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In the Forum: Audio Discussions
In the Thread: Initial thoughts about new/old Lamm ML2s

Post Subject: Problem solvedPosted by skushino on: 6/25/2010

Today I had a chance to connect everything back together - I had been using a spare amp while the ML2 was out of service. After replacing the tube sockets, the problem amp's behavior is stable. Not sure if the cause of the problem was the loose pin connections in the socket, or the poor soldering and loose wire connections, or both. Regardless, the operating points are stable and not fluctuating anymore, and there is no noise when using probes in the test points. I decided to increase plate current from .275 to .285. Plate voltage remains unchanged at 174.4v. Based on these results, I'll proceed with replacing the sockets on the second amp as preventative maintenance. There are currently no issues on this amp, but I'll sleep soundly knowing the OEM sockets are gone on both amps.

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