If you are reading your negative feedback resistor in circuit, then it is probably fine. In reality you are reading that resistor in parallel with the 1.5k next to it, since the OT secondary and the cathode resistor are both connected to ground. If you are unsure, then you can remove it from the circuit and then test it.
I was also wondering which brand of output transformer you are using, and which color secondary leads you are using because different companies use different colors.