help diagnosing a buzz after adding tube preamp

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Chris_B

Fixed Re: help diagnosing a buzz after adding tube preamp
« Reply #20 on: 25 Oct 2018, 08:32 am »
Everything is sorted out with the Microzotl preamp.  I finally contacted Mark at LTA and he was aware of the issue and quickly fixed it.  Apparently, there is a noise pickup issue associated with the volume board that is audible with sensitive speakers and/or high power amps.  I just happened to have both. The fix involved rerouting some wiring and changing out a couple parts.  They had the preamp back to me in 24 hours and it is dead quiet now  :D.

bluemeanies

Re: help diagnosing a buzz after adding tube preamp
« Reply #21 on: 25 Oct 2018, 02:25 pm »
I had a similar problem when I installed new Shaguang CV181"s in my SP14. I had a slight whooshing sound coming from my midrange.
What I did was simply switch the Output tubes to different locations on your pre-amp.
It worked!
Speakers are dead silent.
Hope this helps.