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Tuesday, September 30, 2025

Beomaster 4400 Type 2417 - Australia Project - Electronic Restoration Progress Update

After doing the initial assessment of the Beomaster 4400 Type 2417 I started in on recapping the main PCB (PCB 5).

Here is PCB 5 before recapping.









Here is PCB 5 after recapping.



























I removed the two 10,000 uF reservoir capacitors for the +-35 VDC rails of the output amplifier.































While I was working with the power supply components I removed and replaced the three bridge rectifiers in the Beomaster 4400.

I replaced the large bridge rectifier attached to the side of the transformer first.





















Next, I replaced the two bridge rectifiers at the other end of the Beomaster 4400 PCB 5 board.
I also replaced the 15 V Regulator that mounts to the side of the chassis.



Here are the new +-35 rail reservoir capacitors.






























So far I have removed and replaced 39 electrolytic capacitors in this Beomaster 4400.

For next time I will recap the Beomaster 4400 audio input board and the two FM boards to complete the last bit of recapping tasks.
I will also replace the thermal conductor insulators on the output amplifier transistors that mount to the Beomaster 4400 heat sinks. 

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