Welcome to our store. All our tubes directly come from the workshops of the original manufacturer of Shuguang Electron Group Corp.Ltd. in Changsha, China, without agents or distributors involved in the buying process, therefore, we offer you cheaper prices but variety of selections of the best Chinese manufactured tubes. we have the advantage of offering you most accurate multiple matches according to your requirements (like quads or sextets, etc). All power tubes are tested for microphonics, durability, and overall quality.Any tube comes with a qualified certificate of the Shuguang corporation. We accept bargain and extend favorable cooperation with friends worldwide.

    Shuguang, China's oldest and largest manufacturer of vacuum tubes has been in business since 1958. In 1983, Shuguang partnered with western firm LG. As of 2005 Shuguang had developed 120 types of vacuum tubes, and manufactured over 70 million units. A notable fact: Shuguang has produced eighty percent of 300B tubes ever made.

Warranty

       All tubes come with a 12 months warranty from the date of your purchase.

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 About this tube 

     The auction is for four tubes matched quad with the same data.

热丝加热

UH----------6.3               V

IH-----------1.6               A

极限额定值

阳极电压-----------------------600    V

第二栅极电压-----------------400    V

阳极耗散功率-----------------35     W

第二栅极耗散功率-----------6      W

阴极电流-----------------------175   mA

第一栅极电压----------------－300   V

热丝阴极间电压-------------+200    V

                      －300    V

第一栅极电阻

自偏压时：------------0.25    MΩ

固定电压：------------0.05    MΩ

极间电容

输入电容---------------------15      PF

输出电容---------------------10      PF

跨路电容---------------------0.85    PF

静态参数

Ua----------------------------250      V

Ug2---------------------------250      V

－Ug1------------------------14       V

Ia-----------------------------140     mA

Ig2----------------------------12      mA

Gm---------------------------11     mA/V

ri-----------------------------12      kΩ

Ia(max．sig)----------------150      mA

Ig2(max．sig)---------------28       mA

RL-----------------------------1.5      kΩ

Pout--------------------------12.5      w

Dtot----------------------------7        %

推荐工作状态：（参考值）

单管A1类放大：

Ua(b)-------------------------400      V

Ug2----------------------------225      V

－Ug1------------------------16.5      V

Ia(0)--------------------------87      mA

Ia(max．sig)----------------105     mA

Ig2(0)-------------------------4       mA

Ig2(max．sig)---------------18       mA

Gm----------------------------9     mA/V

ri-----------------------------27      kΩ

Pout--------------------------20      w

Dtot--------------------------13.5      %

推挽A1类放大

            固定偏压     自偏压

Ua(b)---------400    600     400  V

Ug2------------275  300      300   V

－Ug1---------23   31   Rk=140Ω V

RL--------------3.5   5       4.5  kΩ

Ia(0)-----------2×90  2×58  2×83  mA

Ia(max．sig) 2×135 2×136  2×95  mA

Ig2(0)---------2×4.5  2×2   2×3.6  mA

Ig2(max．sig)2×22 2×20.5  2×19.5  mA

Pout--------------55    100     41  w

Dtot---------------3     2.5     4   %

推挽AB1类放大 三极管连接

              自偏压   固定偏压

Ua．g2(b)---------400        400   V

－Ug1--------------40     Rk=525Ω  V

RL---------------------4       4     kΩ

(g1—g1．pk)------78      78      V

Ia+g2(0)-------------2×76  2×76    mA

Ia+g2(max．sig)-- 2×80 2×80   mA

Pout-------------------17     17     w

Dtot-------------------1.5    1.5    %

推挽AB1类放大：（自偏压）

Ua(b)-------------------------400      V

Ug2----------------------------310      V

Rk-----------------------------140      Ω

RL-------------------------------5      kΩ

(g1—g1．pk)----------------43      V

Ia(0)--------------------------2×85   mA

Ia(max．sig)-----------------2×92.5   mA Ig2(0)-------------------------2×5     mA

Ig2(max．sig)--------------- 2×12.5   mA

Pout---------------------------40      w

Dtot---------------------------0.7      %

推挽AB1类放大（固定偏压）

Ua(b)---------400    650     400  V

Ug2-----------270    310     300  V

－Ug1--------23     29.5    32.5  V

RL----------------3.5     3.5    5  kΩ

(g1—g1．pk)---46   58      65  V

Ia(0)----------2×85   2×75  2×50  mA

Ia(max．sig) 2×137.5 2×147 2×135 mA

Ig2(0)---------2×4.5  2×4.5  2×2.5  mA

Ig2(max．sig)2×17.5  2×19  2×16.5 mA

Pout--------------60    70     100  w

Dtot--------------0.6    1.5     3   %

推挽超线性连接

              A1类    A2类

Ua(b)--------------390      450     V

Ug2-----------------395      450     V

－Ug1---------- Rk=200Ω   48     V

RL-------------------5.6       4    kΩ

(g1—g1．pk)-----70       96      V

Ia(0)---------------2×85    2×75  mA

Ia(max．sig) --2×87     2×132.5 mA

Ig2(0)-------------2×6.3    2×6  mA

Ig2(max．sig)---2×11.5    2×19  mA

Pout----------------34       70     w

Dtot----------------1.5      2.4      %

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