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EZ 81 blown twice (Read 5801 times)
Lon
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Re: EZ 81 blown twice
Reply #15 - 05/05/12 at 12:41:19
 
H, Welcome to the forum! Glad you're enjoying your MT and Trapeziums. Keep the impressions coming!
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Rivieraranch
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Re: EZ 81 blown twice
Reply #16 - 05/05/12 at 14:39:59
 
Simply put, JJ quality BLOWS! Jim McShane wrote recently of a batch of JJ EL84's he received that were bad. The JJ EL84 was a very highly regarded tube. If they start mucking that up, do you think they are paying attention to quality control in their rectifiers? Hell no!

Jim McShane sells an RFT EZ81 that is a good bet. NOS US 6CA4 are available as well. If I am not mistaken you can also sub an EZ80 6V4 in there as well.
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Les Lammers
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Re: EZ 81 blown twice
Reply #17 - 05/05/12 at 15:01:58
 
Just get a pair of quality NOS or lightly used RFT, Valvo, Mullard, GE
etc. They will seve you well. Like Erik posted, if you are rolling tubes let the amp cool a bit before turning it back on...especially if you are using JJ EZ81's.
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roggae
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Re: EZ 81 blown twice
Reply #18 - 05/15/12 at 01:57:34
 
Blew another JJ. Different channel. Amp was idling. Put kids to bed. Came back. Tube was blown. What should I do?
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HPDJ
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Re: EZ 81 blown twice
Reply #19 - 05/15/12 at 02:07:09
 
which tube was it? The EZ81's?......as others here have mentioned, your best bet is to ditch the JJ's (my 6V6's work fine still in my MT though) and get a more reliable NOS one...you probly got some JJ"s from a bad batch or something...
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Fireblade
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Re: EZ 81 blown twice
Reply #20 - 05/15/12 at 03:17:12
 
If you still have that single survivor JJ tube that has not blown yet, it's definitely a bad lot.  Try to take this with the seller, if you can.  
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« Last Edit: 05/15/12 at 03:20:39 by Fireblade »  

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roggae
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Re: EZ 81 blown twice
Reply #21 - 05/17/12 at 15:51:37
 
Pulled the trigger on a pair of the RFT EZ 81s and I also picked up a pair of 6v6gt reissues since Steve mentioned my out put tubes might be shorting. Any thoughts?
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Les Lammers
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Re: EZ 81 blown twice
Reply #22 - 09/29/12 at 22:09:29
 
Rogge,

Were you using 6L6 types when the rectifier popped?

FB
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roggae
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Re: EZ 81 blown twice
Reply #23 - 10/15/12 at 01:33:43
 
I'm pretty sure it happened both with stock tubes in place and other approved NOS tubes. Why?
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Rivieraranch
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Re: EZ 81 blown twice
Reply #24 - 10/15/12 at 10:53:30
 
This is the main reason that the mass market migrated towards "solid state" in the 1960's. Tubes were somewhat unreliable. They can test fine but after a while sometimes a tube can go bad. Hopefully this won't happen to you again. With new power tubes and rectifiers, there is little chance that tubes will blow.
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Lon
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"Love without
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Philip K. D*ck

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Re: EZ 81 blown twice
Reply #25 - 10/15/12 at 13:34:33
 
Actually, I think the main reason that the industry moved to solid state was cost, transistors ultimately were easier to build, transport, and install all at a lower cost point. They could provide more power more easily, and it was easier to build powerful amps with inefficient speakers than lower powered amps with efficient speakers. Or so Ive read and been told by a few audio technicians.

What a shame really. . . Just think what fifty years of tube electronic development might have brought. And maybe we wouldn't have been hurled into this automated electronic nightmare we live in (or maybe just how I perceive it at times.) Smiley
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Les Lammers
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Re: EZ 81 blown twice
Reply #26 - 10/15/12 at 17:55:22
 
Lon,

The chicken or the egg? LP's & CD's?  Would Led Zep & ZZ Top have been the same with all tubes? The Japanese bought a lot of the old tube gear and tubes and sold us Pioneer and gave us perfect sound 4ever. Smiley
I just sold a Sansui AU222 20 watt integrated from 1964-65 it sounded  much like tubes and had a very good phono section. Actually, early SS was voiced to mimic tubes. The little amp was built like a tank. Industrial strength circuit boards etc. I wonder how it would stack up against a modern amp if it were fully restored?

Les

P.S. EZ80's sound great in the Mini. I got some Tungsrams and RFT's. They are not expensive tubes.
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« Last Edit: 10/15/12 at 18:00:10 by Les Lammers »  
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Lon
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"Love without
guts is
worthless!"
Philip K. D*ck

Posts: 7339
Re: EZ 81 blown twice
Reply #27 - 10/15/12 at 18:01:59
 
When I listened to Zep and ZZ. . .I listened on a tube system. Smiley  And those bands used tube amps.

The Japanese were smart to buy up that stuff. Most here didn't value them at the time.

I guess I blame transistors on miniturizing circuits and such things as smart phones and even the internet, both of which I begin to feel are polluting life and allowing the fabulously wealthy to . . . ah I'll just say I'm starting to be a bit of a luddite and enjoying my tubes.
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« Last Edit: 10/15/12 at 18:10:58 by Lon »  

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Les Lammers
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Re: EZ 81 blown twice
Reply #28 - 10/15/12 at 18:27:01
 
I'm getting old(er) too.  SS can sound very good but tubes do it for me.

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Lon
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"Love without
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worthless!"
Philip K. D*ck

Posts: 7339
Re: EZ 81 blown twice
Reply #29 - 10/15/12 at 19:11:49
 
I prefer to think that we're both getting . . . wiser. Smiley
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