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EZ81 is broke, what to get?? (Read 1738 times)
jorgen
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EZ81 is broke, what to get??
07/20/14 at 06:04:02
 
Hi all
Ive had my MT for 6 months now and last night the ez 81 tube went down, did a little research to make sure thats the one tube, but I am sure. This is the same tube that was giving me a little trouble earlier, some high pitch bi-sound, coming from the amp itself, didnt affect sound, so Im just hoping it was an issue with this particular tube, and that my amp doesnt need new tubes every 6 months of use. .  .

Looking for a replacement, but this is an area of expertise where I DO NOT excel... What are my alternatives? What do I have to expect to pay for these tubes? And how do they sound?


To be honest, I would appreciate a clear message, get this tube from that site, pay this much! Tomorrow I leave for a two week vacation, and would really like to have them by the time I get back.

really nice of you guys to help out.
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« Last Edit: 07/20/14 at 06:05:55 by jorgen »  
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grinnell
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Re: EZ81 is broke, what to get??
Reply #1 - 07/20/14 at 07:18:45
 
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MT w/ 1940's RCA 6v6g st
Ref 3A de Capos
VPI HW-19 mk iv
Mac Tuna MR-67
MH 25.2 CDP
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jorgen
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Posts: 80
Re: EZ81 is broke, what to get??
Reply #2 - 07/20/14 at 07:32:26
 
went to the tubes store, and figured i shoud try some options:

ended up with:
tesla 6ca4/ez81

Mullard 12 au7 reissue¨

jan-ge6x4wa, can I use this one??

Electro-harmonix 6ca4/ez81

genalex gold lion 6v6gt/cv511


I have no idea what these tubes will be like. but figured I should try some different ones, so now i have something to look forward to when i get home aswell. Hope i have undertood everything correctly and that i can use all of these tubes. for once I understand the excitement of shopping...
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grinnell
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Re: EZ81 is broke, what to get??
Reply #3 - 07/20/14 at 17:13:44
 
if your mini is the second version of the first one modified and uses EZ81 you can NOT use jan-ge6x4wa, the 6X4 is 7pin the EZ81/6CA4 is a 9pin tube
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MT w/ 1940's RCA 6v6g st
Ref 3A de Capos
VPI HW-19 mk iv
Mac Tuna MR-67
MH 25.2 CDP
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Fireblade
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Knowledge comes, but
wisdom lingers.
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Posts: 835
Re: EZ81 is broke, what to get??
Reply #4 - 07/20/14 at 18:28:29
 
I also had the stock EZ81 (left channel) blow off at about 4 months of use. Replaced it with both RFT EZ81 and RFT EZ80. Both sound fine, but I personally prefer the EZ80 spec sound. RFT's are reliable, great quality and affordable. My RFT EZ80's have been on for over a year now!
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« Last Edit: 07/20/14 at 18:29:25 by Fireblade »  

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jorgen
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Posts: 80
Re: EZ81 is broke, what to get??
Reply #5 - 07/20/14 at 20:45:42
 
Grinnel: thanks I wasn't aware and did no know this, will contact tubestore and change my order. But I can use both the ez 81 ez 80 and ez 90?
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« Last Edit: 07/20/14 at 21:51:52 by jorgen »  
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grinnell
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Posts: 74
Re: EZ81 is broke, what to get??
Reply #6 - 07/21/14 at 14:04:09
 
I don't think so the EZ90 is a variant of 6x4.  If you have the version that uses the EZ81 you can't, check with Decware.

I'm not sure about the ez80 that seems to be a 6v4 variant
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MT w/ 1940's RCA 6v6g st
Ref 3A de Capos
VPI HW-19 mk iv
Mac Tuna MR-67
MH 25.2 CDP
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jorgen
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Posts: 80
Re: EZ81 is broke, what to get??
Reply #7 - 07/22/14 at 00:36:57
 
Hi guys
Got to say kudos to the tubestore, they changed.my order no question asked, added an ez80, not sure what kind. So when I return from my vacation I can expect a package with some different tubes. Guess I have some experiments to do this autumn!

