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Troubleshooting - HP AR Operating And Servicing Manual

Wide band amplifier
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3-5
TROUBLE SHOOTING
Low gain, low output, and impaired frequency response are all di-
rectly related to tube mutual conductance and power supply output
voltage. Consequently, should any of the above symptoms appear,
the power supply output voltages should be checked (Paragraph 3-3)
and the tubes should be checked (Paragraph 3 -2).
Impaired frequency response, low gain, and/or excessive hum can
also be caused by open or shorted coils and by defective terminat-
ing resistors or screen resistors.
The can of electrolytic capacitor C9 is insulated from the chassis.
If this capacitor is shorted to the chassis the bias voltage will also
be shorted.
The bias voltage is normally not more than about 1. 8
volts and is not dangerous to personnel but tube damage can result
if this voltage is removed.
3-6
REPLACEMENT OF 200 OHM CABLE CONNECTOR
1.
Connect 200 ohm cable to length desired.
Trim end of cable
to a point where shielding and outer ins ulation are even with
the end of a center conductor support bead.
After assembly,
cable length to tip of banana plug will be approximately 1/4"
shorter than trimmed cable length.
FRONT PLUG ASSEMBLY
(46A-16CI
CONICAL WASHER 146A-16Kl
REAR PLUG BODY
/
BANANA PLUGj
(46A-16J)
(/25-33)
[D
DD
ICROSS SECTIONSI
' - - - - . , - - - - J
CENTER CONDUCTOR
SHIELDING
I
OUTER INSULAT ION
CAP
·0· RING 1432-40)
LARGE
WASH~R
II OR 2. SEE TEXTI
(512-134)
\.
, 2 · (SEE TEXTll
I
REAR RETAINER
(46A -16H I
200 OHM CABL E
(812 - 52)
LO - .. - 52
Figure 3-1.
Exploded View of the 46A-95B Assembly
2.
Remove outer cable insulation for a distance of 2" from cable
end.
3.
Remove three support beads from center conductor.
To do
this, upset shielding just enough to release beads.
-8-

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