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 Post subject: Trying To Identify Power Transformer Specs
PostPosted: Aug Sat 03, 2019 9:23 pm 
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I am servicing a receiver/amp for a guy and it has a non-original power transformer installed on the amplifier chassis.
I know the specifications of the OEM transformer, but need to know if this replacement is even close to what is required.

The replacement transformer has a 5 volt AC rectifier winding a 6 volt AC filament winding and a 650 volt CT AC HV winding, all of unknown current rating.

This is the part number on the replacement transformer:
E23379A
Under that number is this:
141020

Does someone have a way to identify this transformer and it's specifications?
Thanks.

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 Post subject: Re: Trying To Identify Power Transformer Specs
PostPosted: Aug Sat 03, 2019 9:53 pm 
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Well.... To start with, EIA code "141" identifies the manufacturer as "Coil Engineering" (the last three digits are the date code). Catalog data for "Coil Engineering" seems to be scarce and the data you are seeking may be very hard to find.

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 Post subject: Re: Trying To Identify Power Transformer Specs
PostPosted: Aug Tue 06, 2019 3:02 am 
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Location: Springwater, NY
If you cannot find the literature on that specific replacement transformer, see this thread for an article on estimating the HV winding:

https://www.antiqueradios.com/forums/viewtopic.php?f=10&t=354971

You can load test the filament windings, with tubes or resistors. You can then monitor transformer temperature over time.


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 Post subject: Re: Trying To Identify Power Transformer Specs
PostPosted: Aug Tue 06, 2019 3:12 am 
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Location: Detroit, MI USA
Your replacement power transformer is almost certainly an OEM part from another radio or amplifier, which could have been salvaged from a junked out unit, or even purchased as surplus from one of the many dealers selling production over runs and obsolete stock.

Since the part number format (E23379A) isn't readily identifiable as belonging to any specific radio manufacturer, it's unlikely to ever be able to identify the specs of the unit without knowing what radio or amplifier it was intended for originally.

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 Post subject: Re: Trying To Identify Power Transformer Specs
PostPosted: Aug Tue 06, 2019 3:56 am 
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Location: Gretna, Nebraska
Thanks for everyone's suggestions.
Here is the OEM data for the unit I am servicing.
The replacement transformer is missing the 12 volt filament winding, but otherwise seems to be fairly close.
This is out of a home entertainment center that has been tinkered with in the past, but I was able to get working today by installing a separate 12 volt filament transformer. I did not note any voltage droop with the replacement transformer during some limited testing today. I will run it some more tomorrow and see if there are any heating issues.

Attachment:
Transformer.jpg
Transformer.jpg [ 81.92 KiB | Viewed 201 times ]

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 Post subject: Re: Trying To Identify Power Transformer Specs
PostPosted: Aug Tue 06, 2019 7:45 am 
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Thordarson skips right over that C-M part number.
Attachment:
CM.jpg
CM.jpg [ 83.2 KiB | Viewed 191 times ]

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 Post subject: Re: Trying To Identify Power Transformer Specs
PostPosted: Aug Tue 06, 2019 4:36 pm 
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That has to be a fairly hefty transformer, with a 5U4 rectifier and 220 ma rating on the HV winding, and nearly 8 amps on the 6 volt filament winding. If yours doesn't overheat and physically fits the opening in the chassis nicely, it may have sufficient capability. That's about the size of a TV power transformer......which is where I would go if the one you have in there now ever failed or proved to be inadequate.

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 Post subject: Re: Trying To Identify Power Transformer Specs
PostPosted: Aug Tue 06, 2019 7:46 pm 
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Mr. Detrola wrote:
That has to be a fairly hefty transformer, with a 5U4 rectifier and 220 ma rating on the HV winding, and nearly 8 amps on the 6 volt filament winding. If yours doesn't overheat and physically fits the opening in the chassis nicely, it may have sufficient capability. That's about the size of a TV power transformer......which is where I would go if the one you have in there now ever failed or proved to be inadequate.


Physically, the replacement appears approximately the same size as photos of the original I have seen. And, yes it is massive. The original apparently had large heat sink fins attached to it to help dissipate excess heat.

Between the separate power amp and receiver, the tube compliment is 20 tubes with P-P 6BQ5 outputs on both left and right channels.

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