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  1. #61

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    I had to go out right after I posted, but I will around most of the nite
    KC

  2. #62
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    After putting 50 hours on a pair of Tung-Sol 6AK5s, here are my observations of that tube vs the stock, Chinese 6J1s in my HiFiMAN EF2A headphone amplifier:

    6J1s are a little louder
    6AK5s are over all a little more smooth
    6J1s have a little higher background noise
    6AK5s run physically cooler
    6J1s sound a little more dry
    6AK5s have better mid-range
    6J1s are taller
    6AK5s are overall more musical sounding

    The 6AK5 is a very enjoyable tube that helped bring out the music in my headphone amp and it probably 15% better than the stock 6J1 tubes.
    Last edited by zingo; 03-09-2010 at 12:25 AM.

  3. #63

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    thanks Jake for your input, were you using just your headphones, or did you figure out a way to try it through your speakers?

    Now we need to get some black plate RCA to compare :D

  4. #64

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    On that note... i don't think i like the CV4010s anymore. I just can't get over the boost in highs. Guess i need to start shopping again.
    I don't read the newsssspaperssss because dey aaaallllllllll...... have ugly print.

  5. #65
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    That amp has no outputs except headphones, so I was using the Audio-Technica ATh-AD700s. I can redo that test if you want in two weeks when a pair of AKG K702s fully burn-in.

  6. #66
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    I may finally be buying decent tubes for my headphone amp after I returned KC's demo tubes and put the stock Chinese ones back in. I'm definitely eyeing Tung-Sol and GE tubes, but have any of you listened to Sylvania? I haven't heard much about them in any tube talk.

    I've been focusing more on another amp lately. I recently swapped Chinese stock driver tubes out for a Telefunken Mazda 12AT7 and a matched pair of GE 6FQ7/6CG7. Even leaving the quad of Shuguang EL34s, the amp is sounding amazingly better.
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  7. #67
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    Well, I finally got lucky on ebay and got a pair of NOS Hyton 6AK5s, that come with a spare GE.

    Upon doing some research I found this:

    CBS Hytron was a very high quality USA tube manufacturer. Their production numbers were much smaller than the big name brands (RCA, Sylvania, GE).

    Out of the individual tube reviews I was able to find online they appear to be a quality made tube with a great sound, if you can find them. I'm assuming that since they aren't one of the popular audiophile tube companies, and the fact that the company all together was lost in antiquity, they are less expensive even if they do sound good.

  8. #68

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    I have 2 pairs of the very rare 7728 gold pin's that can sub for 12AT7's and they are a very nice sounding tube. I believe CBS had them manufactured for them, I don;t believe they had their own manufacturing facility, but I could be wrong it's been awhile since I did the research on CBS tubes.

    Nice find

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  9. #69
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    I can't wait to get the tubes in, burn them in, then give them a quality A/B verses the stock Chinese tubes. I enjoyed using the Tung-Sols in my amp, and I'm hoping the Hytrons should wake-up the amp nicely.

  10. #70
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    Quote Originally Posted by heiney9 View Post
    I have 2 pairs of the very rare 7728 gold pin's that can sub for 12AT7's and they are a very nice sounding tube.
    Are you willing to part with any of those? :p

  11. #71

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    Quote Originally Posted by zingo View Post
    Are you willing to part with any of those? :p
    I had 3 pairs and sold a pair to Keiko. Perhaps, let me think about it and take a full tube inventory :).

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  12. #72
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    Just got my pair of NOS Hyton 6AK5 in the mail (with a spare GE :D). I'm going to start them with 50 hours of break-in, then A/B them against the stock Chinese 6J1 tubes.

  13. #73
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  14. #74
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    Initial burn in of new tubes completed and will post listening notes between the stock 6J1 tubes and the new NOS 6AK5 tubes tonight.

  15. #75

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    I'll be interested in hearing how they sound compared to the TS's.

  16. #76
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    First observations about the Hytron 6AK5 vs Chinese 6J1 is the Hytrons running brighter, but cooler to the touch. They are also a physically shorter tube, and I have no idea when my NOS tubes were made...

    As far as the sound, I think they are only a little better than the stock 6J1 tubes. The Hytron 6AK5s seem to have a little more life and less fatigue, and slightly higher gain. The 6J1s have slightly more noise, and might sound a tad flatter.

    There is a difference between the two tubes, with the winner going to the Hytron 6AK5, but not by as much as the Tung-Sols that I demoed earlier. However, I also pair $1 per tube for them, so I have no complaints about them as that is a pretty good value for the investment. :p I would try Hytron tubes again in a different application as they seem to sound neutral and balanced, while still tubey without over emphasizing anything. A decent tube with good bass that can be a good value.

