Give Talema a call... maybe??
This is from your photo:
.... and this is what I found on the net... (here's the website: http://www.tubebbs.com/thread-345364-1-1.html )
From the (limited) circuit diagram posted earlier, which contains the photo of the unit PCB as well, they used half wave bridge rectifier. So.... you could also disconnect the secondary windings, use a lab power supply, set the current limit to around 300mA... and then feed the DC to that black capacitor. Start with 20V and slowly increase the voltage... until you STOP seeing voltage change at point X:
Caveat:
You will need to "fool" the relay.... because the relay is part of a delay circuit... and its operation depends on the presence of the secondary wiring/secondary voltage.... i.e. the DC voltage required for that little protection circuit to operate DOES NOT come from that big capacitor.
This is from your photo:
.... and this is what I found on the net... (here's the website: http://www.tubebbs.com/thread-345364-1-1.html )
From the (limited) circuit diagram posted earlier, which contains the photo of the unit PCB as well, they used half wave bridge rectifier. So.... you could also disconnect the secondary windings, use a lab power supply, set the current limit to around 300mA... and then feed the DC to that black capacitor. Start with 20V and slowly increase the voltage... until you STOP seeing voltage change at point X:
Caveat:
You will need to "fool" the relay.... because the relay is part of a delay circuit... and its operation depends on the presence of the secondary wiring/secondary voltage.... i.e. the DC voltage required for that little protection circuit to operate DOES NOT come from that big capacitor.
Thanks Extreme_Boky for your contribution !
Very interesting !!
But my problem would be to know what ac voltage should come out of the secondary of this dead TALEMA transformer.
Raymond
Very interesting !!
But my problem would be to know what ac voltage should come out of the secondary of this dead TALEMA transformer.
Raymond
Call Talema... give them the part numbers and see what they have to say. I am sure they'll have a record of what they produced in their factory.
Good luck.
Good luck.
I just sent again a mail to Talema
Without much hope !
I also just managed to measure the secondary voltage, by supplying the transformer with 115v ( since one of the 2 primary windings - a 2x115v - is short-circuited ),
And I measured 32,1V ac.
So the secondary could be a 2x16Vac
And depending on the weight of the transformer ( 1050g ), with an ext diameter 93mm, it could be an 80VA
Raymond
Without much hope !
I also just managed to measure the secondary voltage, by supplying the transformer with 115v ( since one of the 2 primary windings - a 2x115v - is short-circuited ),
And I measured 32,1V ac.
So the secondary could be a 2x16Vac
And depending on the weight of the transformer ( 1050g ), with an ext diameter 93mm, it could be an 80VA
Raymond
Something doesn't add up...
In all gear and service manuals I have seen the 2 primary windings need to be connected in parallel for 115V operation and in series for 230/240V.
Or did my brain did my brain just s**t itself ?
In all gear and service manuals I have seen the 2 primary windings need to be connected in parallel for 115V operation and in series for 230/240V.
Or did my brain did my brain just s**t itself ?
Only one primary can be used, if the other one is not connected, and is not shorted.
If the other 115VAC winding were shorted, you would not have been able to measure with the other winding.
Here is a data sheet, but your toroid is not on it.
Contact info, just call or email them with the part number.
PO Box 935
900 Innovation Drive, Suite 120
Rolla, Missouri 65402
Tel: +1 573-303-3675
E-Mail: sales@talema.com
Web: www.talema.com
If the other 115VAC winding were shorted, you would not have been able to measure with the other winding.
Here is a data sheet, but your toroid is not on it.
Contact info, just call or email them with the part number.
PO Box 935
900 Innovation Drive, Suite 120
Rolla, Missouri 65402
Tel: +1 573-303-3675
E-Mail: sales@talema.com
Web: www.talema.com
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Dear Rayma,
"" If the other 115VAC winding were shorted, you would not have been able to measure with the other winding. ""
Possible, that you are right !!
Raymond
"" If the other 115VAC winding were shorted, you would not have been able to measure with the other winding. ""
Possible, that you are right !!
Raymond
Thanks RM for your nice pics !
But alas, yours is not the good one : it is for the 8000Q
And me, I am looking for the 8000C preamp
All the best for You,
Raymond
But alas, yours is not the good one : it is for the 8000Q
And me, I am looking for the 8000C preamp
All the best for You,
Raymond
THANKS R !!
For your 2 diagrams.
What a pity, there is no voltages indicated on the transformer secondary
Raymond
For your 2 diagrams.
What a pity, there is no voltages indicated on the transformer secondary
Raymond