UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Discussion of subcircuits for homebrew valve testers

FrankB · 3rd Jul 2018, 7:35 am

In my tube collection I have several Military tube boxes with the notation:"Aged 100 hours" on them.
So they were burned in to stabilize the tube for critical circuits.
A co-worker years back told me when he replaced tubes in an electric organ with new ones, he would have to go back and re-tune it in a couple of weeks of use, where with used ones, they were stable once tunes.

3rd Jul 2018, 7:35 am	#33
FrankB Heptode Join Date: Oct 2005 Location: Olympia, Washington, USA. Posts: 664	Re: Discussion of subcircuits for homebrew valve testers In my tube collection I have several Military tube boxes with the notation:"Aged 100 hours" on them. So they were burned in to stabilize the tube for critical circuits. A co-worker years back told me when he replaced tubes in an electric organ with new ones, he would have to go back and re-tune it in a couple of weeks of use, where with used ones, they were stable once tunes.