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Quick check:
For a quick check on operation, set POSITION to mid-scale and measure
from grid (terminalS) to ground of each 6V6 stage.
Should be appro xi
mately
~130
volts. to indicate normal operation of entire channel.
(Test at 115 volt line.)
Then measure from terminalS of one 6V6 to
terminalS of the other 6V6 in the same channel; should not be more
than a few volts, to show normal operation.
PERIODIC MAINTENANCE
SANBORN DUAL CHANNEL DC AMPLIFIER
MODEL 150-2000
This is recommended every 500 hours of operation, or every 3 to 6 months, as deter-
mined by experience.
1. Replace the 6V6GT tubes in each channel - V2003, V2004, V2006, V2007.
Use a com-
mercial tube replacement, or use Sanborn replacement no. 68A-4.
2. Replace the 5R4GY tube in the power supply - V2001.
Use a commercial tube repla(
ment, or use Sanborn replacement no. 68A-43.
3. Inspect above-chassis for loose tube, controls, plug-in components, and connector
4. Inspect below-chassis for loose resistors, condensers, terminal boards, etc.
5. Look for evidence of overheated components - check visually and by smell for burr.
insulation, transformers, resistors, condensers, etc.
6. Look for frayed or burned-away insulation.
7. Check for dents, panel scratches, corrosion, and other mechanical abuse.
8. Blowout dust and dirt with an air hose.
9. Go through the steps of the Check Chart.
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