In Reply to: ferrite beads posted by Lew on February 27, 2014 at 08:15:58:
I know the characteristics of new tubes can cause issue in circuits where old ones existed.
I doubt the 10uf cap was chosen deliberately as a bandwidth limiting etc part. You could try a Solen 10uf in that position it has to be way better than the electrolytic.
If you want to try one, I have a couple that I can send you for the experitment.
This kind of spurious oscillation requires a good scope and injection of signal with lots of time to try grid stoppers, ferite beads and different values for bandwidth.. etc.
Time and frustration like chasing hum and radio frequency noise.
AJ
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Follow Ups
- RE: ferrite beads - AJ 11:52:31 02/27/14 (1)
- RE: ferrite beads - Lew 14:35:19 02/27/14 (0)