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An update to the 300a refurb. The relay board is back in the chassis and mostly wired up. I removed the board for the driver tube sockets and replaced the components I intended to replace as well as a couple of jumpers on the board.
[ATTACH=full]28340[/ATTACH]
Looking closely at the tube socket pins this afternoon I spotted a potential problem that needs to be addressed now while it is torn down this far. There are several “cold solder joints” around the tube socket pins. The circuit board holes for the pins are quite a bit larger than the pins themselves but there are visible “halo’s” around most of the pins.
[ATTACH=full]28341[/ATTACH]

The picture below is of one tube socket already repaired.
[ATTACH=full]28342[/ATTACH]

One more tube socket to repair and then I will see if I have the patience today to wind a couple of 4 turn coils for parasitic suppressors around 47 ohm resistors.

Stay tuned.

73’s
David

<blockquote data-quote="Dmans" data-source="post: 662250" data-attributes="member: 49046">An update to the 300a refurb. The relay board is back in the chassis and mostly wired up. I removed the board for the driver tube sockets and replaced the components I intended to replace as well as a couple of jumpers on the board. [ATTACH=full]28340[/ATTACH] Looking closely at the tube socket pins this afternoon I spotted a potential problem that needs to be addressed now while it is torn down this far. There are several “cold solder joints” around the tube socket pins. The circuit board holes for the pins are quite a bit larger than the pins themselves but there are visible “halo’s” around most of the pins. [ATTACH=full]28341[/ATTACH] The picture below is of one tube socket already repaired. [ATTACH=full]28342[/ATTACH] One more tube socket to repair and then I will see if I have the patience today to wind a couple of 4 turn coils for parasitic suppressors around 47 ohm resistors. Stay tuned. 73’sDavid</blockquote>

[QUOTE="Dmans, post: 662250, member: 49046"] An update to the 300a refurb. The relay board is back in the chassis and mostly wired up. I removed the board for the driver tube sockets and replaced the components I intended to replace as well as a couple of jumpers on the board. [ATTACH=full]28340[/ATTACH] Looking closely at the tube socket pins this afternoon I spotted a potential problem that needs to be addressed now while it is torn down this far. There are several “cold solder joints” around the tube socket pins. The circuit board holes for the pins are quite a bit larger than the pins themselves but there are visible “halo’s” around most of the pins. [ATTACH=full]28341[/ATTACH] The picture below is of one tube socket already repaired. [ATTACH=full]28342[/ATTACH] One more tube socket to repair and then I will see if I have the patience today to wind a couple of 4 turn coils for parasitic suppressors around 47 ohm resistors. Stay tuned. 73’s David [/QUOTE]

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