  17. #77

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    Were those CBS Hytron tubes as in were they for broadcast consoles? They look different than the 7728's I have which are CBS and they are much different sounding that regular 12At7's.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  18. #78
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    Hyton was its own tube manufacturing company which was bought by CBS in the 50's to compete with RCA. Once CBS made the buy, I continued to manufacture many different TV and radio tubes.

    The tubes I bought are 6AK5s, and Hytron made everything from 6V6s to 5U4Gs. They are relatively cheap on eBay, and a cool part of Americana IMO.

  19. #79

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    So what is the best tubes that the three of you have tried so far seem to be?

    REGARDS SNOW
    Well, I just pulled off the impossible by doing a double-blind comparison all by myself, purely by virtue of the fact that I completely and stupidly forgot what I did last. I guess that getting old does have its advantages after all :D

  20. #80
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    The NOS Tung-Sol 6AK5s sounded the best, but the NOS Hytons were close behind them in SQ and cheaper. :D

  21. #81

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    Have some GE 6AK5's if you wish to experiment, cheap too..using Mullard's in my buffer and they sound great to me :)
    Computer room

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    Jolida JD1501 Integrated Amp

    H/T

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  22. #82

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    Quote Originally Posted by starkiller View Post
    Have some GE 6AK5's if you wish to experiment, cheap too..using Mullard's in my buffer and they sound great to me :)
    Thanks for the offer :) I have a fellow sending me some GE 6AK5's today allready good to hear that the Mullards are working well for you.



    REGARDS SNOW
    Well, I just pulled off the impossible by doing a double-blind comparison all by myself, purely by virtue of the fact that I completely and stupidly forgot what I did last. I guess that getting old does have its advantages after all :D

  23. #83

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    Cool...got the Mullard's from the UK and they do sound nice...good luck! Have of a pair of the GE's for backup use :)
    Computer room

    Rega RP1 w/Performance Pack
    Vienna Acoustics Bach Classic
    Magnavox CDB650 transport
    Modded MSB DAC
    Pioneer F-91 Tuner
    Lounge Audio MM phono preamp w/LCR RIAA Correction
    Jolida JD1501 Integrated Amp

    H/T

    Samsung Plasma
    Outlaw 950 pre/pro
    Tannoy Saturn 8's
    Hsu sub
    Emotiva UPA-500 5-channel amp
    Adcom GCD-600
    Philips 312
    Battery powered phono pre


    Garage

    Jennings Research Square
    Custom tube preamp
    Amherst A-1000
    Philips 935
    Modded MSB Link DAC

  24. #84

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    Quote Originally Posted by starkiller View Post
    Cool...got the Mullard's from the UK and they do sound nice...good luck! Have of a pair of the GE's for backup use :)
    hmmm..got a link?

  25. #85

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    Hmm, this was a while ago..will have to look it up, guy's name is michael and I believe that's the name of his store also...
    Computer room

    Rega RP1 w/Performance Pack
    Vienna Acoustics Bach Classic
    Magnavox CDB650 transport
    Modded MSB DAC
    Pioneer F-91 Tuner
    Lounge Audio MM phono preamp w/LCR RIAA Correction
    Jolida JD1501 Integrated Amp

    H/T

    Samsung Plasma
    Outlaw 950 pre/pro
    Tannoy Saturn 8's
    Hsu sub
    Emotiva UPA-500 5-channel amp
    Adcom GCD-600
    Philips 312
    Battery powered phono pre


    Garage

    Jennings Research Square
    Custom tube preamp
    Amherst A-1000
    Philips 935
    Modded MSB Link DAC

  26. #86

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    Bored tonight, was just browsing fleabay and found these. Not a bad price, but I made an offer for 7.00 apiece. Been running the Mullard M8100s in the Yaqin almost as long as it's been in my rig. Getting that itch to roll again so why not. 14.00 bucks won't break the bank, yet.

    http://cgi.ebay.com/ws/eBayISAPI.dll...:B:BOC:US:1123

  27. #87

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    I had a pair of the Siemens 6AK5W back when I had a couple of B283 tube buffers in the system several configurations ago. They were a very linear sounding tube with no emphasis on any one part of the musical spectrum (like most German made tubes I have tried). I preferred the lusher mid-range from the Mullard 8100, but that was me in my system. They may be the cat's meow in your system. I'll be curious to see what you think about them. Hard to go wrong with them at that price.

  28. #88

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    The seller accepted my best offer, so I'll let ya know how they work in my rig.

  29. #89

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    Just snagged a 5pack of these. Supposed to be on par with the Mullard M8100. Gonna give them a try also.

    http://www.ebay.com/itm/160832184700...84.m1497.l2649

  30. #90

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    Cool. That's a great deal! I'm curious to hear what you think of them compared to the Siemens and the Mullards. I couple of buddies have the B283, so it would be cool to give them a comparison.

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