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Transformer - Output, 8 W, 4kΩ - 9kΩ impedance

Transformer - Output, 8 W, 4kΩ - 9kΩ impedance image 1

Customer image:<br/>"I repair old radios. I couldn't believe that I found one on your web site. Thank you, Klaus"

Customer image:<br/>"AES P-291 Replacement on Truetone D-1144 console 15" Speaker"

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Transformer - Output, 8 W, 4kΩ - 9kΩ impedance image 1

Customer Images:

Customer image: "I repair old radios. I couldn't believe that I found one on your web site. Thank you, Klaus"

Customer image: "AES P-291 Replacement on Truetone D-1144 console 15" Speaker"


SKU:	P-T291
Item ID:	003558

Price: $21^.39

In Stock

View Specifications, Files, and Documents

Type

Output Push-pull

Specifications
Output	8 W
Primary Impedance	4,000 to 9,000 Ω
Mounting Centers	2.375"
Weight	0.7 lbs

Specification:

Specification

Wiring Diagram:

Wiring Diagram

UPC/EAN: 841358109720

RoHS Compliant

View Product Measurements

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Specifications, Files, and Documents

Specification

Wiring Diagram

Product Measurements by Type (click to expand)

Product Measurements by Type
Item Height		1.643 in.
Item Length		2.797 in.
Item Width		1.445 in.
Mounting Hole Center to Center A		2.4 in.
Mounting Hole Diameter		0.18 in.
Output		8 W
Primary Impedance		4k Ω - 9 kΩ

Packaging Information
Packaging Dimensions		2.8 in. × 1.8 in. × 1.8 in.
Weight (Packaging)		0.647 lbs.

Product Reviews

5.00 out of 5 based on 16 reviews

Pages

5 out of 5

This seems to be the correct output transformer for Emery Sound Superbaby and Microbaby amps. It fits good and sounds great, so I'm calling it a win.

aaronalnight - December 13th, 2020

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5 out of 5

These are great as I work on old radios I keep a couple of these always on hand!

Aries Kosmetatos - November 22nd, 2020

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5 out of 5

Works great for a Philco 91X.

Philip OShields - February 14th, 2020

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5 out of 5

Had a 1942 Zenith 8S661 with one side of the primary winding of the output transformer open. This Hammond dropped right in - electrically and mechanically. It's the real deal for any 6F6 Push-Pull amp!

LoneTXRanger - November 14th, 2019

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5 out of 5

When restoring antique radios you occasionally discover defective output transormer. Usually the primary winding. So happy that AES supplies universal transformers at an affordable price. The audio is better than expected.

Keith A. - April 1st, 2019

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5 out of 5

Looks like a new supply of these, better build, with better output posts. Sounds great in small push pull triode amplifiers like the 12B4A and the 6CS7.

Jim Ryles - March 5th, 2019

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5 out of 5

Used this output transformer in a Philco 41-629 receiver. It works fine!

Repairman - September 1st, 2018

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5 out of 5

Used this output transformer in a Philco 41-629 receiver. It works fine!

Repairman - September 1st, 2018

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5 out of 5

Very fast shipping great service

G Yeakle - August 29th, 2018

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5 out of 5

Very fast shipping great service

G Yeakle - August 29th, 2018

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Questions and Answers

Click each question to see its answers.

What is the maximum D.C. bias for this transformer?2 answers

Asked by Anonymous on December 26th, 2016.

Answers (2)

Matt H.

Staff Member

December 29th, 2016

It doesn't appear as though we have that spec available for this transformer in particular. Both Hammond 8 Watt versions 125C and 125CSE have a max DC bias of 60 mA. Someone might consider that rating as a ball park reference for similar transformers, but you may want to consider the Hammond's instead of P-T291 if you need a guarantee on the rating.

humola18

May 10th, 2020

I believe that some push pull output transformers are built without an air gap in the core. In the primary of a push pull transformer the DC bias currents will cancel out provided the plate currents of the 2 tubes are equal. Then there will be no DC bias on the transformer. If the plate currents aren't equal, the difference between the plate currents is the DC bias on the transformer. If the transformer has no air gap, I suspect it would have very little tolerance for any DC bias.

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Hello, I have a Hallicrafters SX-62 (not the SX-62A) which I believe has a bad audio output transformer. What would be a suitable replacement? Thanks, Lou1 answers

Asked by Anonymous on May 24th, 2018.

Answers (1)

niceta58@yahoo.com

February 23rd, 2019

you can use P-T31 for this radio.it works great.

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Is the brown wire center tap for primary? No drawing shown for the primary side; rather 2 drawings for secondary connections! Thanks!1 answers

Asked by ceharizona on August 30th, 2018.

Answers (1)

BradWbr

Staff Member

August 31st, 2018

On this transformer, the red wire is the center tap.

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Hello I have a bad power transformer on my SX-62. Do you have a correct replacement? Thanks. 1 answers

Asked by Anonymous on September 6th, 2019.

Answers (1)

BradWbr

Staff Member

September 10th, 2019

We do not have sufficient cross reference material to verify the transformer required for your unit. If you can provide the specs required for the unit, please contact us direct and we can attempt to get you a replacement.

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Please let me know if this transformer will work in my Newcomb phonograph, which I am converting into a guitar amplifier. It has Push-Pull 50L6's driving an 8 ohm speaker. The schematic calls for a TR-215, but the primaries of currently available versions have no center tap. I have seen a similar schematic with 25L6's that calls for a 3000 ohm primary, but does not give a speaker impedance. I can send the schematics. Thank you1 answers

Asked by Anonymous on June 22nd, 2020.

Answers (1)

MikeT

Staff Member

June 22nd, 2020

The lowest primary this transformer is rated for is 4000 ohms so it does not look like it will be compatible with your requirements.

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My radio sends 400 dc volts to the transformer. Can this handle that?1 answers

Asked by Anonymous on July 19th, 2020.

Answers (1)

MikeT

Staff Member

July 22nd, 2020

As long as you are not exceeding the power rating of the transformer this will be fine.

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Will this work with a single ended 6F6 output?1 answers

Asked by Anonymous on November 6th, 2020.

Answers (1)

MikeT

Staff Member

November 9th, 2020

This transformer is meant for use with push-pull configurations. The P-T31 is a single ended transformer we carry that might be better for your application. Customers have reported that it works well with a 6F6 but please check your application to verify this.

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