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6SN7 Tube Addicts - Page 248

post #3706 of 4483
Thread Starter 

David, are they yours?

You gave me a heart attack.

 

Here they are:

 

 

post #3707 of 4483
No!

I wish they were.
post #3708 of 4483

hey guys. my dark voice 336se finally came in and i turned it on. is it normal for 6as7 and 6sn7 tube glasses to turn dark grey from the bottom? i immediately turned it off after i noticed parts of the bottom glass was turning dark grey while listening to my music. i want to know if this is normal behavior for new tubes. these are the stock tubes that came with it.

 

i also smelled what seemed to be like a faint burn smell when i put my nose close to the tubes. once again normal behavior for new tubes? should i expect the same for the vintage tubes i ordered off ebay?

 

a picture of a better visual of what i'm talking about. the glass was crystal clear and after 4 minutes of turning on it started turning dark grey from the bottom up.

 


Edited by doco - 8/31/13 at 9:55pm
post #3709 of 4483
Thread Starter 

Are you referring to the shinny parts as shown?

 

 

post #3710 of 4483

yes.

post #3711 of 4483
Thread Starter 

What you see is the getter.

 

To me it looks nice and shiny the way it's supposed to be.

 

I can't say about burn smells, sorry.

Can you have the tubes checked on a tester?

post #3712 of 4483

i don't have a tube tester laying around. im thinking that's how the stock tubes are supposed to be. i put in some other tubes and the glass doesn't turn dark grey.

post #3713 of 4483
Forgot I kept these when I sold my WA6 a few years back. They sound really sweet in the HP-8....




Edited by SpudHarris - 9/1/13 at 12:05pm
post #3714 of 4483

Hmm I just grabbed these for 10 quids each pair- good deal?

 

 

 

On an unrelated note, seller also had another pair of Raytheon, but he wants 4x the price for it - are they really that better?

 

 

 

I think I saw lots of "Raytheon"  - some also have brown base like some Sylvanias instead of Black base. If I want a Raytheon in my collection - which would be the best to get?

post #3715 of 4483

Yup, you did good.  I have a pair of the ones in the bottom photos, very nice tubes.  What is the seller asking?  They command a fairly high price now if they are a good pair but I think people are overpaying for them personally.  The ladder plate Raytheons are the ones to have though, their T-plate tubes are nothing special.

post #3716 of 4483

40 Euro, but I didn't grab it - think they're gone now. Any picture of the ladder plate raytheon - is this it?

 

 

 

We've established that the CBS and Hytron black T-plate are the same, how does the short bottle CBS fall into the picture - haven't seen anything written about them

 

 

Also xcarlibur, have you tried the Ken-rad black glass in your Icon? I kinda want a pair but your previous comment on this thread scares me off (spotty treble) =p.

post #3717 of 4483

Hi guys, I need some help identifying some tubes I found in the closet. They are marked as Sylvania 6SN7 GTB. Trying to clear out some of my old gear and I'm wondering what these are worth? Also have a bunch of these GE 6SN7GTB tubes. These all have about 150 hours on them, were included with my last tube amp.

 

 

 


Edited by pne - 9/4/13 at 12:36pm
post #3718 of 4483
Quote:
Originally Posted by khaine1711 View Post
 

40 Euro, but I didn't grab it - think they're gone now. Any picture of the ladder plate raytheon - is this it?

 

 

 

We've established that the CBS and Hytron black T-plate are the same, how does the short bottle CBS fall into the picture - haven't seen anything written about them

 

 

Also xcarlibur, have you tried the Ken-rad black glass in your Icon? I kinda want a pair but your previous comment on this thread scares me off (spotty treble) =p.

Yes, that is what we mean by ladder plate.  The last two photos in your previous post also are ladder plate tubes.  The GTB CBS tubes in the last photo are rebranded GE tubes.  Nothing special, don't pay very much for them.  It's hard to tell in that particular photo but if they have the exposed filament wire on top then don't buy them at all those tubes don't sound very good.

 

I only own the black glass KenRad as a single tube, not a pair so I can't check them in the Icon.  It sounds nice in my OTL.  They have a reputation for lacking air up top and being a little congested in the midrange, but I believe this depends upon how the tube is being biased in the amplifier circuit.  Both them and the black glass National Unions seem to change character more than normal depending upon what amp they are in from my experience.  FWIW the NUs are surprisingly nice in the Icon, not the best sound you can get by any means but it had really good synergy with the DT880s in terms of tone.


Edited by Xcalibur255 - 9/3/13 at 4:41pm
post #3719 of 4483

I think I can get Ken-rad black glass and Rca smoked glass (both 1940s nos). Not sure if they are worth it though - each pair costs as much as my BGRP.

 

Really curious about the National Union too, which should I hunt? Are they the one where the dark glass only fill like 3/4 of the bottle from top? I think I also saw a grey glass version with construction really similar to the Rca grey glass with clear top - and a clear glass version.

 

Did you ever try the Cv1988 or 5692 with the Icon btw?


Edited by khaine1711 - 9/3/13 at 5:27pm
post #3720 of 4483

The KenRads and VT-231 RCA Greyglass shouldn't be fetching BGRP Tung Sol prices in my honest opinion.  Both nice tubes but the Tung Sols are simply superior in imaging and resolution.  Nationa Unions with the grey glass are quite rare, they are lively and more lit up in the treble than the black glass version.  You can ask Stavros (rosgr63) for a bit more detailed opinion since he has heard them more than I have.  I feel the black glass NU is a charming tube in terms of tone but not that great performance wise.  It has rather sloppy bass control for example.  Using it as an output tube in the Icon seems to minimize it's flaws though.  If you have any phones that are bright or thin this would probably do the trick.  A typical black glass NU is black almost to the base with a clear hole in the top that allows you to see the top mica.  The newer tubes seemed to have their coating stop a little shorter revealing a bit more glass (or often the getter flash) near the base.  There are several minor variations but as far as I could ever tell they all sound the same as long as the grid posts are copper. 

 

I don't like the RCA Greyglass much.  It has lots of fans but I'm not one of them.  The reason I like Sylvanias so much is because they can be romantic while still feeling transparent and not overtly colored.  The RCAs do sound overtly colored.  If this is your thing you'll love them, but when the timbres of instruments aren't being portrayed faithfully to me that is like turning the tint on your tv all the way to either the red or green side you just know it's wrong somehow.

 

As for Brimar CV1988s..... I had a pair but sold them.  They're nice, sort of a more tweedy and less "heavy" version of lush than an RCA is with better midrange resolution.  I really lean to the Sylvania sound so these thicker sounding tubes got sold off from my collection recently.  I've never used any 5692 tubes personally, just a gut feeling that tells me they're overrated for the prices they go for. 

 

As always just my personal take on it all, plus keep in mind my opinions are mostly from using these tubes as drivers.  I am finding for the most part my feelings on the tubes hold true using them as output, but there are some surprises like the National Unions.  I thought the VT-231 Raytheon ladder plate was quite exceptional in the Icon too.  I usually find this tube to be too dry in the midrange but it sounds excellent all around and very balanced in the Icon.

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