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Post by mossback on Mar 22, 2008 15:30:22 GMT 7
Dear Joki and James, I like the JJ KT77 tubes, not to take away from your opinion Joki. However they have had quality problems, the pair I owned sounded very good in an Eico HF60 and the Dynaco MK IV amps James now owns. One of the four tubes had an envelope not perpendicular to its base. I have compared the JJ KT77 to my old Mullard, Telefunken, TESLA and older Winged SED EL34 tubes. IMO they more or less in the same ball park.
I emailed Jim McShane about the new KT77 tubes and will report back here what his opinion is. Perhaps this would be a good tube for your MK IV’s James? I have held off ordering what we talked about until Jim gets back to me if you don't mind.
I set the bias on those JJ's to ~60mA on the MK IV's and got good sound James. There are some other (stock) items replaced inside the amp making them safer to use. For one thing the bias resistors are new frankly I forgot what all i have done...Regards Dan
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joki
New Member
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Post by joki on Mar 22, 2008 20:07:10 GMT 7
James, I am still using the stock EL34 tubes that comes with the BS amp - EH which is not a good sounding tubes at all by comparison. And with the changing of 6SL7 to Mullard ECC35 and 6SN7 to Mullard ECC31, I could live with Electro Harmonix EL34 happily. Soon, I will replace it with Tesla EL34 which is a fairly good sounding tubes. I have a quad set of Mullard XF2 NOS and may also get them ready on my BS.
The best sounding has to be my Gold Lion KT77, even with a pair that is weak in reading, they sounded just so good.
I have a Quad set XF1 waiting for to collect from Singapore, I will let you know how they sound once I tried them.
Cheers, Jo
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joki
New Member
Posts: 15
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Post by joki on Mar 22, 2008 20:25:29 GMT 7
Dear Dan,
Not at all Dan, I stand to be corrected and my experience with JJ KT77 was only once and that could be an isolated case.
I compared it with Mullard tubes and back to back swap thereafter I found there is edginess and hardness especially in the midrange and high frequency that didn't quite sound as appealing to me. It is far from the experience I have against my Gold Lion KT77 which just make me stop dissecting the music. What comes through was to listen to the "totality" of the music which is presented in a coherent manner. It also made me stopped analysing the sound.
May be I shouldn't expecting them to be as good as the real KT77. But comparing it to Mullard was not on my cart at that time. So you could be more correct in your findings.
Regards, Jo
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Post by splendor on Mar 23, 2008 5:19:43 GMT 7
Thanks for all the "notes" on the el34 types. The EH 34s to my recollection were quite good Jo when I heard them the first time on my TS34.1 integrated. This is the asian version of the Norh SE9 which amp I still keep and use for my Dynaco A25 speakers. Not too many watts since it's SE but in a small room for most of the music I listen to, it's very pleasing. But they're now on Svets. So I really look forward to having any of these tube brands once Dan gets some additional facts from McShane about which way to go for. Thanks to the both of you.
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Post by splendor on Mar 23, 2008 9:50:42 GMT 7
By the way, the RCA 7199s sound tamer and more composed than the Sylvanias Dan. I thought it an improvement of sorts like what Jo did as well. Well, we've just been so used to tube rolling anyway that it's almost second nature that we do it as a tone corrective measure of sorts to our hearing anyway rather than discarding anything completely anyway.
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aaa11
Full Member
Posts: 101
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Post by aaa11 on Sept 13, 2008 8:12:11 GMT 7
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