Copyright © 2006-2011 AudioNote Kits
www.AudioNoteKits.com
Page 45
Ohm Check
EXPLANATION
: There are a number of terms that we will
be using in this section that we should be familiar with
– the
HT or High Voltage or B+ is all the same thing
– this is the
HIGHEST DC voltage in the circuit typically and is the
voltage that we will be supplying to the Tubes in our audio
signal path.
THE UNIT IS STILL OFF AT THIS POINT
If you have a Multimeter set it to OHMS and measure the
resistance from B+ to GND on the M2 Board
– you can see
from the picture opposite the approx location on the board
to find these 2 points. You should see a reading in the 300K
ohm range
– this is a good sign – if you have a very low
ohmage then there could be a problem and you may want
to contact us first.
Electrical Testing
Take a power chord and plug in the unit but make sure the
amplifier is off.
Before the first power on we suggest the following steps:
1.
Make sure that you have a quiet environment when
you are turning on for the first time
– that way if there is
a problem with the circuit you will be able to see & hear
a crackle or a vibration or hum etc. if there is any.
2.
If you have a Variac then it would be useful to use it
so you can power on slowly and check DC voltages
– If
not we will just turn on.
3.
Press the Rocker switch such that the 1 is pushed
flat against the chassis.
4.
Observe the LED light turning on and also look for
glow from the tubes.
5.
Get ready to switch off immediately if anything goes
wrong.
6.
Get your voltmeter ready
– you will want to perform
a High Voltage check.
