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PV10AL Transformer burned, help!
PV10AL Transformer burned, help!
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Old 24th November 2005, 05:31 AM   #1
Avantgarde is offline Avantgarde  Singapore
diyAudio Member
Join Date: Sep 2005
Unhappy PV10AL Transformer burned, help!


Currently i have a MV55 and PV10L bought together
from the importer and problem occurs when the biasing
lights is flicking and the light emmited out by vacuum
tube filaments is not constant, the spearker also give
out popping sound. I switched off the set and on it
back again and the set play well but after two songs
later the same problems come back again. I tried a few
times and the earth leakage circuit breaker started to
trip. I isolated the power ampand preamp and power
them up separately, the power amp biasing lights does
not flicker anymore. As for the preamp, it seems ok
and i let it on for 15 mins..when smoke started to
come out from the Transformer.

The transfomer is a Magnetek 783P2 and i cant find it in my country. Since there is no voltage indication in the transformer, i could not find other transformer to replace. Is there any body there to help me to advise what is the voltage require and what other brand of transformer i can use..thanks!
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Old 30th December 2005, 11:03 AM   #2
max29 is offline max29  Netherlands
diyAudio Member
Join Date: Nov 2005
Location: oosterhout
Magnetic 783P2 can be replaced.
you have 110v or 240V in singapore.
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Old 31st December 2005, 02:08 PM   #3
Avantgarde is offline Avantgarde  Singapore
diyAudio Member
Join Date: Sep 2005
Hi, thanks for your reply, we have 240VAC in Singapore.
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Old 7th July 2006, 04:54 AM   #4
senderj is offline senderj  Hong Kong
diyAudio Member
Join Date: Feb 2006
Location: Hong Kong

Did you manage to find out the output voltage of the transformer? I am planning to diy a pv10a but don't know the voltage neither. If you did, please also let me know.
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Old 7th July 2006, 02:07 PM   #5
ethermion is offline ethermion  Antarctica
diyAudio Member
Join Date: Apr 2005
Location: ffx station, va
Email magnetek at info@magnetek.it . They can send you a datasheet, and tell you where you might find one in .sg or .hk.

Keep in mind that the transformer smoked for a reason.
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Old 7th July 2006, 03:51 PM   #6
Avantgarde is offline Avantgarde  Singapore
diyAudio Member
Join Date: Sep 2005
Hi.. do you have the PCB layout of the PV10AL?? Thanks
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