2. amps-preamps
  3. 192573-139717

DON:T WAIT! Replace Those Old Power Tubes!

For several years I've cobbled together the required quad of 6L6GC power tubes for my Raven Audio Integrated amp. I say 'cobbled' because out of two sets I culled four which would perform what I perceived as reasonably decent sounding. Being on the last best four I feared one more failing tube would put me out of the music. So, I ordered another quad from Raven Dave (Thomson). At first I thought to just saved them for an emergency but on a whim I decided to just put all the Chinese New Old Stock (NOS) in place. APPARENTLY, and obviously, my smorgasbord set in place previously had various quirks including but not limited to: hum, occasional buzzing, and a bloated`slow tone. My wife immediately stated: I don't hear anything in the background. Indeed there isn't anything but dead silence. NOS tubes are always a "Russian roulette" deal but their unique and amazing "real-ness" is worth the gamble. (IMO) So if you have been waiting until you absolutely have to, DON'T WAIT any longer. The improvement is profound. These tubes are as old as I am! Only difference is I've not been in a box traveling around the world for over 60 years! 

allears4u
harleyujoe's avatar
harleyujoe
52 posts
 

I used 90 degree ones on everything so wire weight did not put stress on connections..

buellrider97
396 posts
 

   “ Chinese NOS “ ? That’s a new one to me, but I don’t get out much. A tube tester is a must have. Not owning one, I utilize a neighbor that’s in the local radio club. As far as NOS , I prefer them for input, and rectifier positions. In regards to power tubes I have NOS, Current Production, and 1 set of higher quality Chinese. I find new production Gold Lion and Tungsol nice. But to your original statement, with power tubes being a wear item, putting in fresh tubes is almost always a realization of how worn your current ones are. The only tube failure I’ve had that actually caused damage was a brand new Gold Lion KT-77 that failed and damaged my amp. 

allears4u OP
147 posts
 

Yes a tube tester is on my short list of "important" items needed. Honestly that level of commitment was what I feared originally about tube equipment but despite myself I'm overcoming my xenophobia. The quality of musical reproduction  is so "human" that I'm getting braver and beginning to embrace the cool details of tube design and magical sound quality. I'm so techno-phobic that tubes seemed unnecessarily demanding. But, contrary to my stubborn comfort zone addiction, I've begun to embrace the additional knowledge set that tubes require. "Old dogs new tricks" adage rings true for me except gaining amazing music quality beyond anything I've ever thought I could own has lead me down a path which contained delights worth the uncomfortable feeling of uncertainty. Yes, Chinese NOS which, I'm reliably informed, far out performs current production models. Not cheap though at $400 per quad for Raven Heads through Raven Dave of Raven Audio but my ears have never experienced such a treat!!

 


 

oddiofyl's avatar
oddiofyl
3,922 posts
 

I agree with Elliott. I test all tubes before they go in my gear for shorts and Gm.   Even then it's no guarantee.  

I bought a tester and few years ago when I started playing with rectifiers and DHT tubes .  It wasn't cheap but it saved me from putting what was no question a bad  NOS tube in my amp.   I bought 6 of the same tube, same JAN box, lot # etc but there was a bad one in the mix.   

My failed tube count over the past 25 years is low but I wish I had a tester years ago.   It only makes sense if a number of components are tube, but it is valuable when you have a problem.  

harleyujoe's avatar
harleyujoe
52 posts
 

May I ask what tube testers you own and how accurate are they...

I know when Dave Thomson of Raven Audio sends me tubes they 

all are marked with the test all done on them...

All my tubes come from Dave for my Amp ..

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