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Should I bother to put a fan on my T8-LN OTL power tubes?

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Posted on October 30, 2021 at 13:38:04
LtMandella
Audiophile

Posts: 1870
Location: CA
Joined: May 27, 2019
Will it extend the life of the EL-509 power tubes if I put a low speed fan towards them?

The top of the vented chassis is pretty hot- I can keep the back of my hand on the vents but it is not comfortable.




Don't wrestle with pigs. You both get dirty and the pig likes it.
Mark Twain

 

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RE: Should I bother to put a fan on my T8-LN OTL power tubes?, posted on October 30, 2021 at 14:59:46
6bq5
Audiophile

Posts: 3687
Location: SF Bay
Joined: August 16, 2001
Given that winter is coming, and I trust you have adequate space ABOVE the amp - you should be fine; however some small quiet fans can circulate the warm air and save on your heating bill.... ;-)
Happy Listening

 

RE: Should I bother to put a fan on my T8-LN OTL power tubes?, posted on October 30, 2021 at 15:47:40
LtMandella
Audiophile

Posts: 1870
Location: CA
Joined: May 27, 2019
yep nothing on top of the vented area. I found my fabric blade silent mini fan so will probably fire it up.

Lately I have been powering Elac DBR special edition (only 88DB) but the 20wpc T8 sounds beautiful with those speakers. Can't say my $3K Ref3A DeCapo I speakers sound noticably better...

The Elac's are plenty loud with only minimal volume setting on the GG preamp.
Don't wrestle with pigs. You both get dirty and the pig likes it.
Mark Twain

 

RE: Should I bother to put a fan on my T8-LN OTL power tubes?, posted on November 2, 2021 at 11:08:24
Bill Way
Audiophile

Posts: 1741
Location: Toms River NJ
Joined: May 28, 2012
Forced-air ventilation *always* helps. I use the (almost) silent fans designed for computer enclosures.

WW
"Put on your high heeled sneakers. Baby, we''re goin'' out tonight.

 

I decided to use this, posted on November 2, 2021 at 11:28:23
LtMandella
Audiophile

Posts: 1870
Location: CA
Joined: May 27, 2019




This fan is almost silent at the low speed settings. Don't know if the fabric fan "blades" help for that.

Would not be a bad idea to fit a muffin fan in the case; have to open it up again and see if practical. Would be an interesting project.

So far after ~20 years with the amp I have replaced the speaker binding posts, 4 630v caps, a couple of fuses, all 8 EL509 power tubes, and one of the 12AU7s. Not bad for 20 years of many hours per week listening (although the past couple years I have been in Vegas and use a QUAD 909 in the summer heat months).




Don't wrestle with pigs. You both get dirty and the pig likes it.
Mark Twain

 

Or..., posted on November 5, 2021 at 07:35:22
Lew
Audiophile

Posts: 10679
Location: Bethesda, Maryland
Joined: December 11, 2000
You could cut out a portion of the top of the chassis and install a whisper fan that directs air away from the tubes and up toward your ceiling. Or you could install a whisper fan at the rear of the chassis and direct the air toward your back wall. (I don't know the form factor of your chassis, so I have no idea which is feasible.) Either of those would be more effective than just blowing on the amplifier with an external fan, but even that will help, I guess.

 

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