You will like to try 6N2P-EV bcs of its low leakage & microphony, and 6N8S FOTON or MELZ bcs of their being the Russian Sylvanias & Bendixes of yore.
I will try the 6n2p-ev tonight.
I don't know about the 6N8S - I don't know what factory my ones came from - there aren't any marks on the tubes, bar the "6H8C" and "8706". Maybe the "8706" is a date code june 1987?
On the base (phenolic) there is a diamond with a "0" and a triangle with a "1" in it. Getter is in a small cup at the bottom of the tube, and the plates are grey. Came in boxes like the ones shown here:
Fran
I don't know about the 6N8S - I don't know what factory my ones came from - there aren't any marks on the tubes, bar the "6H8C" and "8706". Maybe the "8706" is a date code june 1987?
On the base (phenolic) there is a diamond with a "0" and a triangle with a "1" in it. Getter is in a small cup at the bottom of the tube, and the plates are grey. Came in boxes like the ones shown here:
Fran
I tried out the 6n2p ev.....
I tried a pair in both positions, then one in each. None of that sounded nearly as good as the plain ones 6n2p from langrex on Ebay. The 6n2p ev are from the voshkod factory, date code 9203. The 6n2p are reflektor and have an unusual double mica spacer at the top of the tube. The first pic shows the 6n2p reflektor:
And this one is the 6n2p-ev voshkod:
It wasn't even a close thing - the bass was really muddy and much less clarity (and more likely to be sibilant) with the -ev valves. I'm surprised at this, because I've tried a bit of tube swapping over the years, and really its never made much difference. A friend has a valve output CDP though, and the type of 12au7 in that made a large difference.
Maybe I've just got a bad tube of course......
Fran
I tried a pair in both positions, then one in each. None of that sounded nearly as good as the plain ones 6n2p from langrex on Ebay. The 6n2p ev are from the voshkod factory, date code 9203. The 6n2p are reflektor and have an unusual double mica spacer at the top of the tube. The first pic shows the 6n2p reflektor:
An externally hosted image should be here but it was not working when we last tested it.
And this one is the 6n2p-ev voshkod:
An externally hosted image should be here but it was not working when we last tested it.
It wasn't even a close thing - the bass was really muddy and much less clarity (and more likely to be sibilant) with the -ev valves. I'm surprised at this, because I've tried a bit of tube swapping over the years, and really its never made much difference. A friend has a valve output CDP though, and the type of 12au7 in that made a large difference.
Maybe I've just got a bad tube of course......
Fran
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Its possible - I noticed with one of them that I thought the balance was off a little to one side. That may well be the cause.
I don't have a valve tester, but I suppose I'd be better measuring in circuit if needs be. I don't think its worth while however, as the ordinary 6N2P sound very very good.....
Fran
I don't have a valve tester, but I suppose I'd be better measuring in circuit if needs be. I don't think its worth while however, as the ordinary 6N2P sound very very good.....
Fran
I know K72 as Teflon. But as P-6 or -11. Can I see a pic of the K72y? I recommended the k72 0.047uF as inter-stage coupler and the FT-3 as a bypass to the main output coupler. They do combine very well with K75-10 hybrid green as main IMHO. But its worth a try to bypass whatever you got as output cap with the FT-3 anyway. There are enough types they marry well, some not of course. If you will find the K72 0.047uF objectionable, you can save the FT-3 for testing as inter-stage too, they have different signatures. Do ground their metal cans when used as inter-stage (both types).
Yes, sorry, my mistake, they are K72 P6. I also bought some MGBO types to try on the outputs. I've attached a few pics below. I used the MGBO on my pass ono to great effect, so thought it would be worth trying them on the outputs of the valve itch too. I bypassed them in the ono with some wima fkp, but on the pass forum Zen Mod recommended using some MKC for bypasses. So I have some of those as well.
So, first up will be the K72P-6 0.047uF for interstage. Then I'll try the MGBO with either FT-3 or MKC on the outputs. Of course all this is for a phonostage which is already top notch, so I do ask myself why am i even doing it!!?
Fran
So, first up will be the K72P-6 0.047uF for interstage. Then I'll try the MGBO with either FT-3 or MKC on the outputs. Of course all this is for a phonostage which is already top notch, so I do ask myself why am i even doing it!!?
Fran
Attachments
More listening comments later....
but first, I made a short video tonight of my TT. What might be of interest to you here is the audio. The recording was made using a Zoom H1 recorder, mounted on a tripod at ear height in my normal listening spot. The music is John Grant, the Two of Us, from a Mojo (magazine) release a while back of Beatles covers. This is the first track on the LP. So the set up you can see in the video, and of course, the phonostage is the Valve Itch!!
I hope it gives some idea of what it sounds like in my setup. Bear in mind, that you are hearing it through the recorders ears, then the audio processing of youttube etc.....
YouTube - Needle Drop.mp4
Fran
but first, I made a short video tonight of my TT. What might be of interest to you here is the audio. The recording was made using a Zoom H1 recorder, mounted on a tripod at ear height in my normal listening spot. The music is John Grant, the Two of Us, from a Mojo (magazine) release a while back of Beatles covers. This is the first track on the LP. So the set up you can see in the video, and of course, the phonostage is the Valve Itch!!
I hope it gives some idea of what it sounds like in my setup. Bear in mind, that you are hearing it through the recorders ears, then the audio processing of youttube etc.....
YouTube - Needle Drop.mp4
Fran
Nice video. But the audio level seems low on my PC. Can't you record directly off the preamp's output? I can hear the room reverberation.
Interstage teflons in place and they add clarity alright - not huge, but there. It doesn't seem to have affected the sound - and the soundstage is still there. I've only had 2 short listens since I put them in though.....
I find myself reluctant to change anything else....
I should add that the video was really a video learning exercise (see if i could sync up audio and video, edit clips etc etc). Also, theres a long running argument that quads can't do bass, and that low thump after the first verse helps dispel that myth a bit.
I'll wire it up, although honestly I don't know how it will sound as I only have the Zoom H1 on load and don't know how it performs on mic in.
Fran > bed!
I find myself reluctant to change anything else....
I should add that the video was really a video learning exercise (see if i could sync up audio and video, edit clips etc etc). Also, theres a long running argument that quads can't do bass, and that low thump after the first verse helps dispel that myth a bit.
I'll wire it up, although honestly I don't know how it will sound as I only have the Zoom H1 on load and don't know how it performs on mic in.
Fran > bed!