Someone, here in France, yesterday, had made voltage measurements for an 8000C.
But he didn't seem sure of everything.
He had found :
- 45vdc on the big electrolytic black cap,
- 69.5vac, between yellow wires and black wire ( the transformer secondary output ),
- that means two 35v secondary wirings.
If we calculate 69.5vac and 45vdc... do not go well together ?
Raymond
But he didn't seem sure of everything.
He had found :
- 45vdc on the big electrolytic black cap,
- 69.5vac, between yellow wires and black wire ( the transformer secondary output ),
- that means two 35v secondary wirings.
If we calculate 69.5vac and 45vdc... do not go well together ?
Raymond
The transformer is a 2 primaries and 2 secondaries so 2 x 30Vac = 60Vac if measured from both secondaries.
Also output voltage varies with 220V grid (you house supply) here in the UK is normally around 245V at the plug.
RM is right 43Vdc at the main capacitor gives you a 30Vac so you will be looking for a 230V with 30/0/30 50 or 80 VA transformer
Also output voltage varies with 220V grid (you house supply) here in the UK is normally around 245V at the plug.
RM is right 43Vdc at the main capacitor gives you a 30Vac so you will be looking for a 230V with 30/0/30 50 or 80 VA transformer
Thank you RS32 for your contribution !
- 43Vdc at the main capacitor, I agree, that is sure.
- Also, I would agree with you when you say that the two secondaries must be 30Vac ( so 2x30Vac ).
But then, why 69.5Vac was measured ( i.e. 2x35Vac ) at the terminals of the 2 yellow and black wires ( the output of the 2 secondaries ) ?
With such a doubt, it becomes difficult to choose the nice transformer !
I am still in the blind alley...
Raymond
- 43Vdc at the main capacitor, I agree, that is sure.
- Also, I would agree with you when you say that the two secondaries must be 30Vac ( so 2x30Vac ).
But then, why 69.5Vac was measured ( i.e. 2x35Vac ) at the terminals of the 2 yellow and black wires ( the output of the 2 secondaries ) ?
With such a doubt, it becomes difficult to choose the nice transformer !
I am still in the blind alley...
Raymond
Many things can cause that
For example maybe the supply was over the rated 220Vac in the plug (Assuming you have the EU version of the preamp) a supply of 230 would probably cause that remember the ac output of the transformer is not regulated.
Over here in the UK the supply voltage is always around +/- 245Vac but varies up and down a couple of volts during the day.
For example maybe the supply was over the rated 220Vac in the plug (Assuming you have the EU version of the preamp) a supply of 230 would probably cause that remember the ac output of the transformer is not regulated.
Over here in the UK the supply voltage is always around +/- 245Vac but varies up and down a couple of volts during the day.
After a moment of meditation...
And thanks to voltage measurements on the outputs transformer, made here by a very kind Owner of this preamp.
I just bought a toroidal 80VA 230Vac / 2x30Vac.
It will remain to know if it will work well !!
Raymond
And thanks to voltage measurements on the outputs transformer, made here by a very kind Owner of this preamp.
I just bought a toroidal 80VA 230Vac / 2x30Vac.
It will remain to know if it will work well !!
Raymond
But the problem is that we measure at the secondary outputs 69Vac ( 2 windings wired in series ) !!
Which suggests that the transformer should be a 2x35Vac ?
From the fact that Nuvotem-Talema refuses to answer and give the characteristics of its 90058-P2S2 transformer...
Everything is difficult.
Raymond
Which suggests that the transformer should be a 2x35Vac ?
From the fact that Nuvotem-Talema refuses to answer and give the characteristics of its 90058-P2S2 transformer...
Everything is difficult.
Raymond
Finally !!
Here today, the response from TALEMA-NUVOTEM, the manufacturer of this transformer.
And which reveals the characteristics of its transformer :
"" ""
Dear,
I will try to help you, but we have very little information available about such an old obsoleted transformer.
The total power rating is around 100VA continuous.
- Input windings are 2x115V±10%, ( Blue-White, Black-Brown ), suitable for series/parallel operation on 230V/115V, with an internal automatic-reset thermal switch, rated 120°C (Violet),
- Output windings provide a no-load voltage of 33V-0-33V ( Yellow-Red-Black ).
I trust this information is of some help.
Regards,
Declan Grady
Technical Manager, Talema Group
"" ""
Here today, the response from TALEMA-NUVOTEM, the manufacturer of this transformer.
And which reveals the characteristics of its transformer :
"" ""
Dear,
I will try to help you, but we have very little information available about such an old obsoleted transformer.
The total power rating is around 100VA continuous.
- Input windings are 2x115V±10%, ( Blue-White, Black-Brown ), suitable for series/parallel operation on 230V/115V, with an internal automatic-reset thermal switch, rated 120°C (Violet),
- Output windings provide a no-load voltage of 33V-0-33V ( Yellow-Red-Black ).
I trust this information is of some help.
Regards,
Declan Grady
Technical Manager, Talema Group
"" ""
Better late then never
You will be fine with the 30/0/30 transformer I can't see that preamp needing 1.6Amps to run
You will be fine with the 30/0/30 transformer I can't see that preamp needing 1.6Amps to run
Just out of curiosity what is the voltage you have on the primary and secondary with that transformer ?
Ok, one last time
What voltage you have on the primary and secondary with that transformer with it plugged in you know with the plug on the wall and the power button pushed in.
Is this clear enough ?
On the other and who gives a crap, glad you got it working and I'm sorry that I asked.
What voltage you have on the primary and secondary with that transformer with it plugged in you know with the plug on the wall and the power button pushed in.
Is this clear enough ?
On the other and who gives a crap, glad you got it working and I'm sorry that I asked.
Well that's my point. Who does give a crap? It depends entirely on the actual line voltage, the current draw, and transformer regulation.