[Boatanchors] Question for Eimac 4-65A Tube

William Morton w_b_morton at hotmail.com
Mon Nov 9 10:04:41 EST 2020

Hello Everyone,

Thank you all very much for your comments.  I think my son is looking forward to creating a few 'heaters' while playing with a filament power supply.

The caution of verifying the 6.0 volt max limit has been noted.

Best Regards,

William and Son

From: Boatanchors <boatanchors-bounces at puck.nether.net> on behalf of William Morton <w_b_morton at hotmail.com>
Sent: Saturday, November 7, 2020 12:50 PM
To: boatanchor <boatanchors at puck.nether.net>
Subject: [Boatanchors] Question for Eimac 4-65A Tube

Hello Everyone,

My son and I have a question regarding firing up the filament of a 4-65A tube with no connection to the grid or plate (and no plate cap heat sink, either):  If we light up the filament and leave it glowing for a long time, is there any danger to the tube?  It would be akin to using it as a nightlight (which we are not).  By a 'long time', let's say 5 hours.

Thanks in advance for any comments.

Best Regards,

William, and Son
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