Dynaco Stereo 150 Power Amplifier
I got this picture from eBay auction Item #290673144.
schematic pt. 1,
schematic pt. 2,
for the ST-150. You may want to right-click (Mac users click/hold) to save these, as they will slow your browser down significantly.
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.
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.
A reduced-power version of the Stereo 400, featuring identical output power transistors and a roomy chassis which invited its own spate of circuitry upgrades. Later revived and reissued by Stereo Cost Cutters/Sound Values when they inherited the Dynaco parts inventory, until they officially ceased Dynaco support in the early 1990s.
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Copyright © 2000 Greg Dunn