PSVANE 811A Vacuum Tubes replace SHUGUANG 811A FU-811 FU-811J SV811-3 for medical and textile mills, original factory matching
Questions and answers for users of common questions about 811 electronic tube medical treatment:
1. The electronic tube breaks after being used several times. Why?
The service life of the tube is closely related to the use environment, frequency of use, the condition of the machine and related accessories, and it is more complicated. Improper use or problems with the machine or other accessories will affect the normal use of the tube. The use of the same product is different for different customers. This situation is obviously abnormal. Please don't arbitrarily draw conclusions about the product, first check the key issues. If necessary, please contact the maintenance personnel to check the specific problems of the machine.
2. The electron tube is not as hot as before. What is the problem?
This problem is probably caused by the aging of the electron tube, or the problem of the output line or electrode plate. Please check the output line and electrode plate first, and confirm that the normal basic judgment is the problem of the electron tube. The electron tube needs to be replaced.
3. What should I pay attention to when replacing the tube?
It is recommended that the two tubes be replaced at the same time. One old and one new use will cause greater loss and reduce the service life of the tube.
We have tube sockets and tube caps for 811 electron tubes for sale(you can enter keywords in the shop search box: 811)
811 matching cap ceramic version (the largest number MCD and MCD-G, the last two options of color classification):
811 matching pipe cap with high brass bakelite version (the first two options of the largest color classification):
811 matching ceramic socket (there are many kinds of matching sockets, only three commonly used ones are listed, if you want to learn more about consulting customer service):
The directly heated thorium-tungsten cathode high u transistor 811 is used for high frequency oscillation power amplification. 811 is similar to 811A and can be used interchangeably.
Filament heating
Uf.......6.3 V
If.......4 A
Limit rating
Anode voltage 1250 V
Anode current 125 mA
Anode dissipation power 40W
Gate current 50mA
Operating frequency and anode voltage
When the working frequency is above 30MC, the anode working voltage and anode input power will be adjusted down according to the table below:
Working frequency (MC): 60 anode voltage and anode input power: 80%
Working frequency (MC): 80 anode voltage and anode input power: 70%
Operating frequency (MC): 100 anode voltage and anode input power: 55%
The reddish color is not allowed during continuous operation. When working intermittently, the anode can only have the reddish color just noticeable.
Interelectrode capacitance:
Input capacitance: 5.5 PF
Output capacitance: 0.6 PF
Cross-circuit capacitance: 5.5 PF
Static parameters:
Ua: 2000V
-Ug: 2V
Ia: 26mA
u (at 1a=20mA): 160
A-F power amplification or modulation
Class B amplification, gate excitation
CSS: continuous work
ICAS: Intermittent work