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6SN7 Tube Addicts - Page 220

post #3286 of 4253
Quote:
Originally Posted by mrAdrian View Post

take a video of it.

Wtf! 

 

http://www.head-fi.org/t/654213/gold-lion-reissue-el84-tubes-arcing#post_9231889

post #3287 of 4253
Thread Starter 
Quote:
Originally Posted by Xcalibur255 View Post

Are your DT880's the 600ohm version Stavros?  I've been wondering how great the GR amps sound when used with the types of headphones they are best suited for.

 

I am using the 250Ohm version.

The Maestro GMP400 sounds very good, but haven't spent too long with them, mainly using the Grado for tube evaluation.

 

Quote:
Originally Posted by DefQon View Post

What should one do if a tube is arcing during warm-up?

 

When a power tube arcs you can damage your headphones.

I suggest you get your tubes tested just in case.

post #3288 of 4253


If you are certain what you are seeing is arcing take them out of the amp and stop using them.  There is the question of whether the tube is malfunctioning due to a defect or if it is being run at an inappropriate operating point by the circuit it is in, but either way when a tube arcs it is unsafe and can cause damage to the amp, headphones or both.

post #3289 of 4253

That is right, a tube tester can not tell if a tube is going to arc over. Most tube testers can not test the tube at the same operating point being used in the amp. You need to take the tube out of service as least for that amp. I had a tube that arc over that did blew out a headphone.  

post #3290 of 4253
Thread Starter 

That's right John.

 

A tube tester may not pick up the problem indeed.

 

I tested a rectifier with one of the best shorts/leakage testers a Sencore TC28 which didn't reveal any problems.

 

In circuit it arced after 10mins but I was lucky and my amp didn't sustain any damage.

post #3291 of 4253

Yup, I had an amp (Wheatfield Audio) arc a 5998 output tube, and it blew the drivers in my DT990.  Good thing they were not on my head at the time, or my hearing would have been permanently damaged as well. It's not to be messed with.

post #3292 of 4253
Thread Starter 

The first time it happened it was a quad of untested TS 5998 from a "reputable" ebay seller.

That was a few years ago.

 

The second time it was a 5U8C rectifier in my Glenn OTL.

The amp coped very well, I was very lucky.

post #3293 of 4253

And why do we love tubes???? confused_face_2.gif

post #3294 of 4253
Thread Starter 

Sometimes I wonder David.........

 

If you discover why please tell, maybe then we can find a cure!!!!!!!!

post #3295 of 4253

For some of us, isn't lack of funds suppose to provide prevention?

popcorn.gif

post #3296 of 4253
Quote:
Originally Posted by dminches View Post

And why do we love tubes???? confused_face_2.gif

 

Sometimes one does have to wonder ;)  But I know you know the answer...for many if not most who regularly read this thread, it's the combination of that certain something they provide sonically, along with the mystery/history that collecting them involves...

post #3297 of 4253
Thread Starter 

Rob, is that Love or Lust?

post #3298 of 4253

Like any great relationship it involves elements of both ;)

post #3299 of 4253

Rob, well said.

post #3300 of 4253

Stavros, you should hop on an airplane and meet us in Chicago for the Axpona audio show.

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