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 Post subject: Can someone ID this transformer?
PostPosted: Aug Wed 07, 2019 4:50 pm 
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Joined: Apr Sun 14, 2019 12:42 am
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I salvaged this transformer a long time ago and don't remember what it was out of. Can anyone ID what it is or it's specs? Any suggestions for uses?

thanks

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 Post subject: Re: Can someone ID this transformer?
PostPosted: Aug Wed 07, 2019 7:11 pm 
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Location: Annapolis, MD
Start by measuring the DC resistances of the windings. Label them with numbers and letters. For every pair where you get a reading, note the resistance. Start with your ohmmeter set on a scale high enough to measure 5kohms.

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"Measure voltage, but THINK current." --anon.


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 Post subject: Re: Can someone ID this transformer?
PostPosted: Aug Wed 07, 2019 7:16 pm 
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Image

Rich


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 Post subject: Re: Can someone ID this transformer?
PostPosted: Aug Wed 07, 2019 7:24 pm 
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Huh???

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"Measure voltage, but THINK current." --anon.


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 Post subject: Re: Can someone ID this transformer?
PostPosted: Aug Wed 07, 2019 10:09 pm 
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I second your Huh????? and raise you a whaaaaaaaa???

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 Post subject: Re: Can someone ID this transformer?
PostPosted: Aug Thu 08, 2019 1:09 am 
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I believe Rich has posted an example, showing comparative resistances of various windings.

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 Post subject: Re: Can someone ID this transformer?
PostPosted: Aug Thu 08, 2019 1:31 am 
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Now THAT makes sense......:)

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-Mark
"Measure voltage, but THINK current." --anon.


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 Post subject: Re: Can someone ID this transformer?
PostPosted: Aug Thu 08, 2019 6:28 pm 
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Location: Thornhill, Ontario, Canada
Rich, W3HWJ wrote:
Image... Rich
Rich is correct, this is the way to start. Then test on a Variac... apply a low voltage on the highest resistance winding and check all ratios. At some point the AC mains input winding will become obvious. Put that on the variac and bring it up carefully to 120 VAC. Measure all voltages. Done.
Cheers,
Roger

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 Post subject: Re: Can someone ID this transformer?
PostPosted: Aug Thu 08, 2019 8:31 pm 
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Location: Norfolk, VA
Tamura transformer made for Toshiba. Part number goes nowhere, but the TPL54 prefix is common Toshiba numbering. With it's size and the fact that most stuff built since 2004 has switchmode supplies, it is probably from a Toshiba VCR or Remote-equipped CRT TV.

Best bet might be to scan some older Toshiba VCR service manuals - I just looked at my dozen or so of the training manuals I have, and no joy. Some do have dual primaries, so watch out for that.

EDIT: Ixnay on it being a VCR power transformer - the Toshiba service videos clearly show the transformers were soldered to the board. No wire leads like yours.

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"Capacitor Cosmetologist since 1979"
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 Post subject: Re: Can someone ID this transformer?
PostPosted: Aug Thu 08, 2019 8:40 pm 
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Location: Norfolk, VA
Pretty clear - the orange and white are the primary, the blue is low voltage (pilot lamps) and the red-blk-red is the low voltage secondary - probably ~ 24-23VAC.

This follows a unwritten convention for the cheapie combination stereos of past (Lloyds, Daytron, Soundesign, etc). We'd get them in with open primaries. Check the main filter cap voltage first, then the pilot lamps, and go from there. What fun.... :lol:

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"Capacitor Cosmetologist since 1979"
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