11-06-2021, 01:22 PM
(This post was last modified: 11-06-2021, 01:23 PM by Murphyv310.)
Thanks Rob.
The level of hum and overall noise was 200mv P-P at the speaker, the Fane Rob has fitted has an extended LF response and a higher sensitivity than the tiddly original which exacerbates the problem. The amp has multiple earth points, screen leads earthed at both ends and other poor constructional issues.
Looking at the ripple level we can see the smoothing etc is as it should be.
The level of hum and overall noise was 200mv P-P at the speaker, the Fane Rob has fitted has an extended LF response and a higher sensitivity than the tiddly original which exacerbates the problem. The amp has multiple earth points, screen leads earthed at both ends and other poor constructional issues.
Looking at the ripple level we can see the smoothing etc is as it should be.
Cheers.
Trevor
MM0KJJ. Member of, RSGB, GQRP, WACRAL, K&LARC.
Trevor
MM0KJJ. Member of, RSGB, GQRP, WACRAL, K&LARC.