Hallicrafters SX-25 Super Defiant Receiver | Part 10: I.F. Alignment + Crazy HOT Sensitive Receiver!

Hallicrafters SX-25 Super Defiant Receiver, Made In: United States 1940-1946
Circuit Complement: 6SK7 1st RF Amp, 6SK7 2nd RF Amp, 6K8 1st Detector-Mixer, 6SK7 1st IF ANL, 6SK7 2nd IF Amp, 6SQ7 2nd Detector/AVC/1st Audio Amp, 6SQ7 Phase Inverter, (2) 6F6 Audio Amp, 6H6 ANL, 6J5GT BFO and 80 Rectifier.
Features: • ¼" Head. Jack • S-Meter • Tone (2 Pos.) • Bandspread • RF Gain • Mute Line • Standby • Speaker Terminals • ANL • AVC • Dial Lamp • Hinged Top Cover • BFO • Flywheel Tuning
Ranges: .54-1.7, 1.7-5.1, 5-15.7 and 15.2-42 MHz. The true bandspread covers: 80, 40, 20 and 10 meters.
www.dxing.com/...
people.ohio.ed...
The "Super Defiant"
The SX-25 is was introduced in 1940. It is an upgrade to the lower cost SX-24 "Defiant" introduced the prior year. With 12 tubes compared to 9 in the SX-24, the SX-25 featured push-pull audio in place of the single-ended audio of the SX-24 and an additional tuned RF stage for all bands except AM broadcast.
oldradios.50web...
At roughly 52 pounds this is a true Boatanchor.

[@multicyclist]

Thanks! A like and subscribe from me. This is the best video I have seen on the SX-25. I have one and want to restore it. I am not new to radio restorations or Hallicrafters radios but always like to see someone else do it before I do one. I also have some other Hallicraters receivers lying around I need to restore such as a SX-28, SX-100 Mark 1A, S-40, S40A, S-40B, S-20R, S-38C.

[@thevintageaudiolife]

Thank you so much for your support, I would love to get my hands on a Hallicrafters SX-28, but they are hard to come by now a days. The ones I’ve see usually are missing lots of parts and almost impossible to restore. Thank you please be on the lookout for the last part, RF alignment! Thank you very greatly appreciate your support.

[@multicyclist]

I will look for your future RF video. I bought my SX-28 to restore about 5 years ago when decent ones could still be had. It is in good condition, untouched and unmolested, and has no rust. It was very filthy, like it had been stored somewhere for a very long time in a dry place. At some point I will restore the SX-28, but plan on doing the SX-25 first. @@thevintageaudiolife

[@superhet7281]

First! ;-)

[@thevintageaudiolife]

Thanks for being First!

[@Francescawine]

I have Sx'24 , I rebuild it was working [ need a filiment transforner . The recrvtflyer lights up 5v but 6xc7 tubes ate cold. Any sugestion.

[@thevintageaudiolife]

@@Francescawine if you have filament (6 and 5 volts) but no high voltage then most likely your transformer has an open. This is very common issue with this model, you see a lot of transformers going bad due to capacitors shorting out on high voltage. Time for a transformer replacement.

[@Francescawine]

@@thevintageaudiolife yes our votages has increase to 126v AC that when the radio filliment transformer got hot.