Dynaco St-150 Power Amplifier in very good condition, everything works, 75 wpc, built in New Jersey!  I hooked it up to a pre-amp and speakers and it played clean and clear.  The front glass has a small crack on the right side, otherwise in great shape.  As with all vintage equipment, no guarantees as to longevity of it's performance.

Specifications:

Power Output Ratings: Less than 0.25% total harmonic distortion at any power level up to 75 watts continuous average power per channel into 8 ohms (40 watts per channel into 16 ohms, or 150 watts monophonically into 8 ohms) at any frequency between 20 Hz and 20 KHz with both channels driven. Distortion reduces at lower levels.

Available Power Output:

20 Hz to 20 KHz, both channels driven:

75 watts continuous average per channel @ 8 ohms; 
100 watts continuous average per channel @ 4 ohms; 
40 watts continuous average per channel @ 16 ohms.

Monophonically, 20 Hz to 20 KHz:

150 watts continuous average per channel @ 8 ohms;

Intermodulation Distortion: Less than 0.25% at any power level up to 75 watts rms per channel into 8 ohms with any combination of test frequencies. Distortion reduces at lower power levels. Power at Clipping, single channel, 2500 Hz, less than 1% distortion:

90 watts @ 8 ohms; 
130 watts @ 4 ohms; 
45 watts @ 16 ohms.

Half-power bandwidth: 37.5 watts per channel at less than 0.25% total harmonic distortion from 5 Hz to 40 KHz into 8 ohms.

Frequency Response: +0, -1 dB, 10 Hz to 40 KHz @ 1 watt into 8 ohms; ±0.5 dB, 20 Hz - 20 KHz @ 75 watts.

Hum and Noise: Greater than 95 dB below rated output, full spectrum.

Input: 35,000 ohm load; 1.0 volt for 75 watts @ 8 ohms.

Slewing Rate: 5 volts per microsecond.

Output Impedances: 4, 8, and 16 ohms each channel.

Damping Factor:

Greater than 80 to 1 KHz into 8 ohms; 
Greater than 50 to 10 KHz into 8 ohms.

Channel Separation: Greater than 70 dB by IHF standards.

Connectors: Inputs: phono jacks. Outputs: Color coded 3-way binding posts with standard 3/4" spacing.

Dimensions: 14-1/2" wide, 13-3/4" deep, 6-5/8" high.

Weight: Shipping weight 34 lbs; Net weight 29 lbs.

Power Consumption: 60 VA quiescent; 5 amps maximum; 50/60 Hz, 120/240 VAC.

Designed by:

Harry Klaus

Year Introduced:

1975