Dyna FM-3 - Voltage Check Points; Tube Voltage Readings and Interpretation

VOLTAGE
CHECK
POINTS
All voltages are measured with the volume control at minimum. Unless otherwise indicated, all voltages are measured
between the point indicated and the chassis, using a vacuum tube voltmeter. Many of the voltages will vary widely under
different signal conditions. NO SIGNAL indicates that the dial is tuned between stations. QUIESCENT voltages are measured
with V6 removed from its socket. STEREO voltages are measured when tuned to a station known to be transmitting a stereo
signal.
PIN #
TUBE
CONDITION
1
2
3
4 5 6
7
8
9
VI
6AQa/Ecca5
NO SIGNAL
145 DC
0 .8 DC
6.3 AC 0
145
DC
0
.8 DC
0
V2 6ATBA
NO SIGNAL
-3 DC
1
'"
52 DC
2DC 0
6.3 AC 220 DC 52
DC 0
0
V3
6BA6
NO SIGNAL -.2DC
l
0
0
6.3 AC 85 DC 85 DC .4
DC
V4 6BA6 NO SIGNAL -.2DC
l
0
0
6.3
AC 82 DC
82 DC
0
V5 6AU6!EF94 NO SIGNAL -.45 DC
l
0
0
6.3
AC 10 DC 44 DC
0
V6
6AU6!EF94
NO SiGNAL
-2DC
1
0
0
6.3
AC
42 DC 85 DC
0
V7
12AX7!ECC83
NO SIGNAL 215 DC
-1.5 DC~
17.5 DC
6.3 AC 6.3 AC 125 DC
0
.9 DC
0
V8
QUIESCENT
0
205 DC
0
0
6.3
AC 29 DC
-.64 DC
53 DC
-.6 DC
EMM801
STEREO
0
20DDC
0
0
6.3 AC
180 DC
-14 DC:
l
150 DC
-7 DC:
l
V9 6V4!EZ80
ANY
255 AC
0
285 DC
6.3 AC 0 0 255 AC 0
0
V71 68l8/ECF80
QUIESCENT
29nc
0 78 DC 6.3 AC
0
72 DC 1
DC
1.5 DC -.15 DC
STEREO
45 DC
0 71 DC 6.3 AC 0 64 DC 1.1 DC 1.1 DC
-14 DCa
V72
12AX7/ECC83
ANY
135 DC
0
.85 DC
0 0 135 DC
0
.85
DC 6.3 AC
" This voltage will indicate whether or not the local oscillator is functioning and should not vary by more than one volt over the
entire tuning range when the oscillator is properly adjusted for the FM band. In measuring this voltag-e, the common lead of
the VTVM must go to the cathode (pin #3).
1 Use a 100,000 fJ resistor in series with the probe when measuring these voltages.
~ This voltage must be measured with the VTVM common lead connected to pin #3.
a These voltages vary with signal strength, but will always be negative. ,-'-
Quadruple section fllter capacitor lugs:
#1 285 DC
#2 255 DC #3 225 DC #4 220 DC
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