38A3
38A3 is also designated UY85.
Description
The 38A3 is a half-wave vacuum rectifier suitable for use in receivers with universal power supplies.
Construction
The 38A3 has an all-glass miniature envelope with a nine-pin base. The base is S 9/12 per Czechoslovak standard ČSN 35 8904. It has an indirectly heated oxide-coated cathode, designed for series supply from AC or DC. The tube weighs about 16 g.
Ratings
The heater is rated at 38 V with a current of 0.1 A. The maximum inverse voltage is 700 V. The maximum rectified (DC output) current is 110 mA, and the maximum peak rectified current is 660 mA. The maximum voltage between cathode and heater is 550 V.
| Designation | Evidence | Confidence |
|---|---|---|
| UY85 | 48 independent documents | confirmed |
Equivalence is asserted only where the archive's own literature states it directly, in at least 40 separate documents. Tubes that merely substitute in some circuits are not listed here.
Original manufacturer datasheets for 38A3, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| Rogers | 38A3 | PDF (121 KB) |
| Tesla | UY85 | PDF (696 KB) |
| Mazda-Belvu | UY85 | PDF (190 KB) |
| Philips | UY85 | PDF (156 KB) |
| RFT | UY85 | PDF (61 KB) |
| La Radiotechnique | UY85 | PDF (60 KB) |
| Philips | UY85 | PDF (59 KB) |
Documents held here and used to write this page.
- UY85 (filed under UY85)
- 38A3
1 further designation appears alongside 38A3 in the literature but below the evidence threshold used here, so it is not listed as equivalent.