Audible Illusions Modulus 3A noise

That sounds like a bad tube. You can try cleaning the sockets and pins  first tho.

If you plan to keep your AI in stock form, I suggest only using Russian tubes, Sovtek or the 1975 Voskhod 6N23P.

Do NOT try any others especially not an NOS type tube.

I've been repairing and referbishing AIs for around 15yrs.

Feel free to email; hope I've helped.

Hi Kevin,

Yes that's a good sign. The AI is dead quiet with tubes in decent shape. A bad hum 'usually' indicates a bad transistor whose noise does not travel.

EH will last a bit longer, but not nearly as long as Voshkod,OTK, Rocket Logo etc.

Enjoy your AI. If you want the ability to use real NOS 6922/7308 email me or IM me.

Mitchell

I use (below) with Deoxit D5 to clean sockets. For tube pins you can use D5 BUT, it will remove the printing - been there/done that. I use very fine steel wool with denatured alcohol, dependin g upon how badly tarnished the pins are.

https://www.cvs.com/shop/gum-proxabrush-go-betweens-cleaners-wide-prodid-767370?skuId=767370&cgaa=QWxsb3dHb29nbGVUb0FjY2Vzc0NWU1BhZ2Vz&cid=ps_oralc_pla&gad_source=1&gclsrc=ds