Shuguang Treasure CV181-Z Lifespan in hours?

[ColinA]

What rubbish!
Tommy Flowers from the Post Office Research Station in the 1940 showed that valves were very reliable when run continuously.
The huge valve based computers like the Colossus were based on that principal!

 

[FullRangeMan]

How many hours was ''very reliable''?
How many hours Colossus tubes lasted?
Do you think Mr.Flowers was referring to Chinese commercial tubes made to audiophools?

 

[ColinA]

Reliable was a machine using up to 2,400 valves which had to keep working.
This was achieved by not switching them off.

The problem of Chinese valves in Chinese amps
with poor quality control and voltages all over the place is separate.

 

[FullRangeMan]

This kind of ''reliability'' may be so low as 500 hours per tube.

 

[petertub]

As an example of lifetime for tubes :
in my vta-70 ( a dynaco stereo70 clone) i installed an hours-meter when new. I also
installed 4 JJ 6550 tubes.
This amp now has been running 2700h and bias is still accurate .

 

[petertub]

Hour meter used in previous post :
Rectangle LCD Hour meter gauge 924-48-90 volt golf cart forklift 9-80VDC generic

All that is needed is a few mA DC , a diod from filament will do.

 

[rhythmsandy]

So, are you asking because you are thinking of buying some or because you have a problem with them not lasting?

I run eight of the Psvane CV181 TII tubes in my pimped Audio Innovations Second Audios. Ok, not the Shuguang Treasures but they are Chinese. Anyway I listen to them for about 8 hours per day for 5 days a week. They have been in the amps for about 3 months now and today I tested all 8 valves and they gave identical readings to the day they were installed. That's not many hours in the great scheme of things but it's all I can say so far.

So, come back and ask me the same question in a year or two . . . . . .

Oh, and they sound great.

so its 2 years from the time the question was raised so can you tell us how are the tubes working in your amp / preamp?

 

[Fourlegsgood]

so its 2 years from the time the question was raised so can you tell us how are the tubes working in your amp / preamp?

I ran them for a year with that daily use and there were no issues. Then I sold the amps but kept the tubes and used them in some 845 amps, again without problems.

 

[rhythmsandy]

I ran them for a year with that daily use and there were no issues. Then I sold the amps but kept the tubes and used them in some 845 amps, again without problems.

can you please tell me how many hours you have approximately used them?

 

[rhythmsandy]

So, are you asking because you are thinking of buying some or because you have a problem with them not lasting?

I run eight of the Psvane CV181 TII tubes in my pimped Audio Innovations Second Audios. Ok, not the Shuguang Treasures but they are Chinese. Anyway I listen to them for about 8 hours per day for 5 days a week. They have been in the amps for about 3 months now and today I tested all 8 valves and they gave identical readings to the day they were installed. That's not many hours in the great scheme of things but it's all I can say so far.

So, come back and ask me the same question in a year or two . . . . . .

Oh, and they sound great.

So its been over 3 years so may I know what is the update on the tubes. How are they functioning now. How many hours you might have run it.

 

[mondogenerator]

Reliable was a machine using up to 2,400 valves which had to keep working.
This was achieved by not switching them off.

The problem of Chinese valves in Chinese amps
with poor quality control and voltages all over the place is separate.

The problem with this statement about the Colossus is that is isnt tempered at all - no reference to how often a valve had to be switched out.

A quick tour of Bletchley Park will qualify that statement....

I.e. valves failed regularly, not due to unreliability per se, but due to sheer numbers.

I MTBF was 1000hrs in just 1% of tubes, then maintenance was an almost continuous exercise