Hello,
Just wondering has anyone tried to fix old noisy transformer?
Mine is buzzing. I know that I should pour some kind of varnish in holes to make laminations stop vibrating.
But had read that not every varnish is suitable. Some can damage laquer on the windings 🙁
What products can be used?
Just wondering has anyone tried to fix old noisy transformer?
Mine is buzzing. I know that I should pour some kind of varnish in holes to make laminations stop vibrating.
But had read that not every varnish is suitable. Some can damage laquer on the windings 🙁
What products can be used?
"Pouring varnish through holes" is not good or enough.
You need to remove transformer, taking note on connections, maybe a couple pictures too, put it inside a small bucket, maybe an ice cfream container or similar, and fully submercge it in any home use type varnish.
Let it there for a couple hours, maybe change position a little, until NO bubbles leave it, and to let varnish get to the deepest points.
Then pull it by the wires, tie them to , say, a broom handle or similar stretched between two chairs and let varnish drip back into the can.
use abbundant old newspaper so as not to mess the floor.
Standard "synthetic" or "oil" based varnish , which uses a turpentine type solvent is NOT aggressive to plastics, enamel, etc.
Do NOT use car paint or even some kinds of wood *lacquer* type paints, even if transparent, those who need car paint thinner type because those contain some volatile solvents such as acetone, ethyl ethyer, etc. which CAN damage wire enamels , strip transformer paint, etc.
Let it drip fully and then at least rest overnight, 24 hours even better, so it air dries.
Then re mount on ampliier.
You need to remove transformer, taking note on connections, maybe a couple pictures too, put it inside a small bucket, maybe an ice cfream container or similar, and fully submercge it in any home use type varnish.
Let it there for a couple hours, maybe change position a little, until NO bubbles leave it, and to let varnish get to the deepest points.
Then pull it by the wires, tie them to , say, a broom handle or similar stretched between two chairs and let varnish drip back into the can.
use abbundant old newspaper so as not to mess the floor.
Standard "synthetic" or "oil" based varnish , which uses a turpentine type solvent is NOT aggressive to plastics, enamel, etc.
Do NOT use car paint or even some kinds of wood *lacquer* type paints, even if transparent, those who need car paint thinner type because those contain some volatile solvents such as acetone, ethyl ethyer, etc. which CAN damage wire enamels , strip transformer paint, etc.
Let it drip fully and then at least rest overnight, 24 hours even better, so it air dries.
Then re mount on ampliier.
^ I basically agree with this and noisy (small) transformers were a common complaint in things like clock radios and small items left on standby.
Soaking them doesn't always work either, you just have to try it and see.
I would also add that it can be worth heating the transformer to a low oven heat first so that the varnish really flows as well as possible and then as it cools it tends to pull the varnish into the nooks and crannies'.
Polyurethane yacht varnish comes to mind which is very tough.
Soaking them doesn't always work either, you just have to try it and see.
I would also add that it can be worth heating the transformer to a low oven heat first so that the varnish really flows as well as possible and then as it cools it tends to pull the varnish into the nooks and crannies'.
Polyurethane yacht varnish comes to mind which is very tough.