I have been building a close approximation to a Mullard 5-20. The only way I could get it to work was to reverse the leads coming out of the output transformer. This all seemed fine but recently it has stopped working. The output transformer makes a horrible whining/groaning sound. The grid voltages coming from the output transformer also seem to have leapt up to about the same as the anode voltage.
Anybody any ideas???
Thanks.
Anybody any ideas???
Thanks.