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Author Topic: OTS PT gone?  (Read 13028 times)
Fred.T
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« on: February 24, 2010, 04:57:31 PM »
Power On amp (on standby) and there goes fuse. Amp was working fine for several months, I assembled it myself.
I disconnect all the wiring from PT except PINK (220V) to switch and Black (0) that goes to mains input
Power On - fuse burned again.
I measured the resistance between taps but not sure what should I expect, transformers are not my cup of tea so to say.
Please any knowledge/advice is greatly appreciated, what measured values should I expect between taps (with the transformer disconnected of course), 0's, grounds (E) to to be sure that is something wrong with the PT. Except it's blowing fuse every time :-)
One more - I was using Fast blow fuse instead of SLow blow, didn't have any at home, but if the tran is OK that shouldn't matter that much, right?

THANKS!!
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ODME
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« Reply #1 on: February 25, 2010, 12:46:13 AM »
Quote from: Fred.T on February 24, 2010, 04:57:31 PM
Power On amp (on standby) and there goes fuse. Amp was working fine for several months, I assembled it myself.
I disconnect all the wiring from PT except PINK (220V) to switch and Black (0) that goes to mains input
Power On - fuse burned again.
I measured the resistance between taps but not sure what should I expect, transformers are not my cup of tea so to say.
Please any knowledge/advice is greatly appreciated, what measured values should I expect between taps (with the transformer disconnected of course), 0's, grounds (E) to to be sure that is something wrong with the PT. Except it's blowing fuse every time :-)
One more - I was using Fast blow fuse instead of SLow blow, didn't have any at home, but if the tran is OK that shouldn't matter that much, right?

THANKS!!


I wouldn't count on anything but trying it with a slow blow.

However, if you disconnected all the secondaries from the circuitry, so that the only connection to the transformer is the AC, and it still blows (with the correct fuse) - then the transformer is bad.
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mcinku
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« Reply #2 on: February 25, 2010, 07:26:26 AM »
My friend had an issue like that and PT was gone...

I got a new PT from Nik and at that time I measured both, just to see where the issue was. In my case it was 345-0-345 tap which went bad. See the picture attached...

BTW this PT is for 50W amp...

* OTS_PT.jpg (51.15 KB, 472x311 - viewed 787 times.)
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« Reply #3 on: February 25, 2010, 07:31:27 AM »
BTW when I received new PT I noticed it was bigger than the original one. Nik told me they improved the PT since they started with OTS...

You can see the picture here...
http://ceriatoneforum.com/index.php?topic=1463.msg10250#msg10250
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Fred.T
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« Reply #4 on: February 25, 2010, 08:42:24 AM »
Thank you all!

This chart is exactly what I needed.
On the PT there is a sticker saying 3/12 07 so I guess it's the older one.
Only thing that worries me is why it went bad. Must check everything in the amp..
Any suggestions what can/could cause PT goes bad, or it can be just bad PT
Anyway,THANKS!!!!
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mcinku
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« Reply #5 on: February 25, 2010, 09:58:02 AM »
In this case nothing else was wrong just the PT.

I don't know what caused this, perhaps a  voltage surge can cause this.  Huh?

...anyway, after I fixed the amp for my friend, I ordered a power conditioner for my amps.
I don't know if this is helping but at least it feels better  Grin
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« Reply #6 on: February 25, 2010, 09:58:44 AM »
Forgot to say...


... let us know which part of the PT went bad
 Wink
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Fred.T
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« Reply #7 on: February 25, 2010, 12:21:32 PM »
It looks like 345-0-345 is fried. But have to check with more precise DMM.
And, since the amp is on desk, it's time for mods and tweaks :-)
This is a 50watt stock OTS built according to Nik's layout from last year.
I guess I will try tweaks you posted in:
http://ceriatoneforum.com/index.php?topic=1000.msg7198#msg7198

I'll first try with bigger caps on Power stage (mine are still 100uF and on latest Nik's layout is 200uF)
then FET will be out and replaced with the Deep switch
pre OD pot to the back
...
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mcinku
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« Reply #8 on: February 25, 2010, 12:29:46 PM »
Enjoy your "tone quest".

 Wink
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Fred.T
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« Reply #9 on: February 25, 2010, 12:32:20 PM »
BTW, you're my neighbor, sused.

I am in Zagreb :-)
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mcinku
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« Reply #10 on: February 25, 2010, 12:39:42 PM »
Quote from: Fred.T on February 25, 2010, 12:32:20 PM
BTW, you're my neighbor, sused.

I am in Zagreb :-)


 Grin

Ako trebaš kakvu pomoč samo javi.
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Fred.T
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« Reply #11 on: February 25, 2010, 12:43:10 PM »
Genijalno, a ja lutam po svetu.  Grin

Lep pozdrav, sosed!
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bluesfendermanblues
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« Reply #12 on: February 25, 2010, 01:18:18 PM »
Nice greetings, to both of you  Cool
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« Reply #13 on: February 25, 2010, 02:41:35 PM »
Quote from: bluesfendermanblues on February 25, 2010, 01:18:18 PM
Nice greetings, to both of you  Cool

 Grin


Sorry for this local thingy...
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Fred.T
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« Reply #14 on: February 25, 2010, 05:38:01 PM »
I guess it wasn't so bad, just exchanging hello's on local familiar language. Hope we won't get punished by Forum Authorities.
 Grin
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