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MicMix STUDIO B Master-Room spring reverb

 

 

The circuit side of the printed circuit (PC) board is marked with test point locations corresponding to the numbers below. The following test equipment is required as a minimum to properly test and adjust the STUDIO B Master-Room.

50 Volt, 100 ma well-filtered power supply DC Voltmeter - 20K ohms/volt
AC Voltmeter - High Z VTVM
Sine Wave Generator - Minimum 10 volts rms into 600 ohms

All measurements are taken to ground unless otherwise noted.
Decay control must be in the mid-point position, Reverb control CCW. Power line voltage required: 115 to 120 VAC (or 230 to 240 VAC)

Test
Point

Nominal
Reading

Limits
Min               Max

Notes

1

+53 DC
+49 DC

+51
+47

+55
+51

No load (no audio input)

2

+40 DC

+39 

+41

1 KHz sine wave input with level on STUDIO B input control full CW and generator set to provide a STUDIO B meter reading of zero VU.

3

+33. 5 DC

+33

+34. 5

 

4

+20 DC

+19. 5

+20. 5

 

5

+6 . 5 D C

+6 . 2

+6 . 8

 

6

See notes.
2. 0 AC

+19. 5
1. 8

+20. 5
 2. 2

Should be within ± 0. 2 volts of TP#4. 1 KHz sine wave as stated above.

7

See notes.

+19. 5

+20. 5

Should be within ± 0. 2 volts of TP#4.

8

See notes.

+19. 5 

+20. 5

Varies ± 0. 1~ volt as REVERB control is varied.

9

See notes.

+19. 5

+20. 5

Should be within - 0. 2 volts of TP#4

10

See notes.

 

 

Varies from +0. 1 to +0. 8 volts re:ative to voltage at TP# 5.

11

--

+11. 5

+12. 0

DC volts

12

+29 DC

+28

 +30

 

 
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