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300B Reliablity
300B Reliablity
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Old 30th June 2005, 11:07 AM   #1
rick57 is offline rick57
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Join Date: Dec 2002
Location: dry ol Melbourne Australia
Default 300B Reliablity

Iím soon to buy a quad of 300Bs

Research soon shows reliablity isnít as good as we would like, from popping sounds to tubes dying after only 6 months.

Iíve formed a picture of the relative SQ strengths & weaknesses.

What is your experience of the reliabity, partiucularly of the JJ?

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Old 30th June 2005, 01:37 PM   #2
kmtang is offline kmtang  Canada
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Location: Vancouver
I haven't had any problem with the 300B's at all. I have got the EH, ShuGuang, and TJ Full Music ones. None of them having relaibility issues so far.

I ran them with 450V B+, self biased with 940-ohm cathode resistor.

I believe if you are keeping the filament voltage within -5% to 0% at 5V, plate current less than 70mA and the B+ less than 430V, you shouldn't have too much problem with it.

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Old 30th June 2005, 03:01 PM   #3
jim is offline jim  Belgium
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Location: Leopoldsburg - Belgium

What is your experience of the reliabity, partiucularly of the JJ?
Have them running in my SE amp for about 1,5 year.
No problem at all !

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