Electronics > Projects, Designs, and Technical Stuff

Strange AC current source..("variator"????)

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SK_Caterpilar_SK:
There are 4 tubes with filaments. EF800 x2, ECC83(paralel filaments), 6B32 diode for the AC range.
The schamtic of the entire VTVM is in one of the posts above (I believe)

SK_Caterpilar_SK:
not more than 50C. Warm but not toasty. Just like your average sauna.

Globe Collector:
These iron filament, hydrogen filled AC constant current "barreters" are very old, they were first used in 1899 by Walther Nernst to regulate the current through his Nernst Glower Lamps and were initially made in 250 and 500mA models. Due to power dissipation, they could only sustain a voltage drop of 5-10v. Below this range they ceased to current limit and tended to behave like resistors, above this voltage range the iron filament started to glow red hot and eventually melted, open-circuiting the device permanently.

 To see an original 1901 model, follow this URL...

https://www.lighting-gallery.net/gallery/displayimage.php?album=2434&pos=149&pid=69895

coppercone2:

--- Quote from: Globe Collector on December 27, 2018, 12:47:33 pm ---These iron filament, hydrogen filled AC constant current "barreters" are very old, they were first used in 1899 by Walther Nernst to regulate the current through his Nernst Glower Lamps and were initially made in 250 and 500mA models. Due to power dissipation, they could only sustain a voltage drop of 5-10v. Below this range they ceased to current limit and tended to behave like resistors, above this voltage range the iron filament started to glow red hot and eventually melted, open-circuiting the device permanently.

 To see an original 1901 model, follow this URL...

https://www.lighting-gallery.net/gallery/displayimage.php?album=2434&pos=149&pid=69895

--- End quote ---

great website

SK_Caterpilar_SK:
Yeah I found out about that. The thing is that the filament looks like it had its days gone and has not much left. So Im either looking for a direct replacement or designing a semiconductor circuit as the replacement for the bulb

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