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Message: <blockquote data-quote="silodweller" data-source="post: 996566" data-attributes="member: 21585">Hi there,Please forgive me if I am jumping on someone else's bandwagon or if I should be posting somewhere else but I seem to be having difficulty with my Quad 303 regulator board. I am unable to attain the 67v across pins 1-9. The best I can achieve is 74v. RV200 does absolutely nothing. Zener diode is showing good values. Both transistors have been changed for new components. One thing I have noticed is R204 which is marked 10k on the circuit diagram is not a 0.5w but rather a 1w resistor. Is that right? TR3 does not seem to be short circuit either. On the right hand driver board I am able to attain 33.5v, no problem but on the left the lowest I can get to is 34v. Bias is easily achievable on both driver boards. I have changed all transistors as well as resistors on the driver boards where required. If anyone has any ideas, advice or suggestions I would be very grateful.  :help:</blockquote>