9
Top view
HUM BALANCER: Hum adjustment screw for tubes V1 to V4.
BIAS ADJ.: Bias adjustment screws for tubes V1 to V4.
Button located on the front.
BIAS CURRENT: Allows to view the tubes V1 and V2 bias levels on the ampere meter when the small handle is
down and when the handle is up, you can see the bias level on the ampere meter for the V3 and V4 tubes.
1
2
3
The current adjustment must be the same for the 845
tubes or 300B tubes in order to obtain an optimal sound
reproduction of the Amplifier.
If you have any questions, please contact a local
maintenance service or your local dealer.
FRANÇAIS
DEUTSCH
ESP
AÑO
L
IT
ALIANO
ENGLISH
Bias adjustment for 845 and 300B tubes
Note: You do not need to perform the bias adjustment when using the amplifier for the first time.
Turn on the amplifier and wait for about ten minutes.
WARNING :
When making adjustments, be careful not to burn yourself with tubes that are very hot.
Select the tube you want to adjust (V1 and V2 or V3 and V4), then position the Bias Current and adjust the tube bias with
a small screwdriver. Make sure all the bias level for V1 and V2 are the same, V3 and V4 are the same.
Inspect the ampere meter on the front panel and make sure the needle is in the area ia=70mA shown on this diagram
(below).
V1 and V2:
845 tubes
V3 and V4:
300B tubes
V5 and V6:
310A tubes
V7 and V8:
12AX7 tubes
1
2
2
1
3
1
1
2
Summary of Contents for LM-845 PREMIUM
Page 16: ...www line magnetic eu...
