DYNACO ST-70 User Manual

1. 1MOhm potentiometers must be connected to inputs 7 and 17 of the PC-3 driver. If these
potentiometers are not present on the amp, 1MOhm resistors (R2 and R15) must be connected
to ground at inputs 7 and 17. If this does not happen, the PC-3 driver will fail and the signal will
have significant distortion!
2. The AB-Q ST-70 module is already preset to a cathode current tubes EL34 of 38 mA. There is no
need to set it again.
If you want to set a different cathode current on the EL34, follow these steps:

DYNACO ST-70 Specifications

General

Power Output	35 watts per channel
Output Impedance	4, 8, 16 ohms
Weight	32 lbs
Type	Stereo Tube Amplifier
Frequency Response	20 Hz to 20 kHz
Total Harmonic Distortion	1% at full power
Tube Complement	2x 7199, 4x EL34
Input Sensitivity	1.3 volts RMS for 35 watts output
Dimensions	10.5 x 6.5 inches