Early tube mortality

[6p5p]

Re: Early tube mortality

I don't remember, but I might have it written down somewhere. I remember it took a little while to stabilize after I took the amp out of standby, so I let it do that before I tried to do anything with it. I remember the Eurotubes meter got the same result as their probe used with my DVM.

Was it an EL84? If yes, 34mA would match a plate with extremely low voltage (200VDC). If the plate voltage was higher, too hot biasing was the case.

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[Little Pigbacon]

Re: Early tube mortality

They're EL34's. It's a JVM 410H.

 

[Joey Voltage]

Re: Early tube mortality

They're EL34's. It's a JVM 410H.

That's about on point.

 

[Scott_F]

Early tube mortality

When I bought my blonde Mark III 112 EVM combo, I re-tubed it with a set from www.thetubestore.com. It really sounded great.

A couple days later, I take it down to a local bar for a weeknight blues-rock jam session, hosted by some of the area's top musicians. First song, no problems. Second song, I launch into "Black Magic Woman" and about half-way thru the opening solo, the amp starts making funny noises. I'm trying to sing, and the amp is going, 'woo-AH-EEEEEeee-ooo-OOOWWWWeee". Making Yoko Ono noises, even with my guitar off. I finally reach down and shut it off. Half the audience is going, "WTF?!", and giving me rude looks, and the coked out musicians are going, "Man! What a cool effect pedal!"

I was just SO embarrassed! And being new in town, it did NOT help establish my reputation as a great singer/guitarist/songwriter!

After slinking home with my tail between my legs, discovered that the Brand new E-H 12AX7 in V1 had shorted. Tubestore was great and sent me a replacement ASAP, no problem, with apologies.

It does happen. I carry spare tubes to a gig, and have for years. But at a jam where you only get to do two or three songs...S-C-R-E-W-E-D!

It does happen. I feel your buddy's pain, believe me. All you can do is buy good tubes from a reputable vendor who will back them with a solid warranty.

Oh...and I never went back to that jam, LOL! When I did decide to go back, they'd gone out of business!

IT'S NOT MY FAULT!!!! (LOL!)

Bill

Was listening to Double Fantasy and kept skipping forward a track to not have to listen to Yoko cat in heat crap.

I was listening to an interview from John's producer where Yoko had visited the producer and handed a cassette tape with the demos for Double Fantasy with John saying he wasn't sure if they were anything but crap. As the producer turned to leave, yoko handed him numerous reel to reel tapes with all her stuff on it saying she was going to be on the record too. Sad.

Oh well, yeah tubes go bad normally quickly. I question if the burn in 24 hours thing is real. Probably just marketing.

Guys like TAD supposedly cull their tubes before relabeling them. I've yet to have a TAD go bad on me. You will pay a few dollars more. Carry some spares is obviously great advice.

 

[Little Pigbacon]

Re: Early tube mortality

Oh well, yeah tubes go bad normally quickly. I question if the burn in 24 hours thing is real. Probably just marketing.

Depends on what the reliability curves look like.