Tube DIY Asylum

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RE: CCS Issue

Posted by Paul Joppa on December 26, 2016 at 15:31:18:
Many years ago (10? more?) there were survival issues with the 10M90S. I was only peripherally involved at the time, but it was never really resolved - I think trying one chip after another until a survivor was found, was the best solution. Not really satisfactory!

Speculation at the time was oscillation; the chip does have an enormous transconductance. Injecting a signal could trigger misbehavior, especially if something is pushed out of its linear range. At very high frequencies, minor changes in layout or lead dress can lead to unexpected oscillation.

I can only find the 6E5P as a Russian version of the 6E5 tuning indicator tube - is that the right tube? If so, 27mA into a 6E5 seems high since the rated target current is 4.5mA. That could lead to clipping which can also trigger oscillations.