Last year my friend bought this "Northern Electric" mono theater rack sound system
from local seller and ask me to restore to working condition.
Problem was information for this brand is hard to find, not like Western Electric equipment
that you can find from many sources.
After find out for long time, I can collect schematics that refer to each amplifier in the rack.
Then I thought to cluster them in my blog.
If someone want information should spend less time than me.
Front side
Back
Inside of back side for replace tubes (after restore).
Close up
R7877B Control Panel
R4137B Monitor Amplifier
Single 6V6 with input & output transformers and 6X5 rectifier tube.
Also has 4 ohm winding to connect monitor speaker too.
Schematic for R4137A & R4137B.
R6EB Amplifier
Inside of R6EB.
R6EB schematic with Mic & Phono inputs.
Information for strapping input & output impedances.
R4136B Amplifier.
Can check bias for all signal tubes.
This model can use schematic of Altec 323B Amplifier.
R7879B Field Coil Power Supply.
Using large Selenium Bridge Diode.
Hope all of these photos and information can be useful for someone or many.
Cheers!!!
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