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How to test an audio transformer | All About Circuits
https://forum.allaboutcircuits.com/threads/how-to-test-an-audio-transformer.168870/#:~:text=Nope.%20Output%20transformers%20were%20used%2064%20years%20ago,a%20very%20high%20voltage%20with%20a%20low%20current.
Vintage Output Transformer for sale | eBay
https://www.ebay.com/b/Vintage-Output-Transformer/67815/bn_55194053
Classic Transformers - Hammond Mfg.
https://www.hammfg.com/electronics/transformers/classic
¶Tube Audio Output - Push-Pull. Universal Push-Pull Tube Output. Audio. 125A-125E Series. General Replacement Tube Output (8 Watt) Push-Pull. 125H Series. General Replacement Tube Output (8 Watt) Push-Pull. Audio. 125J Series. Tube Output (10 - 280 Watts) Push-Pull - HI-FI. 1608-1650 Series. Tube Output (10 - 280 Watts) Easy Wire Secondary. Push-Pull - HI-FI. 1608A …
Audio Transformer - Transformers - Electronics Surplus
https://www.electronicsurplus.com/transformers/audio-transformer
Triad/Magnetics - SP62 - Transformer TF5RX17ZZ- AUDIO Output Transformer. This is a Red Spec audio transformers designed and constructed to meet the rigid requirements of MIL-T-27E. It features an epoxy molded case, gold plated leads and exceptional operation from 300 Hz to 60 kHz. Pri. 800 Ohms CT, Sec. 3.2 ohm, 4mA
Audio Transformers - Hammond Mfg.
https://www.hammfg.com/electronics/transformers/audio
Classic Tube Output Audio Transformer Overview. Universal Single Ended Tube Output. Audio. 125SE Series. Universal Push-Pull Tube Output. Audio. 125A-125E Series. Tube Output (25 - 75 Watts) Single Ended - HI-FI. 1627-1642 Series. General Replacement Tube Output (8 Watt) Push-Pull. 125H Series. General Replacement Tube Output (8 Watt) Push-Pull. Audio. 125J Series
Transformer - Output, 8 W, 4kΩ - 9kΩ impedance | Antique ...
https://www.tubesandmore.com/products/transformer-output-8-w-4k-9k-impedance
Used it as a replacement for a failed audio output transformer in an old radio using 2 - #45 output tubes. Replaced the trashed dynamic speaker with a PM, it sang like a bird! Dwight Baker - July 30th, 2021 . 5 out of 5. report this; Worked great for my application! blbii - April 26th, 2021 .
Old (very) audio output transformer. - Antique Radio Forums
https://antiqueradios.com/forums/viewtopic.php?t=76793
Old amplifiers are often found with output windings of 250 and/or 500 ohms. This winding was intended to feed remote speakers, using coupling transformers between the line and the speakers; the idea being to reduce power loss in the line by using higher voltage and impedance - the same concept being used for electrical transmission lines.
Output Transformer Impedance
https://www.radioremembered.org/outimp.htm
The function of the audio output transformer is to transform the high impedance of the output tube to match the much lower impedance of the speaker. This is necessary to get an efficient transfer of the audio signal to the speaker. The output transformer as an impedance matching device, works on the principal of reflected load.
Audio Transformer Substitutes - Radio Museum
https://www.radiomuseum.org/forum/audio_transformer_substitutes.html
for single ended applications as most of the tube radios and audio amplifiers are built, the output transformer needs an air gap to prevent it from DC saturation caused by the plate current. Most probably this Speco T-7010 transformer doesn't have one, because the originally purpose was for public adress usage where no air gap is required.
old and new school of output transformer winding | Page 3 ...
https://www.diyaudio.com/community/threads/old-and-new-school-of-output-transformer-winding.324485/page-3
The CMA-01 is a very High Quality “Ultra Linear” Push-Pull Valve Amplifier for serious Audio Quality Evaluation or sheer Listening Enjoyment. Features: • KT 88 Output Valves • Specially Designed Output Transformer by E. A. Sowter of the UK • Truly capable Phase Splitter and Driver Circuitry Must Hear to Appreciate the Quality of Valve Sound.
Antique Radio Forums • View topic - Output Transformer
https://antiqueradios.com/forums/viewtopic.php?t=381372
The opposite end of the primary winding of the audio output transformer connects via the third wire to the plate of your 42 tube. If you remove the original speaker and replace it with a PM type, you will need to substitute another smoothing choke for the original field coil to control hum, and it will need to have resistance similar to the original field coil to give the necessary drop in B+.
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