21-11-2018, 05:35 PM
Thanks, I had wondered.
In the circuit shown above, one is incorrect. The cathode bypass of V3 was originally 25uF. I had made a note on the diagram to put a 22uF one in, but when I wired it up, I inadvertantly left it off altogether and when I tried it, I could hardly hear anything, even on maximum volume. I had it upside down and switched on, and the only capacitor to hand, lying on the table, was a 0.1uF. I held it across the cathode resistors and immediately, the voulme shot up to normal. I never even tried the 22uF that I had intended to fit, but soldered the 0.1 in! I may try a 22uF eventually, but at the moment do not wish to mess about with it because I am giving a talk about it on saturday to the local model shipbuilding society, and then on the following Monday to a Royal Air Force welfare society that saw it on Facebook and for some reason would like to hear about it, and see it working.
Bob
In the circuit shown above, one is incorrect. The cathode bypass of V3 was originally 25uF. I had made a note on the diagram to put a 22uF one in, but when I wired it up, I inadvertantly left it off altogether and when I tried it, I could hardly hear anything, even on maximum volume. I had it upside down and switched on, and the only capacitor to hand, lying on the table, was a 0.1uF. I held it across the cathode resistors and immediately, the voulme shot up to normal. I never even tried the 22uF that I had intended to fit, but soldered the 0.1 in! I may try a 22uF eventually, but at the moment do not wish to mess about with it because I am giving a talk about it on saturday to the local model shipbuilding society, and then on the following Monday to a Royal Air Force welfare society that saw it on Facebook and for some reason would like to hear about it, and see it working.
Bob
