Bottlehead Forum

Bottlehead Kits => S.E.X. Kit => Topic started by: physicsmajor on March 09, 2015, 08:01:14 PM

Title: Upstream component change eliminated noise I thought was from my amp
Post by: physicsmajor on March 09, 2015, 08:01:14 PM

Spoke too soon last night. Noise level is massively improved, but it must be due to upstream components as the noise is essentially identical balanced or unbalanced from the speaker taps.

Turns out the S.E.X. has been illuminating upstream deficiencies all along, getting no respect for it.

Apologies for the hasty overreach of a post...

Title: Re: Balanced output via speaker taps completely eliminated my amp's noise
Post by: mcandmar on March 10, 2015, 04:49:10 AM

Curious.  I guess in theory balanced wiring is supposed to cancel out common mode noise but i'm surprised it is noticeable at such a short distance.

Also the HE-500's aren't very efficient so if your hearing background noise with them the noise floor on the amp will be quite high.  To the point i would suspect something is wrong, bad solder joint, dirty tube contacts, or maybe just a noisy tube etc.

Title: Re: Balanced output via speaker taps completely eliminated my amp's noise
Post by: fullheadofnothing on March 10, 2015, 07:14:19 AM

Have you tried the unbalanced position while connected to the speaker outs?

Title: Re: Upstream component change eliminated noise I thought was from my amp
Post by: physicsmajor on March 10, 2015, 12:52:22 PM

Attempted. Equally good. A bit more investigation and I think this must have been something upstream from the very start.

Updated the original post...