.
This has all original components including the electrolytic capacitors. Considering it's age it has impressive performance. DC offset is 0.001mV on both channels. THD measures 0.0027-0.0032% on both channels at 1Khz into a 8ohm load. Transformer is hum free and even the neon lamp still works. 47 watts into 8 ohm load at clipping.
I've always admired this topology from the designer Gerald Stanley of Crown. Patented class AB+B outputs run in a Class B. EF3 output stage. Quasi Comp output. Outputs only carry lower impedance, higher wattage loads. Only a very small amount of bias is running in the output transistors.
Very well made and easy to service.
I have many Crown amplifiers in my collection.
This has all original components including the electrolytic capacitors. Considering it's age it has impressive performance. DC offset is 0.001mV on both channels. THD measures 0.0027-0.0032% on both channels at 1Khz into a 8ohm load. Transformer is hum free and even the neon lamp still works. 47 watts into 8 ohm load at clipping.
I've always admired this topology from the designer Gerald Stanley of Crown. Patented class AB+B outputs run in a Class B. EF3 output stage. Quasi Comp output. Outputs only carry lower impedance, higher wattage loads. Only a very small amount of bias is running in the output transistors.
Very well made and easy to service.
I have many Crown amplifiers in my collection.
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Very good condition! I almost bought one of these back in the day but thought I needed more power (probably not true). I had the Crown preamp and lusted after the DC300 but couldn’t afford it at the time.
It does sound very good. Outputs at idle are dead silent even with 32 ohm headphones. The typical Crown bass slam is all there. Highs sounds absolutely fine. No issues.
Any temptation of investigating more recent options for the ua749? The impact on measured performance would be interesting.
Yes it can be done but with modifications. A well respected Crown service engineer that I know managed to do it with a NE5532