Sarkes-Tarzian - S-490C - Rectifier, Selenium. Surge Arrester, Snubber
Special Price
$9.98
Regular Price
$14.50
READY TO SHIP - ONLY 56 LEFT IN STOCK!
SKU
21812
- Buy 10 for $8.98 each and save 10%
Sarkes-Tarzian - S-490C - Selenium Retifier, Surge Arrester, Snubber.
Rectifier, 8 Plates,
Nominal Dimension: 2" X 2" Plates X 1.045" Stack
DC Load Current: 200 PIV, 140 RMS V, 201 - 350 Amps
2-Lead 8-Wafer 2" Square.
Centre-Kooled - Blue
Marked 2A
Genuine Vintage Sarkes-Tarzian - New Old Stock
Additional Information: https://steampoweredradio.com/pdf/sarkes%20tarzian/Sarkes%20Tarzian%20Selenium%20Rectifier%20Handbook%201950.pdf
| SKU | 21812 |
|---|---|
| Condition | NS - NEW SURPLUS |
| Part Number | S-490C |
| Alternative Part Number | 4-166 |
Selenium rectifiers are made from stacks of aluminum or steel plates coated with about 1 μm of bismuth or nickel. A much thicker layer of selenium (50 to 60 μm) doped with a halogen is deposited on top of the thin metal plating. The selenium is then converted into polycrystalline gray (hexagonal) form by annealing. Each plate is able to withstand about 20 volts in the reverse direction. The metal squares, or disks, also serve as heat sinks in addition to providing a mounting place for the selenium disks. Plates can be stacked indefinitely to withstand higher voltages. Stacks of thousands of miniature selenium disks have been used as high-voltage rectifiers in television sets and photocopy machines
