Transformer - Output, 8 W, 4kΩ - 9kΩ impedance
|Primary Impedance||4,000 to 9,000 Ω|
|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.|
|Primary Impedance||4k Ω - 9 kΩ|
|Packaging Dimensions||2.8 in. × 1.8 in. × 1.8 in.|
|Weight (Packaging)||0.647 lbs.|
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Questions and Answers
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2 answers What is the maximum D.C. bias for this transformer?
Asked by Anonymous on December 26th, 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.
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.
1 answers 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, Lou
1 answers Is the brown wire center tap for primary? No drawing shown for the primary side; rather 2 drawings for secondary connections! Thanks!
1 answers Hello I have a bad power transformer on my SX-62. Do you have a correct replacement? Thanks.
Asked by Anonymous on September 6th, 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.
1 answers 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 you
1 answers My radio sends 400 dc volts to the transformer. Can this handle that?
1 answers Will this work with a single ended 6F6 output?
Asked by Anonymous on November 6th, 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.
1 answers Are the blue and brown wires on the primary used for both an impedance of 4k ohms and 9k ohms with the red wire always being a center tap or is the red wire used with one of the others for an impedance of 4k ohms?
1 answers Will this work with push/pull 6L6 tubes?