Replacing Selenium Rectifiers in Tube Portable Radios

Replacing Selenium Rectifiers in Tube Portable Radios

Category:

Science & Technology

Tags:

• Replacing
• Selenium
• Rectifiers
• Tube
• Portable
• Radios
• Diode
• Repair

[CameramanLink]

Thanks for sending this. I wasn't sure how the "guess work" would work out if you just tried a resistor and turned it on. Having that variac is really handy for stuff like this. I need to remember this method when testing what values of resistors to use in power supplies. Really nice tricks!

[AllAmericanFiveRadio]

Thanks CameramanLink

Your welcome, and I'm glad you found it useful.

[cenzo188]

Very informative video. Nice Variac power supply you have there. I've been wanting to build one of those for a while.

[AllAmericanFiveRadio]

Thanks cenzo188

I use the Variac in conjuction with isolation transformer with out fail. Those two items are a must for the workbench.

[obbm2232]

Superb presentation, narration and diagrams, and very thorough. I am going to view more of your videos. Thanks!

[AllAmericanFiveRadio]

Thanks obbm2232

[CassetteMaster]

Thanks! I hope it works. My machine is a Standard Buisness Machines Co. "magnascriber" model 160.

[AllAmericanFiveRadio]

Correct. The voltage on your radio is AC and not supplied by the B+ power supply. For that type of radio the plate voltages need to be monitored as you try different series resistors.

[AllAmericanFiveRadio]

On a non-battery set the filament supply is not supplied by the B+. The voltage to watch on the non-battery is the plate voltages. I use the audio output plate voltage as a check then when that is correct I check the other plate voltages. And you are right to start with a resistor to large and then work down. Thanks.

[coolbluelights]

oh also I do know that the first number in a tube type is usually the voltage, like 12AX7 is 12V and so on. this radio also has a 35C5, so I'm assuming the filiment voltage is 35V right?