DIY HiFi Forum

RE: Need Help With Ella

192.28.2.17

In Reply to: RE: Need Help With Ella posted by hi-fi_guru on July 26, 2007 at 20:12:54

hi
sure..
grid stopper resistor : you are correct. these are mounted on the pcb originally with leads going to the power tube pins(1K?, exact value not super important). ideally, the resistors should be mounted as close as possible to the tube pin. so you could move the resistor to the pin and put a jumper on the pcb if you want. these would supress some tendency for oscillation at hf in the circuit. would not hurt, but i am doubtful that this is the problem.

the choke: i am not sure how to describe how this should be mounted as i don't have one in my ella.. but i can tell you how it should be connected from a circuit perspective. after the bridge rectifier there should be a capacitor (450V,220uf?) from HV to ground, then the choke should go in series from the + side of this cap. to another 450V,220uf cap. (+ side, - side to gnd). This point is then the B+ connection point (goes to circuit board and center tap of the output transformers).

let me know if you need clarification.

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