dont have any information about the toroidal other than the lable
the 15.5 is 20 or 19 gauge
rest of them are 30 gauge
yes
yeah cause the quantity is only one which made other manufacturing company turn down my request
yes i checked ,the primary is not open
i dont have a meter, i relied on the method mentioned by JMFahey
No i did not find any thermal fuse and i havent unwinded the primary yet
Ravindran, are you planning to repair the HT amplifier, or just to rewind the transformer and use it for something else?
If you find all the wires you unwound to be good, then you (or the company you hire) could rewind them in the same order, and should end up with the right winding (turn) numbers. There probably should be some insulation between the primary and the secondary windings; maybe the rewinding shop will have some suitable material.
But this does not guarantee that you will be able to repair the HT amplifier. Is there any burnt area or component, besides the slightly burnt smelling spot on the transformer? Also, as somebody already mentioned, it would be good to identify the thermal fuse on the transformer, and check it.
I'm not super hopeful that a repair can be done without at least a multimeter/DVM. Now, it could be that you might be able to identify a burnt component and replace it, but you still wouldn't know why it went wrong. It could also be that the transformer is slightly undersized, or that the ambient temperature got too high, and something in the amplifier went into runaway mode. In that case, just fixing the transformer and running the amplifier in a slightly cooler or higher airflow environment might be all that is needed to get a bit more life out of it.
It's good to try to fix things, and being an optimist is a better approach to life, but there is a certain not negligible potential for disappointment in this endeavor, I'm afraid.
If you find all the wires you unwound to be good, then you (or the company you hire) could rewind them in the same order, and should end up with the right winding (turn) numbers. There probably should be some insulation between the primary and the secondary windings; maybe the rewinding shop will have some suitable material.
But this does not guarantee that you will be able to repair the HT amplifier. Is there any burnt area or component, besides the slightly burnt smelling spot on the transformer? Also, as somebody already mentioned, it would be good to identify the thermal fuse on the transformer, and check it.
I'm not super hopeful that a repair can be done without at least a multimeter/DVM. Now, it could be that you might be able to identify a burnt component and replace it, but you still wouldn't know why it went wrong. It could also be that the transformer is slightly undersized, or that the ambient temperature got too high, and something in the amplifier went into runaway mode. In that case, just fixing the transformer and running the amplifier in a slightly cooler or higher airflow environment might be all that is needed to get a bit more life out of it.
It's good to try to fix things, and being an optimist is a better approach to life, but there is a certain not negligible potential for disappointment in this endeavor, I'm afraid.
If you don't have a meter, how do you know the primary is not open?
Yes OK (I missed that earlier in the thread!) - but he said it glowed brightly. Which does not sound good. The unloaded primary current should be rather low, so after initial charging of the magnetic circuit, the light bulb should hardly glow.