Defective 300B?

Tubes Asylum

Questions about tubes and gear that glows. FAQ

I ordered a pair of 300Bs from a reputable and helpful dealer. When they arrived I noticed that both had heaters seemed to be working fine and evenly colored but once the high voltage was applied one tube had a line of red-orange dots/hotspots on the metal across from the filament in a vertical centerline and evenly spaced.

The dealer will take the pair back but I am wondering what might cause that issue. I did try swapping channels but the problem followed the tube.

Thanks!

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McShane Design

Topic - Defective 300B? - mourip 16:22:19 05/02/19 (0)

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