2AS15 temperature limited emission diode

[Karl W4KRL]

Saw this interesting vacuum tube diode on eBay:

http://www.ebay.com/itm/2AS15-A-KALOTRON-THERMOSEN-SATURATION-DIODE-POWER-SU
PPLY-TUBE-NOS-131-/221323573909?pt=Vintage_Electronics_R2
<http://www.ebay.com/itm/2AS15-A-KALOTRON-THERMOSEN-SATURATION-DIODE-POWER-S
UPPLY-TUBE-NOS-131-/221323573909?pt=Vintage_Electronics_R2&hash=item3387e9ba
95> &hash=item3387e9ba95

 

The plate current is highly dependent on filament voltage. The Tektronix 555
scope used this characteristic to regulate filament voltage.

 

Its construction and operation are well explained here:

http://www.radiomuseum.org/tubes/tube_2as15.html

 

73 Karl W4KRL

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