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6SN7 Tube Addicts

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  1. Wes S
    Glad it helped! Just to elaborate on the KenRad, it is a somewhat dark sounding tube overall, and as a result I would often turn up the volume, to get better dynamics and clarity, and that is when those peaks that come through in the upper mids/lower treble, would always cause fatigue after long listening sessions. The KR is really an interesting tube, in that it can sound dark, with the big bass and rolled off upper treble, and bright at the same time with the upper mids/lower treble peak. I am sure that in some applications this tube would be killer and that is why I kept my stash.
     
    cddc likes this.
  2. cddc
    It's indeed very interesting, dark sounding signature normally does not come with harsh lower highs. The HD650 as a good example of dark sounding headphones does not have any harshness in upper registries and is good for long listening sessions. Will see if I can have a listen to Kend-Rad and add it to my stash.
     
  3. Wes S
    I own a pair of HD 650 and agree.
     
    cddc likes this.
  4. Skylab Contributor
    I certainly preferred the RCA over the Ken-Rad, yes...but...

    Beyond a doubt.
     
    cddc likes this.
  5. cddc
    Are these Tung Sol 6SN7GTB tubes?

    Well, the print on base says Tung Sol, and the print on glass also looks like Tung Sol, however their flat ladder plates and side D-getters and micas are quite similar to GE 6SN7GTBs'.

    Most Tung Sol 6SN7GTB's I have seen come with T-plates, the flat ladder plates make me think they are likely rebranded GE's (or RCA's...)?

    Can any guru here confirm that Tung Sol 6SN7GTBs can have flat ladder plates, or the ones below are just rebranded non-Tung Sol 6SN7GTB tubes? @Skylab , @Xcalibur255 , @rosgr63, @whirlwind, @Oskari

    [​IMG]

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    [​IMG]
     
    Last edited: Jul 25, 2019
  6. ken6217
    I just purchased a pair of Mullard ECC32 tubes. I have always run 6SN7's and am not that familiar with the structure of the ECC32 tubes. In looking at the pair. they do not look the same. One tube has two red wires near the baee, and the other tube doesn't.

    Can someone comment on this and let me know what you think.

    Thanks in advance.

    IMG_2690.jpg IMG_2691.jpg
     
    Skylab likes this.
  7. leftside
    There are many different variations with these tubes. Getters, micas, spacers, black/brown bases, grey/black plates - and in your case black vs red wires. Any other differences? If it's just red vs black wires that are the differences, then you've got yourself a very similar pair of tubes (construction wise).
     
    cddc likes this.
  8. cddc
    I think what you saw were just 2 pairs of braided shield sleeves in different colors - one in red and one in black.
     
    Wes S likes this.
  9. Wes S
    That's what it looks like to me, as well.
     
    cddc likes this.
  10. ken6217
    Thanks for both replies. I didn't not notice the tube without the red wire had a black braided wire. So, both are the same except for the wire color.
     
  11. Ripper2860
    FYI -- CV181 and 6SN7 are not 100% inter-changeable. The CV-181 has a 50% higher heater current draw (.96) than 6SN7 (.6). If using these in a 6SN7-based amplifier, be sure to verify it has the ability to deliver the additional current w/o incident.
     
    cddc likes this.
  12. ken6217
    I'm aware. It says in the manual that ECC32 tubes are ok for my amp.
     
    Ripper2860 likes this.
  13. Robert Padgett
    "On average, the ECC32 / CV181 has a heater current that’s 350 milliamps higher than a 6SN7 tube – i.e. 600-mA versus 900-mA. The ECC32 has a slightly higher mu of 32 versus the 6SN7’s 20 and the ECC32 has a maximum plate voltage rating of 300-VDC while the 6SN7 has a higher maximum plate voltage rating of 450-VDC. On average, the plate resistance of the ECC32 at 14,000-ohms is twice that of the 6SN7’s 7,000-ohms, so it is not advisable to use high-capacitance interconnects / cables with ECC32 / CV181 vacuum tube equipped preamplifiers or it will result in a dark, murky sound. So the use of a Monster Cable M850i is out of the question." -- http://boneshifi.blogspot.com/2015/05/the-ecc32-cv181-most-musical.html
     
  14. LoryWiv
    Helpful to know, thanks @Ripper2860 . I think my Feliks-Audio Elise can't exceed ~ 6.5A for all tubes combined. Does the heater current draw also vary by brand and specific type of CV181? For example, it appears the PSVane CV 181Tdraws 0.6 if I am reading the specifications correctly.
     
  15. Ripper2860
    CV181s are all the same electrical specifications. Real CV181s are .96 heater current draw or they are either defective or not a CV181. Now where it gets confusing is with the folks at PSvane and Shu-guang -- they went and threw a monkey-wrench into the works by marketing a line of "CV181" tubes that are not CV181s . Their CV-181 series tubes are NOT CV-181s at all, but are actually 6SN7s with .6 heater current draw. Why their marketing department decided to do that is beyond me. Even Grant HiFi had to put out a disclaimer that the PSvane CV181s they sell are NOT CV181s but are actually 6SN7 tubes, due to concerns with heater current draw specs being different between the two.

    Hope this helps.
     
    Last edited: Aug 14, 2019
    Wes S likes this.
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