Please help with transformer bose 901 Series 3

[Xento87]

Hi all, I need help with transformer my equalizer bose 901, I need to know the output voltage of the transformer, buy it on ebay and my surprise was that when removing the transformer was not the original, anyone can help me or give me the wiring diagram, thank you very much, forgive for my low level of English

 

[Xento87]

more images

more images

 

[ecluser]

I am 95% sure that the transformer was a 36VCT (or 18V-0-18V if you prefer)

 

[larryderouin]

GOOD LORD! Even THAT Bose Deserves better soldering. My 3 year old grandaughter does better joints.

 

[grateful]

Does it work?

 

[Xento87]

Thanks:
Ecluser, if anyone can confirm having me as the original transformer is 36VCT.
Larryderouin if the soldering is very bad, who did not make such a bad job, but when I buy it already was.
* Grateful if that worked, but getting worse, now stopped working and just shows a few millivolts

have if someone can assure me the output voltage...

 

[GD70]

I believe the Bose web site has all the owners manual PDF's you can download for free. They have the information you need.

Glenn

 

[ecluser]

Thanks:
Ecluser, if anyone can confirm having me as the original transformer is 36VCT.

When I've made the schematic of the series IV equalizer I measured the output voltage of the transformer. I don't have the series III schematic, but I have the ones for the series I, series II and series IV. All of them have +20VDC after the rectifiers, so I have good reasons to think that it is the same for series III.

I measured 37VAC at the output of the transformer but I had 120VAC at the line at that moment. 36VAC is a standard value.

 

[Xento87]

GD70, I've searched but I only found the general manual 901

Thank you very much Ecluser is a very good information, could you give me the scheme series IV?, tomorrow I'll go to the store to by the transformer to shop my city and I would like to teach the scheme

 

[grateful]

It is possible the existing xformer is a perfectly good replacement. Normally they work or they don't. Disconnect it from the circuit and measure the ac output.

 

[petehall347]

thermal fuse inside the transformer is likely open ..