I visited Mouser to acquire some components for my Beogram project. However, upon commencing work on the main board, I realized I lacked a couple of 5KΩ multi-turn trimmers, essential for the 45 RPM and 33 1/3 RPM speed control (labeled 1R14 and 1R15). While I could order the parts, delivery wouldn’t be possible until Monday, and I was eager to keep the project moving.

Here’s a photo of the Beogram’s main board before removal:

The Beogram chassis still contains remnants of the broken transport lock bushing. I plan to thoroughly clean the chassis when I install the new Beolover bushings.

A view of the main board’s component side pre-recap:

I will be replacing the existing axial electrolytic and red tantalum capacitors with new 105° C options, using either electrolytic or WIMA MKS polyester types.

My initial task involves replacing the 45 RPM and 33 1/3 RPM motor speed trimmers (R14 and R15). I always opt for multi-turn, encapsulated trimmers in these instances because they offer superior speed adjustment control. I’m also swapping the RPM relay (1RL1) with a contemporary encapsulated relay – a convenient drop-in replacement manufactured by Beolover.

Here’s a comparison of the old and new components. You’ll notice some material deterioration beneath the original relay. This is irrelevant for the new relay board due to its integrated stand-offs.

With these components installed, I proceeded to replace the old electrolytic and tantalum capacitors. I also took the opportunity to replace the remaining three board trimmers.

Next, I will reinstall the main board and conduct a third 33 1/3 RPM speed test. I made adjustments to both the 33 1/3 and 45 RPM speeds using the new trimmers before initiating the speed test.