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9.3 Initial Tests
Let's begin by doing some basic tests, with the Phono Stage off.
A good place to start is to measure resistance. Let's have a look at the Chassis Ground, an important
(almost) universal ground point in the Phono Stage.
Try this:
Place your multimeter in Connectivity mode
Put one probe on the Chassis Ground
Check the following points to verify that there is zero ohms or close (a couple of ohms is OK)
between these ground points:
IEC Socket Ground
GND on the Phono board
Let’s move on to our first real power-up.
9.4 First Power-Up
IMPORTANT NOTE
Follow the turn-on procedure carefully. DO NOT AT ANY TIME ONLY INSTALL THE 5U4G RECTIFIER
TUBE WITHOUT ANY OTHER TUBES INSTALLED. The reason for this is that the rectifier is counting on
having a specific load to drive. If the rectifier is used without other tubes installed then the unit will
'see' significantly higher DC voltages, which can overextend the Power Supply capacitors. You could
possibly start hearing cracking noises and then who knows what, as they are beyond their
maximum voltage ratings.
PLEASE BE AWARE OF PROPER ELECTRICAL SAFETY.
There are sufficient voltages in this kit to give you a very nasty and harmful
shock, so be careful when powering on, debugging, and probing around.
If the initial resistance checks are OK then you can install the 12AX7 and 6922 tubes.
Summary of Contents for L5
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