How much time does your 300b last ?

[gillougillou]

Hello !

The question is in the title

Thank you

Gilles

 

[jazbo8]

http://www.diyaudio.com/forums/tubes-valves/161997-300b-tube-life.html?highlight=life+300B

 

[JonSnell Electronic]

'The life of the valve at maximum operating conditions will be shorter than the recommended conditions.'
See http://www.tubebooks.org/tubedata/we300a_b.pdf

 

[audiowize]

I've had a few Chinese 300Bs last less than a few months (Guiguang/Psvane), and I've listened to plenty of TJ/Sophia 300Bs with 10+ years of use on them that sounded OK. You do want to start measuring them periodically after about the ten year mark though if they have heavy use on them.

I serviced a pair of amps a couple of years ago with first generation TJ 2A3s in them that had finally worn out. I had a laugh at the amp owner, as he wanted to know if there was anything that could be done to resurrect the tubes. Obviously he'd gotten a ton of life out of them!

As far as Russian tubes go, I have had plenty of EH 300Bs in service, but I have yet to exhaust any of them.

 

[RajkoM]

Now I use the second pair of NOS =C= 300B in the last 17 years.
But always with Siemens variable main transformer for a very slow turn-on.