Contemplating to get some different versions of the 6L6/6V6 as described by decwareand even OA3(?) tubes. This might be an costly hobby....but hey, nice aswell
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« Last Edit: 07/22/14 at 10:02:12 by jorgen »  
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grinnell
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Posts: 74
Re: EZ81 is broke, what to get??
Reply #8 - 07/22/14 at 14:43:41
 
VR OA3/OA2 and OA2/OB2 type tubes are cheap.  good tube rolling

6v6g ST  not cheap but some great tubes out there
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MT w/ 1940's RCA 6v6g st
Ref 3A de Capos
VPI HW-19 mk iv
Mac Tuna MR-67
MH 25.2 CDP
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jorgen
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Posts: 80
Re: EZ81 is broke, what to get??
Reply #9 - 08/11/14 at 10:39:33
 
Hi guys
Got bac k from vacation and did my first tuberolling over the weekend. Tried out a EZ 80 instead of the standard EZ 81, but at the same time rolled the 6v6 standard with a Gold Lion (see above). Played a lot of music that im familiar with, and wow, subtle but very interesing change in sound character. In my ears the EZ 80 is a little more "raw", i do believe I got a little more in the low end, not sure if i lost any in the highs. Need to learn a whole lot more on how to listen. AND those new tubes needs a few hours I guess before I can decide how they sound.

My problem though is that im not familiar with tubes and how they work, and which tube does what... So if anyone has a "Tuberolling for dummies"-link...

Can I ask: what would happen if I went from 12au7 and tried 12ax7 or a 12at7?

And does anyone tried with luck to use a 6L6 or 6K6, as in what are the main differences in these kind of tubes.
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Les Lammers
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Re: EZ81 is broke, what to get??
Reply #10 - 01/18/15 at 12:44:12
 
Jorgen,

Try the RFT EZ80. It is excellent in the Mini. The GL 6V6 takes a long time to settle in. Be patient. Don't go crazy rolling tubes.  ;)
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Rivieraranch
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Re: EZ81 is broke, what to get??
Reply #11 - 01/19/15 at 00:51:24
 
A 12AX7 would present too much gain.
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jorgen
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Re: EZ81 is broke, what to get??
Reply #12 - 01/19/15 at 11:37:06
 
RR:
I have tried a very good pair of 12ax7, and that (too much gain) seemed to be the result, I only turned my volume to 8 on the clock or so and i it seemed to play with a lot more SPL than with 12au7, i just replaced them with the standard tube, the pairs im using is a very good telefunken NOS and Mullard NOS, payed a lot for those but i do think i like them for the price. (maybe 200USD for the pair).
With to much gain, that would only give distortion earlier right? i would not get more spl? Or do i get a little more SPL but could damage the output tubes/ reduce expected lifetime of the tube?

I have some alternative choices for all tubes at the moment, about to to pull the trigger on some nice Marconi tubes (6F6) i think, but also want a really good pair of an 6v6 variant. I do believe I have tubes for 10-15 years to come, maybe more.
maybe i should try out a pair of 12at7, those have the least gain of three?
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« Last Edit: 01/19/15 at 11:41:33 by jorgen »  
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Rivieraranch
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Re: EZ81 is broke, what to get??
Reply #13 - 01/19/15 at 14:28:42
 
A 12AT7 presents a rational mid point between the 12AU7 and 12AX7. I had a Mini so I know what I am writing about.

When I first saw the Mini on the website I decided that I had to have it. I bought the prototype, #003, which was the first one built with EX transformers. It had a painted top plate and I recall that it sounded wonderful. I sold that one and bought a regular production model with a white top.

The problem that the Mini presents is that there are so many tube choices that you could literally lose your mind. My experience with the 6x4 rectifier blowing made Steve switch to the EZ81 6CA4 rectifier instead of the 6X4. I used some RFT EZ81 rectifiers with a 7-pin to 9-pin adapter.

I found that some of the 12AU7 variants such as the 5814 and 6189 did better than the regular 12AU7. Also that the 12AT7 was workable in the input position.
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TORII MK IV; TABOO MK III; SE84CKC; HR-1; TRAPEZIUM DESKTOP SPEAKERS; TECHNICS SL1200MK5 TT; Ah! Njoe Tjoeb CD player; MARANTZ 2226B; SENNHEISER HD-580 headphones
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Les Lammers
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Posts: 143
Re: EZ81 is broke, what to get??
Reply #14 - 01/19/15 at 16:51:51
 
I have some alternative choices for all tubes at the moment, about to to pull the trigger on some nice Marconi tubes (6F6) i think, but also want a really good pair of an 6v6 variant. I do believe I have tubes for 10-15 years to come, maybe more. maybe i should try out a pair of 12at7, those have the least gain of three?

Hi Jorgen,

The Mini is first and foremost a 6V6 amp. I would not spend a lot on the Marconi's or other varients. I tried a lot of different tubes in mine and 6V6's sound 'right'. As RR said don't go wild rolling tubes or you will go nuts. The gain of the 12AT7 is in the middle of the 12AU7 and 12AX7 and is a good choice in the Mini. The black glass Russian and Shuguang 6V6's are a nice tubes and not expensive. Mullard 12AT7/CV4024 are good and priced reasonably.

Les
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