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In the Forum: Audio Discussions
In the Thread: Initial thoughts about new/old Lamm ML2s
Post Subject: The cycleing bias?Posted by Romy the Cat on: 1/10/2010
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 jessie.dazzle wrote:
Since renewing all tubes in both ML2s, over the period of about 3-5 minutes, the V2 bias on one of the amps cylcles between .27 and .33VDC. Is this behavior indicitive of a defective 6C33C?
That is not good. Try to shake the tube in the socket and see if the cycleling is corresponding in any way with shaking – it might be burned out socket where the arked spot on the socket does not work very well with the pink of THIS tubes (Paul do not start!). Check in the voltage from the regulator (175) is stable on another (old) tube.

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