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Dynaco Stereo 70 Power Amplifier

Restoration Manual

Detailed Procedure & Guide

Page 20

R0 4-03

floating at nearly 500 VDC relative the amplifier chassis. Most DVM's are suitably

insulated however you should be advised nonetheless and take the appropriate

precautions.

11. Connect the amplifier to 120VAC mains.

12. Switch on the amplifier. Examine the Digital Voltmeter reading. It will begin at a

very high voltage (nearly 550 VDC) and begin to drop over time. This voltage represents

the normal charging of the quad electrolytic capacitor and actually is re-forming the

capacitor simultaneously via the 100K ohm resistor. Observe the reading over a 15 to 30

minute period. If after approximately 1 hour the voltage reading of the DVM fails to drop

to 10 volts or less, the condition of the Quad electrolytic capacitor is suspect and should

be replaced.

13. Switch off the amplifier, disconnect it from the AC mains, and wait at least one hour.

14. Slide back the heat shrink tubing and de-solder the 100K / 3Watt resistor from both

the red wire and lug #2 of the quad electrolytic capacitor.

15. Re-connect the red-wire from the previous step to lug #2 of the Quad electrolytic

capacitor.

16. Install the output tubes – the two small driver tubes will be installed later. Rotate the

bias adjustment potentiometers (located near the center of the chassis) completely

counterclockwise.

17. Connect the amplifier to the AC mains and apply power. Re-adjust the bias per the

Dynaco Owners manual.

18. Switch off the amplifier and re-install the two remaining driver tubes (7199).

19. Replace the covers and return your amplifier to service.