Tube 3Q4 or Röhre 3Q4 ID1454, Vacuum Pentode, Miniatur-7-Pin-Base B7G, USA 1940 and Power/Output shown. Radio tubes are valves.

The 3Q4 miniature dry battery output pentode was designed for radio receiver use. The output of 0.27 Watt maximum would only drive a small efficient loudspeaker, not hi-fi but quite loud in a small room.

Miniature sharp cutoff pentode primarily designed for use as a high-gain radio-frequency or intermediate-frequency amplifier. Its low grid-plate capacitance and high transconductance …

3Q4 POWER AMPLIFIER PENTODE Fil Coatedament . Filament Arrangement Pgrallel* Voltage . Current . Maximum Overal1 Length Maximum Seated Height 1-7/8" Maximum 3/4"Diameter Bui b Base A . Pin 1 - Fil.l-series) Pin Pin (-parallel)2-PIate Pm 3-Grid Pin 4 - Sc reen Mounting Position . MINIATURE TYPE . Series* f. 2i*r . 0.05 .

2 x 5A6 parallel class C amplifier, fundamental frequency. 3Q4 screen grid modulator driven by a carbon microphone with step-up transformer. 2 transistor inverter for 6V->150V

2012年2月18日 · The 1T4 is used as an IF amp. The 1S5 is a diode and Pentode sharing a cathode/filament. The diode detects the AM and DC level is filtered for AVC/AGC. The AC (audio) is amplified in the Pentode. Finally a Beam Tetrode (1S3 or 3S4 only differ in filament) is the audio output. It thus needs twice the filament current.

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2025年2月25日 · A (4) piece set of audio - guitar - amplifier - HAM - radio - TV tubes, type3Q4. Tubes check good on the Heath IT-17 tester. Test readings match up well. I will accept a check from.

2024年10月19日 · The 3Q4 Vacuum Tube is a miniature type used in the output stage of lightweight, compact, portable, battery-operated equipment. It requires a miniature 7-contact socket. Except for basing, it is identical to 3V4.

2023年6月29日 · Find many great new & used options and get the best deals for 3Q4 Amperex Vintage Vacuum Tubes NOS at the best online prices at eBay! Free shipping for many products!