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Dynaco SCA-50

Stereo Integrated Amplifier

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Dynaco SCA-50

Specifications

Power output: 25 watts per channel into 8Ω (stereo)

Frequency response: 15Hz to 45kHz

Total harmonic distortion: 0.25%

Input sensitivity: 1.65mV (MM), 125mV (line)

Channel separation: 60dB (line)

Semiconductors: 2 x IC, 2 x FET, 17 x transistors, 24 x diodes

Dimensions: 13-1/2 x 12 x 4-1/4 inches

Weight: 15lbs

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Reviewed Mar 21st, 2017 by vibecho

I have owned 7 Dynaco SCA-35s in the last 40 years and am a big fan of the 6BQ5 sound. Picked up this Dynaco SCA-50 for a low price with a long list of issues but a nice looking unit. Recapped the boards with Nichicons, replaced the balance control because it had a cracked carbon track, and cleaned the other controls. There was still an odd noise in the left channel that originated in the pre-amp. After listening and checking through the stages I realized it was a local AM station being picked up even though the tuner was not hooked up! It turned out to be the TBA231 OP amp IC in the tone control circuit. This very IC has also been a problem in some Sansui products in my experience. Sourced an ECG725 replacement for both the phono and tone stages.
This amp really comes to life. Out of a darkly quiet noise floor the tubelike bass and soft highs are reminiscent of SCA-35s I have owned but with a cool running unit weighing in at 15 pounds. The Darlington paired TIP transistors are very current happy. It even impressed my wife who listens with me to dinner jazz. Her opinion is that this amp is richer than others I have run in my main system. That means a lot to me because usually the response is that they all sound the same!
If you buy one of these and decide to recap then you need to plan about 5 hours to get at all the boards which are on the vertical and tough to get at.

 

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