High pitch sequel or low frequency hum with Feedback circuit off

[smilch]

Just finished building a blues JR from the Hoffman kit . the amp was sounding pretty good and then I noticed I forget to hook up the feed back circuit . Thats when trouble arose . When the pot is turned off there is a high pitched squeal  coming from the speaker . turning all other pots switches make no difference , except the meat pot As soon as the pot is turned half way or more up the noise goes away . I checked connections and found a bad ground at the 4.7K resistor in the circuit going to the Meat Pot ..

Im sure someone has run into this . Just looking for some starting point suggestions .

[sluckey]

Swap the OT primary plate leads.

[smilch]

That was easy . problem fixed