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Page 1. Page 2. Page 3. Page 4. Tube 5R4 or Röhre 5R4 ID, Full-Wave Vacuum Rectifier, Octal (, IO) K8A, USA and Power-supply shown. Radio tubes are valves. PLATE-SUPPLY RESISTANCE PER PLATE = RSEC+ N2RPRI, + RA. WHERE RSEC = DC RESISTANCE OF TRANSFORMER. * SECONDARY PER SECTION.

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IPZ40N04S5-5R4 Datasheet PDF

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All of these tubes have datashwet tested on the Amplitrex AT tube tester, the best tube tester on the market.

Works or money back two weeks.

All of these tubes have been tested for transconductance, shorts, gas, leakage and life. Actual rates apply to overseas shipping.

The tube tests strong and free of shorts. All of these tubes have a brown base and black plates.


These tubes were recently tested on a TV-7 tube test Construction Highlights – black plates, hanging side halo getter. Since vacuum tubes were made 30?.

5R4, Tube 5R4; Röhre 5R4 ID, Full-Wave Vacuum Rectifier

This includes poor print, oxidized pins, faint discoloration, or poorly box. Row 1 left to right: For sale is a chatham jan-cahg-5r4wga tube.

This tube has a low getter. This tube is clean and has no shadowing and label discoloration that appear with extended use.

However, it is not in its original box so All 4 pair have similar results. Tested on Hickok A. This page was last updated: Number of bids and bid amounts may be slightly out of date. See each listing for international shipping options and costs.