best long life for my tube

jeapel · 4th May 2005, 04:08 PM

hi

In my amp i use 6vac -5% for the heaters and i was sure
in my mind to get the best long life for my tube but now
i read some thread saying -5% is the strict minimum and
now i m not sure .

my tubes are indirect heated triode:

6SN7 5ma ~25% of pa max.

6AS7 70ma ~60% of pa max.

i would like to get your opinions on my low 6vac and % of
pa max. for my tubes

thanks

Sch3mat1c · 4th May 2005, 07:56 PM

Pffbt. 10,000 hours minimum.

You do realize that you're practically running more heater than plate dissipation in the 'AS7? What a waste...

Tim

jeapel · 4th May 2005, 10:22 PM

hi Sch3mat1c

Pffbt. 10,000 hours minimum.

.......it s more or less than normal 6.3 vac tube life

You do realize that you're practically running more heater than plate dissipation in the 'AS7? What a waste...

.......i don t realize but you r right :-) but it s the only way
i found to get zout=50ohm with just 6db feedback
and the 6AS7 is not easy to drive to :-) but 6AS7 is
great tube to do special thing impossible with other
tube

4th May 2005, 04:08 PM	#1
jeapel diyAudio Member Join Date: Sep 2003 Location: quebec	best long life for my tube hi In my amp i use 6vac -5% for the heaters and i was sure in my mind to get the best long life for my tube but now i read some thread saying -5% is the strict minimum and now i m not sure . my tubes are indirect heated triode: 6SN7 5ma ~25% of pa max. 6AS7 70ma ~60% of pa max. i would like to get your opinions on my low 6vac and % of pa max. for my tubes thanks

4th May 2005, 07:56 PM	#2
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Pffbt. 10,000 hours minimum. You do realize that you're practically running more heater than plate dissipation in the 'AS7? What a waste... Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

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4th May 2005, 10:22 PM	#3
jeapel diyAudio Member Join Date: Sep 2003 Location: quebec	hi Sch3mat1c Pffbt. 10,000 hours minimum. .......it s more or less than normal 6.3 vac tube life You do realize that you're practically running more heater than plate dissipation in the 'AS7? What a waste... .......i don t realize but you r right :-) but it s the only way i found to get zout=50ohm with just 6db feedback and the 6AS7 is not easy to drive to :-) but 6AS7 is great tube to do special thing impossible with other tube

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