26-10-2015, 04:06 PM
Terry wrote this I think further back:
"Having no idea of the age of the set, the connection between the smoothing and the reservoir sections of the smoothing can may be either a resistor or a choke, and I would guess that this is where the problem lies."
You were on the right track over the high voltage but it wasn't the resistor. What actually happened over the weekend was there were issues I had regarding the circuit from the first reservoir capacitor and also vintage electrolytic cans in general. So, I put everything on freeze and spent late Saturday night seeking information specifically on these old cans. I found quite a few American radio-builders automatically are inclined to snip out the leads of the original cans and replace with modern film capacitors. There is a conviction that the old cans aren't to be trusted and can cause hum or eventually put the tubes at risk. I wasn't really sure whether to simply put a new film cap in circuit and take the easy way. However, at this point I was intrigued and fascinated by these original cans.
I spent a great deal of time also comparing the smoothing circuits of both the HMV and the GEC because there were differences in design that had me very curious.
I now have all of these original problems cleared up and, after a few wiring changes, I have the correct output D.C. voltage I need for the output tube anode. The only thing I haven't done yet is the second big test (after I change a couple of resistors). I'm very optimistic at this point and have a good feeling.
So, having clarified that point, now for the less palatable bit:
I do not personally engage in the use of emotive or patronising language directed at other members on websites. I also dislike the current trend where people who are connected to engineering seem to be exhibiting excessive and pointless ego which I noticed on another website not too long ago. Here, in fact, are two quotes by Einstein I keep in mind:
(1)"No one does anything right in life till they realize they are making a mistake." (Einstein actually failed his basic electrical engineering exams to enter technical university)
(2)"Ego =1/Knowledge.."More the knowledge, lesser the ego, lesser the knowledge, more the ego...."
I also don't worry over going in different directions to accepted norms on the basis of earning a degree of status:
"The person who follows the crowd will usually go no further than the crowd. The person who walks alone is likely to find himself in places no-one has ever seen before.." (also Einstein).
I also respect Mark Hennessy and his efforts to create a friendly and tolerant website with hopefully a bit of sense of humour so won't get drawn into any flame wars here. Also, there are quite a few members here who have years of experience and expertise whose advice has been welcome.
And at that point I will end this thread and leave well alone.
"Having no idea of the age of the set, the connection between the smoothing and the reservoir sections of the smoothing can may be either a resistor or a choke, and I would guess that this is where the problem lies."
You were on the right track over the high voltage but it wasn't the resistor. What actually happened over the weekend was there were issues I had regarding the circuit from the first reservoir capacitor and also vintage electrolytic cans in general. So, I put everything on freeze and spent late Saturday night seeking information specifically on these old cans. I found quite a few American radio-builders automatically are inclined to snip out the leads of the original cans and replace with modern film capacitors. There is a conviction that the old cans aren't to be trusted and can cause hum or eventually put the tubes at risk. I wasn't really sure whether to simply put a new film cap in circuit and take the easy way. However, at this point I was intrigued and fascinated by these original cans.
I spent a great deal of time also comparing the smoothing circuits of both the HMV and the GEC because there were differences in design that had me very curious.
I now have all of these original problems cleared up and, after a few wiring changes, I have the correct output D.C. voltage I need for the output tube anode. The only thing I haven't done yet is the second big test (after I change a couple of resistors). I'm very optimistic at this point and have a good feeling.
So, having clarified that point, now for the less palatable bit:
I do not personally engage in the use of emotive or patronising language directed at other members on websites. I also dislike the current trend where people who are connected to engineering seem to be exhibiting excessive and pointless ego which I noticed on another website not too long ago. Here, in fact, are two quotes by Einstein I keep in mind:
(1)"No one does anything right in life till they realize they are making a mistake." (Einstein actually failed his basic electrical engineering exams to enter technical university)
(2)"Ego =1/Knowledge.."More the knowledge, lesser the ego, lesser the knowledge, more the ego...."
I also don't worry over going in different directions to accepted norms on the basis of earning a degree of status:
"The person who follows the crowd will usually go no further than the crowd. The person who walks alone is likely to find himself in places no-one has ever seen before.." (also Einstein).
I also respect Mark Hennessy and his efforts to create a friendly and tolerant website with hopefully a bit of sense of humour so won't get drawn into any flame wars here. Also, there are quite a few members here who have years of experience and expertise whose advice has been welcome.
And at that point I will end this thread and leave well alone.
