2PCs PSVANE Vacuum Tube HIFI diy Audio tube 811A 811

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2PCs PSVANE Vacuum Tube HIFI diy Audio tube 811A 811

Item specifics
Type:    Audio Tube
Model:    811A
Substition: 811
Brand:    PSVANE
Application: tube amplifier
Socket: 4 pins 
Material:Glass

Packaging Details
Unit Type: one PC in paper box

811A is direct-heated type thorium tungsten cathode high µ triode, can be used as high-frequency oscillation power amplification.

811 is similar to 811A, they can be exchanged each other.

Heater
Uf--------------------------------------6.3 V
If---------------------------------------4 A 
Maximum Rating
Ua--------------------------------------1250 V
Ia---------------------------------------125 mA
Pa--------------------------------------40W
grid current---------------------------------------50 mA
Operating frequency and Ua
When the operating frequency above 30MC, Ua and anode input power should be reduced as follows: 
Operating frequency(MC) Ua and anode input power
60 89%
80 70%
100 55%
 When it is in constant working, the anode should not be allowed to have slight red; when in interrupted working, it should only be allowed to have perceptible slight red.
Direct Interelectrode Capacitances 
Input--------------------------------------5.5 PF
output--------------------------------------0.6 PF
Grid to plate……………………………………………..5.5 PF
Static parameter:
Ua……………………………………………………….2000 V
-Ug……………………………………………………...2 V
Ia………………………………………………………26 mA
µ(Ia=20mA)……………………………………..160
Maximum rating in other operating conditions
R-F power amplifier or oscillation, C amplifier (CW)
                     CCS          ICAS
 Ua………………………………….1250            1500   V
 Ia……………………………………175             175    Ma
 Pa…………………………………..45              65     W
 Pa (in)……………………………..175            260     W
 Ug…………………………………-200            -200     V
 Ig…………………………………..55               50     mA
C amplifier anode-modulation, R-F power amplifier
                     CCS          ICAS
Ua…………………………………1000          1250    V
Ia…………………………………..125           150   mA
Pa………………………………….30            45    W
Pa (in)……………………………115          175    W
Ug…………………………………-200         -200    V
Ig……………………………………50           50     mA
CCS: constant working 
ICAS: interrupted working 

A-F power amplifier or oscillation 
B amplifier, grid driving 
                           Maximum Rating
                            CCS      ICAS 
Ua………………………………………………1250      1500      V
Ia (max. sig)……………………………….175      175        mA
Pa………………………………………………45        65         W
Pa (in) (max. sig)……………………165        235          W

Recommended operating condition (Reference value)
(The value of two tubes) 
                          CCS         ICAS
Ua……………………………………………1250        1500      V
Ug…………………………………………….0           -4.5       V
Ia (0)…………………………………………50          32        mA
Ia (max .sig)……………………………..260        313        Ma
Ũg (pk)……………………………………145         170        V
Pd (max. sig)…………………………..3.8          4.4       W
RL (a-a)……………………………………12.4         12.4      kΩ
Pout (max. sig)…………………………235         340      W






Factory history and overview


Changsha Hengyang Electronics Co., Ltd. specializes in R & D and the sales of audio tubes. All the items have passed the ISO9000 Quality System Certification. In May 2011, Changsha Hengyang Electronics CO., LTD was founded;

In July 2011, the manufacturing base was established in Changsha;
In August 2011, PSVANE’s first tube----845 was rolled off;

In September 2011, PSVANE 845 series began to supply our products to some main tube amplifier enterprises at home and abroad.

In October 2011, Changsha Hengyang Electronics Co., Ltd. wholly owned acquisition of a famous tube production enterprise in southern China, which sent shock waves through the industry.

In November 2011, PSVANE HIFI series (300B, 2A3, EL34, KT88, 5881, 6SN7, 274B and so on) were officially rolled off.

In November 2011, the company got the ability to develop and produce three series that cover more than 50 types of tubes. The whole strength and production-marketing scale are among the world’s top four, which is unprecedented in the industry. The foreign media said that “the future of the world’s tubes is in China, and the future of Chinese tubes is in Hengyang”.

In November 2011, PSVANE Reproducing Classic Series came to the market overseas and caused a sensation. 

In November 2011, PSVANE HIFI series fully entered to the retailing market aboard and well received by customers from the middle and low-end market because it has better sound, appearance, stability and cost performance than other brands. 

In May 2014, Changsha Hengyang Electronics Co., Ltd entered into Jiahai Industrial Park， which means has turned into a new page.