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.

2021年9月14日 · 下面是3Q4的交流点灯，因为灯丝有中心抽头因此可以直接用交流点（形成中性面），2P3有中头完全可以直接用交流点灯。 有一种灯丝上原有中心抽头的电子管如3A4（2P3)，3Q4，3V4，3Q5GT等，使用起来，就更方便，而且因为变压器的中心抽头很不容易恰好抽在中点，而电子管的灯丝是精密制造的，中心点非常准确，实际使用的效果更好。 经过多次的试验，这样使用直流电子管的方法，最好是用在收音机或扩音机的末级。 因为用了交流灯 …

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Title: 3Q4 Author: Tung-Sol Subject: FP-2003-09-28 Created Date: 9/28/2003 9:35:59 PM

3Q4 Mazda-Belvu P 3Q4.pdf (355364 bytes) (fr) 3Q4 Tung-Sol P 3Q4.pdf (117972 bytes) 3Q4 Sylvania P 3Q4.pdf (299428 bytes) 3Q4 Brimar P 3D6.pdf (53028 bytes) 3Q5G RCA (HB3) P 3Q5GT.pdf (66210 bytes) 3Q5G Sylvania P 3Q5G.pdf (49706 bytes) 3Q5GT

The N18 (direct equivalent = 3Q4) is a miniature dry battery pentode that was designed for portable radio receiver use. The output of 270mW maximum would only drive a small efficient loudspeaker, not hi-fi. The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 44 mm tall. References: Data-sheet, 3002 & 1040.

2007年9月6日 · 想用3q4或2p3制作前级兼耳放，用做前级时，从屏极输出；用做耳放时，从阴极输出。 问题是：单个3Q4或2P3阴极输出时，功率能不能推动耳机，耳机是32欧至200欧的，如K66、PX200等。

Warning: Substitutes are given as a guide only - please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application.

2007年7月31日 · 今天我朋友看见有人再买“德根”的3q4管子，7、8成新；问我，是不是真的，（由于卖管子的人是平乡的，所以特别犹豫！）我说，我没听说过德根出过3q4啊？？（小弟也二把刀，见谅），特问问各位老师，应该怎样鉴别这“德根”3q4管子的真伪啊？ 先谢谢了

The 3Q4 miniature dry battery pentode was designed for radio receiver use. The output of 0.27 Watt maximum would only drive a small efficient loudspeaker, not hi-fi. The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 45 mm tall. References: Data-sheet, 3002 & 1040. Type 3Q4 was first introduced in 1950.

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.

2005年5月2日 · I just got my hands on a pile of these small Tung-Sol 3Q4 power pentode http://www.mif.pg.gda.pl/homepages/frank/sheets/127/3/3Q4.pdf and am wondering if I can …

2023年7月10日 · Find many great new & used options and get the best deals for GE 3Q4 Vacuum Tube in Original Box at the best online prices at eBay! Free shipping for many products!

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 …

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Specially designed for a variety of applications including radios, guitar amplifiers, and other audio amplifiers. Our vacuum tubes are built to deliver outstanding performance, reliability, and sound quality. As one of the leading tube stores, we offer a vast selection of radio vacuum tubes and amplifier vacuum tubes for sale.

2025年1月19日 · "Power" pentode for battery radios, 270 mW out. Made in Holland.

3Q4: 3W4*§, 3A4, 3Z4, 3S4§, 3S4SF*§, 3Z4*§ Notes: * - Parallel filaments § - May not work in all circuits: Web References: 3Q4 (Mazda-Belvu) @ Franks Electron Tubes 3Q4 (Tung-Sol) @ Franks Electron Tubes 3Q4 (Sylvania) @ Franks Electron Tubes 3Q4 (Brimar) @ Franks Electron Tubes 3Q4 @ RadioMuseum.org

This is a suitable replacement for any 3Q4 tube type. Various brands.Price is for a Single Tube