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Hi pitched hum from TT pre-amp?

Hello,

I have a Sonic Frontiers SFP-1 pre-amp. My rig is a Scoutmaster table and a Benz Micro Glider (MC). While playing a record last night, between songs I heard a relatively hi-pitched tone; probably a bit below the 1 Kilohertz frequency (test tone). I gently tapped the top of the TT pre-amp and the tone stopped! The pre-amp contains 4 tubes; two Sovtek 6922's and two 12AT7A's. Do you think I have a tube on its way out?

Any feedback would be welcomed.
judsauce

Showing 1 response by marakanetz

marakanetz's avatar
marakanetz
5,473 posts
 
i believe that this unit is over 20 years old and needs power supply caps replaced as well especially if new tubes didn't solve problem.
try to visualize dc caps with loupe for misshapes, blured painted tech info, signs of burning or high heat exposure on PCB in the connection area and also cold solder joints.
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