[Heathkit] RE: SB-200

[Glen Zook]

Both the Chinese 572B and the 811A tubes used to
suffer (may still suffer) from this.  The problem was
that the elements were not always aligned in the same
position as were the Taylor and other "NOS"
manufacturers tubes.  When they got hot the grid would
"sag" and short out to the plate.

Glen, K9STH

--- Peter Markavage <manualman at juno.com> wrote:

Wasn't there some issue with using the Chinese 572B's
in the horizontal position rather than in the vertical
position as is in most amplifiers? Something to do
with possible element sag under high heat/high current
conditions or am I dreaming.









Glen, K9STH

Website:  http://k9sth.com

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