Transformer - Audio Interstage, 10 mA
Equivalent to Stancor A53-C. 1:3 ratio overall. Center tapped secondary may be used for push-pull grids.
Specifications:
- Max. Primary Current: 10 mA
- Impedance Primary to Secondary (Ohms): 10,000 to 90,000
SKU:
P-T156
Item ID:
003437
UPC/EAN:
841358109713
Accessory Items:
| Impedance, Primary to Secondary | 10 kΩ to 90 kΩ | |
| Item Height | 1.36 in. | |
| Item Length | 2.365 in. | |
| Item Width | 1.224 in. | |
| Mounting Hole Center to Center A | 1.95 in. | |
| Mounting Hole Diameter | 0.187 in. | |
| Primary Current, maximum | 10 mA |
| Packaging Dimensions | 7.3 in. × 2.3 in. × 1.3 in. | |
| Weight (Packaging) | 0.343 lbs. |
My Project Lists
Questions and Answers
Click each question to see its answers.
4 answers
Hi,
I just bought 2 of this transformer, just to restore a Stewart Warner model 535, that has two audio interstage transformers with coils open.
My doubt is: which coil is to be connected to plate, the coil with 2 wires or the coil with 3 wires? Obviously the other coil is to grid. Thanks a lot. Regards.
Asked by vmoncholi on November 10th, 2020.
November 11th, 2020
Staff Member
We are not familiar enough with this model to offer any advice. We do have a schematic that might match your radio here: https://www.tubesandmore.com/sites/default/files/schematics/stewart_warner_corp_535_pg1-1.png
To Staff member that answered my question: I know it is not easy to answer on a particular model, but, in your experience, normally the primary is to connect plate to +HT, and secondary is to connect to grid next audio interstage?, am I right? Thanks
November 11th, 2020
Staff Member
What you have described is a common configuration used. The center tap of the secondary is typically grounded with the two ends of the secondary winding connecting to the grids of a push pull amplifier.
Thanks a lot. When I finish and resurrect the radio I will send to you a Stewart Warner 535 schematics enriched with components data and measurements that are absent from any literature you can find elsewhere today. I am very advanced today, but I need to build the power supply to test the radio. Cheers!!
1 answers
what are the leads on this transformer, 2 on the primary and 3 on the secondary??
Asked by Anonymous on November 25th, 2019.
November 26th, 2019
Staff Member
that is correct
1 answers
I bought this transformer a while ago - coming out of the primary are a red and a blue wire. This transformer will replace an interstage transformer on an RCA Radiola Model 82 Radio. The secondary leads connect to the push-pull amplifier, as you describe in the last question. From the primary on the original, there is a red/yellow lead that connects to the capacitor pack and the power transformer. Also from the primary, there is a red w yellow trace lead that connects to the tone control. Does it matter which connections the red and blue should make? Should the red on the new transformer connect where the red/yellow wire was? Thanks for your help.
Ken
Asked by Anonymous on January 30th, 2021.
February 8th, 2021
Staff Member
Generally the polarity of a transformer like this won't matter unless there is some sort of feedback in the circuit.
1 answers
So I’m reconstructing a Fender Musicmaster Bass amp and it uses the interstage as a phase inverter. Will this works as such?
Asked by Th3DrJFever on April 1st, 2021.
April 2nd, 2021
Staff Member
We are not sure what the specifications are for the transformer in that amp so we can't recommend this as a replacement.
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Product Reviews
Worked good in my Elmac AF-67
Perfect replacement for those bad audios in your 1920’s radios.
I used this to replace a grid drive transformer for a push pull output stage on my Majestic model 90B it worked very well.
It worked just fine...........
Used this to replace a push-pull xfmr with a bad primary on a 1929 Philco 86. Worked great! The compact size allowed me to place it under the original housing to maintain the vintage look and the radio sounds great!
A very good transformer, especially for the price. Audio interstage transformers are hard to get now, and this is a good source. I've used several in past years and had no problems.
a near perfect replacement for a suddenly defective 1st audio transformer in a crosley trirdyn special .good to have a spare on hand.
Used in a 1925 DeForest radio. Worked great. Radio is playing again!
Transformers arrived here in Christchurch New Zealand approx 2 weeks from order.Given Covid 19 conditions I am very pleased with this prompt service.Transformers are to be used in the restoration of two 1920's radios, Fada and Stewart Warner and it looks like they are going to be small enough to fit inside the original transformer housings. Good job Antique Electronic Supply.
I used a couple of these on an Atwater Kent model 20 big box, and worked fine.