10-02-2017, 05:12 PM
It lives! 
I have a dreadful struggle with this one, I don't recall ever seeing a receiver in such a bad way.
I have had to change a number of resisors and capacitors, made much more difficult because their colours were so grimy and faded that I had a job to identify them. The Trader sheet was a lot of help, but was not all that clear in component locations. The volume control was o/c as well. Eventually, I got some faint sations with lots of crackles and whistles, and then got round to trying different valves. The output valve was the worst for emmission, and things were a lot better with a 6V6 in it. Now, with only 150 Volts HT, it is quite loud when tuned exactly on stations, but whistles and howls if slightly off tune. I noted that the 25uF cathode bypass on the o/p valve had gone down to about 100pF, but didn't replace it at that time, thinking it would not stop it working. Maybe things will improve when I put a new one in. I will definitely have a rest now, as it was beginning to bug me something awful. Lots of wiring to replace, and after it is working properly, will have to build a new PSU. Also led astray by one of the leads in my capacitance meter becoming o/c about an inch from one end, and only discovered when, clutching at straws, I metered both leads.
Bob
I have a dreadful struggle with this one, I don't recall ever seeing a receiver in such a bad way.
I have had to change a number of resisors and capacitors, made much more difficult because their colours were so grimy and faded that I had a job to identify them. The Trader sheet was a lot of help, but was not all that clear in component locations. The volume control was o/c as well. Eventually, I got some faint sations with lots of crackles and whistles, and then got round to trying different valves. The output valve was the worst for emmission, and things were a lot better with a 6V6 in it. Now, with only 150 Volts HT, it is quite loud when tuned exactly on stations, but whistles and howls if slightly off tune. I noted that the 25uF cathode bypass on the o/p valve had gone down to about 100pF, but didn't replace it at that time, thinking it would not stop it working. Maybe things will improve when I put a new one in. I will definitely have a rest now, as it was beginning to bug me something awful. Lots of wiring to replace, and after it is working properly, will have to build a new PSU. Also led astray by one of the leads in my capacitance meter becoming o/c about an inch from one end, and only discovered when, clutching at straws, I metered both leads.Bob
