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Jacob Roschy
Sep 19, 10

AZ1, AZ11, AZ12
Full wave rectifier

Rectification of the mains alternating current to generate anode direct voltage in AC mains receivers.

properties: AZ1 or. AZ11, as a unit type practically sufficient for all receivers with a simple output stage, can be used as a one-way or two-way rectifier.
AZ12, Special tube with a higher load, especially for receivers with push-pull output stages. AZ11 and AZ12 are specially designed for use in connection with the tubes of the "Harmonic Series" (new socket).

construction: Directly heated. Nickel band. Two disposable systems with heating filaments connected in series. Anodes connected to separate socket contacts A1 and A2. AZ1 with external contact base (8-pin); AZ11 and AZ12 with new 8-pole steel pin base.

Forerunner type: RGN1064 for AZ1 or AZ11, RGN2004 for AZ12 (with exactly the same technical data, but with the old pin base).

Instructions for use: The AZ1 is the "unit" rectifier tube for the A series, while the AZ11 and AZ12 are intended as rectifiers for the "harmonic series" (steel base). AZ1 and AZ11 can also be used as half-wave rectifiers, whereby both rectifier anodes are connected in parallel and the current intensity intended for full-wave rectification can be taken.
If a two-way rectifier tube with anodes connected in parallel is used for each rectifier path of the two-way circuit, then double the direct current can be obtained from the circuit.

The AZ11 tube corresponds completely to the AZ1 tube and differs only in the other socket. If you need a higher amperage than can be achieved with the AZ1 or AZ11, you can use the AZ12, which operates at a transformer voltage of 2 * 500 V eff. a direct current of 120 mA and at 2 * 300 V eff. allows a direct current of 200 mA. This tube should therefore meet all requirements that occur in normal radio receivers. If you need even higher currents or voltages for special purposes, you have to fall back on the older tubes, RGN1404 or RGN4004. The RGN1404 is a half-wave rectifier tube which, with a transformer voltage of max. 800 V eff. allows a direct current of about 100 mA. The two-way rectifier tube RGN4004, on the other hand, allows a transformer voltage of 2 * 350 V eff. a direct current draw of a maximum of 300 mA.

Finally, it should be pointed out that the older type RGN354 is also available for simple receivers like the Volksempfänger type, which works with half-wave rectification and a maximum transformer voltage of 250 V eff. gives a direct current of 25 mA. With regard to the loads on the rectifier tubes AZ1, AZ11 & AZ12, it must be noted that the load ratios for the current or voltage values ​​that deviate from the normal specifications must always be selected so that the product of twice the transformer voltage and the direct current drawn from the AZ1 or AZ1 tubes AZ11 does not exceed the value of 60,000 and for the tube AZ12 the value of 120,000. So you can z. For example, calculate that with the AZ11 or AZ1 at a transformer voltage of 2 * 450 volts, a direct current of 60000: 90 - that is approx. 67 mA, is permissible. The size of the achievable direct voltage depending on the drawn direct current can be determined from the curves in the appendix, whereby the equivalent resistance of the transformer has to be taken into account.

From: "Rundfunkröhren - Properties and application" v. Ludwig Ratheiser, Berlin 1939.