[JN] buzz goes away when volume is mid way.

Larry Moore larrymooreattorney at gmail.com
Wed Apr 17 12:18:33 CDT 2019


Is the ground carried across both sections of the stepped attenuator?

> On Apr 17, 2019, at 1:17 PM, ben via Sound <sound at soundlist.org> wrote:
> 
> On 4/17/2019 11:04 AM, Paul Seymour via Sound wrote:
>> Hi Jo's
>> can I ask for your wisdom, I am stumped on this one.
>> I have a pre amp, similar to JELabs preamp with the 76 tube,
>> except I have all 6SN7's.
>> I have this BUZZ in right channel only.
>> I switched inputs and output's and always this channel
>> of the pre amp has the buzz.
>> *Strangely if I turn up the volume pot on the pre amp *
>> *to mid way the buzz vanishes. (* Pot is on the input and
>> I've swapped inputs as said and it's the same result so it's
>> not the phono stage prior. )
>> *If the vol pot goes right up the buzz comes back.*
>> *Only in the middle does the buzz disappear. *
>> This bizarre symptom must point to something, but what?
>> thanks,
>> Paul.
> 
> Bad solder connection to ground perhaps?
> Ben.
> 
> 
> _______________________________________________
> Sound mailing list
> Sound at soundlist.org
> http://mailman.soundlist.org/mailman/listinfo/sound



More information about the Sound mailing list