I think your only hope with that is to come up with a service manual. We might be able to work backwards and derive the transformer voltage/s if we can see how its configured.
Is it a standby transformer with just two or three wires? Can't tell from the picture.
Is it a standby transformer with just two or three wires? Can't tell from the picture.
There's not enough information to go on there I'm afraid. The transformer you are holding looks quite small.
How many wire are there from the secondary? Is it just two wires that feed into here? If there are more then I think you are going to be looking for an original part.
How many wire are there from the secondary? Is it just two wires that feed into here? If there are more then I think you are going to be looking for an original part.
There are two transformers in the receiver. The one that is broken has 4 secondary windings. But it supplies the marked connectors. The X mark is powered by another transformer
Attachments
Its pretty unique. One big problem is the winding that supplies FL1 and FL2 which will be the filaments (heaters) on the display. That is going to be something like 3 volts (so 1.5-0-1.5)
The other windings can be estimated. The one feeding the 78/79 regulators will be something like 15-0-15 vac.
The one feeding Q102 will be around 38 vac to generate a 50 to 55 volt DC supply for Q102
Those would be my best guesses.
The other windings can be estimated. The one feeding the 78/79 regulators will be something like 15-0-15 vac.
The one feeding Q102 will be around 38 vac to generate a 50 to 55 volt DC supply for Q102
Those would be my best guesses.
A custom transformer would be very expensive to have made and you really would need to be sure of voltages. The ones I gave are my 'best guess' based on what they feed. The regulators need enough overhead. The 25v rating of the caps gives an upper limit. So around 21 to 22 volts DC as a maximum would be suggested. That equates to a 15 to 16 volt winding (15-0-15 vac). The display filament is a bit of unknown as to an exact value.
The VA rating would need working out by knowing the current draw from each winding and that is an unknown because we don't know the draw from the individual rails. They will all be different.
The VA rating would need working out by knowing the current draw from each winding and that is an unknown because we don't know the draw from the individual rails. They will all be different.
What have you done to get it to work? If its the original transformer i can guess 😉
You need to measure the AC current draw of each winding to estimate the VA needed. Some will be very low indeed such as the filament winding for the display. Perhaps only 2 or 3 VA for that.
You need to measure the AC current draw of each winding to estimate the VA needed. Some will be very low indeed such as the filament winding for the display. Perhaps only 2 or 3 VA for that.
I connected the transformer I had in stock. I will have a new transformer made. Yes, the power can be more than necessary, right?
Yes, there is no problem going higher in VA apart from cost and weight and size.
If you measure the size of the original and also weigh it then you can get an idea of total VA by comparing it to other similar transformers even though they might have only one or two windings. It would give you a starting point anyway. Compare like for like though in terms of construction such as toroidal for toroidal or EI for EI etc.
If you measure the size of the original and also weigh it then you can get an idea of total VA by comparing it to other similar transformers even though they might have only one or two windings. It would give you a starting point anyway. Compare like for like though in terms of construction such as toroidal for toroidal or EI for EI etc.
So not very large. The total VA rating won't be very high for that. You would have to do some research but it may well be only around 20 to 30 VA in total.