Hello folks,
I've got an old Popular Electronics June 57,p52 article of,"Rejuv-a chek". says...-
"In everyday use, the oxide coating of receiving tubes is gradually replaced by a layer of inert oxide"ash." As a result, cathode emission slowly decreases until it becomes insufficient for proper operation of the tube. In TV picture tubes this shows up as a dim picture with poor contrast, in others as low output, fuzzy quality, or loss of gain. By operating the tube heater at approx. 30% above it's rated voltage for 10 minutes, with no connectins to the other elements, this layer of dead ash may often be burned away to uncover a fresh layer of active oxide thereby giving the tube new life...." gasp, gasp
Suppose to (1) plug in a tube,(2)a bulb will light to indicate if the heater is intact,(3)turn a switch to cook the tube for 10 minutes.
???Anyone one know if THIS THING WORKS????
What is the amperge rating of the Stancor P-8130
12.6 volt filament transformer???
Thank You

Hi Chris

The Stancor P-8130 is rated 12.6 volts @ 2 amps.

You can clean up some oxide coated cathodes by increasing filament voltage. In receiving tubes, by making grid #1 slightly positive and forcing extra plate current, emission is often increased. I found this almost always works with some older tubes like 26. Once the tube is forced to draw excessive current then voltages are brought back to normal, emission may be normal.

The method you mention, only increasing filament voltage without other elements connected, works well on Thoriated-tungsten filaments.

Norm

: Hello folks,
: I've got an old Popular Electronics June 57,p52 article of,"Rejuv-a chek". says...-
: "In everyday use, the oxide coating of receiving tubes is gradually replaced by a layer of inert oxide"ash." As a result, cathode emission slowly decreases until it becomes insufficient for proper operation of the tube. In TV picture tubes this shows up as a dim picture with poor contrast, in others as low output, fuzzy quality, or loss of gain. By operating the tube heater at approx. 30% above it's rated voltage for 10 minutes, with no connectins to the other elements, this layer of dead ash may often be burned away to uncover a fresh layer of active oxide thereby giving the tube new life...." gasp, gasp
: Suppose to (1) plug in a tube,(2)a bulb will light to indicate if the heater is intact,(3)turn a switch to cook the tube for 10 minutes.
: ???Anyone one know if THIS THING WORKS????
: What is the amperge rating of the Stancor P-8130
: 12.6 volt filament transformer???
: Thank You

: Hi Chris

: The Stancor P-8130 is rated 12.6 volts @ 2 amps.

: You can clean up some oxide coated cathodes by increasing filament voltage. In receiving tubes, by making grid #1 slightly positive and forcing extra plate current, emission is often increased. I found this almost always works with some older tubes like 26. Once the tube is forced to draw excessive current then voltages are brought back to normal, emission may be normal.

: The method you mention, only increasing filament voltage without other elements connected, works well on Thoriated-tungsten filaments.

: Norm

:
: : Hello folks,
: : I've got an old Popular Electronics June 57,p52 article of,"Rejuv-a chek". says...-
: : "In everyday use, the oxide coating of receiving tubes is gradually replaced by a layer of inert oxide"ash." As a result, cathode emission slowly decreases until it becomes insufficient for proper operation of the tube. In TV picture tubes this shows up as a dim picture with poor contrast, in others as low output, fuzzy quality, or loss of gain. By operating the tube heater at approx. 30% above it's rated voltage for 10 minutes, with no connectins to the other elements, this layer of dead ash may often be burned away to uncover a fresh layer of active oxide thereby giving the tube new life...." gasp, gasp
: : Suppose to (1) plug in a tube,(2)a bulb will light to indicate if the heater is intact,(3)turn a switch to cook the tube for 10 minutes.
: : ???Anyone one know if THIS THING WORKS????
: : What is the amperge rating of the Stancor P-8130
: : 12.6 volt filament transformer???
: : Thank You