Set up in 1995, Tonglu Valves Manufactring Co.,Ltd. is one of the leading China vacuum tube manufacturer and supplier in Yongjia County of Zhejiang Province. We manufacture all products strictly conforming to the API, JIS, ANSI, BS, GB, NF and DIN standards. Our oem vacuum tubes are available to users on request and are used for municipal works, petroleum, chemical industry, power station, metallurgy, national defense, and scientific research fields.

Drive-Thru Vacuum Tube, 4 Side Opening. TJ Fullmusic Premium 300B mesh-style plate, ceramic base, gold pins, strengthened plate structure. Excellent midrange, great sounding tube. Directly heated power vacuum tube with a carbon anode capable of up to 30 watts in single ended operation. This behemoth was designed as a transmitting tube, and is for those who require raw power and jaw dropping musicality in their listening room. It is a replacement for VT4-C types. Same pins as the 845. Great power! These tubes were early switches and current modifiers before the transistor was invented which of course, led to the printed circuit and the highly integrated silicon chips we know today. Many audiophiles still use amps and pre-amps powered by tubes; they claim that this technology produces a softer, warmer, more pleasing sound than the harshness of transistorized circuits.

Output Power : 8W x 2 (Class A). Frequency Response : 15HZ - 30KHZ (+/- 2dB). Input Impedance : 100K ohm. Output Impedance : 4, 8 ohm. Input Sensitivity : 0.5-1V. S/N Ratio : 90dB. T.H.D. : < 1%
Tubes : 300B x 2, 12AX7 x 2 , 6P3P x 2, 5Z3 x 1. Weight : N.W. 8kg / G.W. 9.1kg. Size: 300mm×60mm×27mm. Here is a pair of ECC81 / 12AT7 Tubes that Mullard made for Daystrom. Test close to new and no shorts/leakage. Both have the large top 'O' getters. Marking is clean and clear . Both come with white boxes. A NICE pair of Mullards for your sensitive application! Few Pair of great looking pieces from General Electric, the 12at7. all are in fine shape, and tested strong. They do not have boxes. A collector's special vacuum tube. This tube useable as local oscillator in VHF television receivers in the range of 470-890 MHz. Naturally a High-Mu triode can be used for many other special purpose circuits like oscillators and RF amplifiers.

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