After making some adjustments according to the service manual, everything on the Beomaster 1900 tested out perfectly.

I began by verifying and adjusting the +15 VDC power supply.

While there’s no adjustment for the ±31VDC rail voltages, I always check them to ensure everything is as it should be. It’s best to identify any issues early on.

To easily measure these voltages, I connected probe wires to the collectors of output transistors IC200 and IC201 underneath the Beomaster. Thankfully, both measured within the acceptable range.

Next, I moved on to checking and adjusting the No-Load Current in the output amplifier section. Following a similar method, I attached probe wires underneath the Beomaster 1900, connecting two wires across one of the emitter resistors for each channel.

As instructed in the service manual, I set the No-Load Current trimmers to 12mA for each channel, with the volume at zero and no speakers connected.

Here’s a look at the right channel setup:

And here’s the left channel:

Eager to hear the results of my work, I decided to test the Beomaster 1900 before proceeding.

I connected my workshop’s Beovox S-55 speakers to the output and used an iPod Nano as an input source.

The sound quality was fantastic! Hearing music flow through a restored amplifier is always a rewarding experience.

Successfully playing music marked a significant step in the restoration process.

I took a break to enjoy the fruits of my labor, listening to music for about an hour.

My next task is to remove the wood trim pieces for easier access. I prefer working with them detached from the frame.