|
Tubes Asylum Questions about tubes and gear that glows. FAQ |
|
|
|
Tubes Asylum Questions about tubes and gear that glows. FAQ |
|
In Reply to: Really hard to do as these are nested negative feedback machines posted by Chip647 on March 5, 2025 at 09:35:08:
"Looking at the schematic, it appears that the only tubes that are run hard are the four 6DJ8 paralleled cathode followers."
The voltages and current shown on the schematic don't indicate unusually harsh conditions for those. The follower is dissipating slightly less than 1.8W. The data sheet shows a rating of 3.6W total.
Audio Research gear is always over-complicated with multiple areas of potential failure. Probably worth measuring voltages around the tubes that are failing before doing anything else. If everything seems OK, I'd be tempted to use a different tube type in the follower positions. The 6GU7 has similar curves, although filament current is higher. It's rated for 6W total.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Running hard? - Triode_Kingdom 22:55:27 03/05/25 (4)
- RE: Running hard? - Chip647 07:29:24 03/06/25 (3)
- Here's one way to fix it... - Triode_Kingdom 10:37:23 03/06/25 (2)
- RE: Here's one way to fix it... - Chip647 11:18:07 03/06/25 (1)
- RE: Here's one way to fix it... - Triode_Kingdom 11:57:10 03/06/25 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
