Yes, they are the coin-based 6SN7GTB, and sound quite similar to the Sylvania GTB's with the "normal" base that have the same plate structure, although I might like the coin-base just a bit better.

On my second listen, I thought they sounded very similar.  I still prefer a Sylvania from 1949 and 1952, they make music more engaging to listen to because they are more prominent in the middle range.  

I sold two of the triangular plates (is that the right way to describe them) GTBs and kept a GT with ladder plate structure to myself :D

B36 MARCONI OSRAM 12SN7 NOS VALVE TUBE 1PC

 

At $149.19, is it overhyped and overpriced?

 

 

 

 Yeah, I've got my eye on it...

Edited by Silent One - 8/21/12 at 12:19am

Thanks for looking out. Price aside, is it a nice sounding tube?

I received my bunch of tubes that came with the mouse ears, and very very unfortunately the mouse ear had a crack on the base (those hairline sized ones...)

 

I paid 45+15 shipping for a total of 9 tubes... What should I do? Oh and btw included in the bunch, there's a tall bottle tungsol gtb as well!

SilentOne, do you an amp that will actually use a 12SN7?

Yes, the 6AS7 based custom built OTL amp by 2359glenn. I have a voltage quadrupler I'm listening to right now before bedtime. I have the Brimar 13D1; Ken Rad 1633, couldn't locate 25SN7 tubes yet. And a voltage doubler to run 12SN7 tubes, like john57 - we've the same OTL amps. Pictured with TSBGRP-VT231; TS5998; USAF-596...will have to take a new pix! 

 

 

 

 

 

Found it! Here's a pix of my 12SN7 > 6SN7 adapter and Russian 5U8C rectifier.

 

Edited by Silent One - 8/21/12 at 6:00am

It is more of a dishonest issue with the seller, but given the price i paid i really do not know should i ask for any compensations at all.

Might just ask for a discount on any possible future purchases.

OK, got it, SO. That's handy, as you can get some nice 12SN7's for much cheaper than their direct 6SN7 counterparts.

But a 12SN7 should be cheaper than that Osram!

Thanks...was in a shopping mood.  I missed a quad sale of TS-BGRP 12SN7 'cause I could only afford one.  Still on the look out for that one, that size. Then I could sell the 6SN7 siblings for extra cash. The Brimar took me by surprise like the calm before the storm - beginning to sound very nice.

The transformer in the OTL amp is a gorilla Skylab, it can take anything you can throw at it.  A very handy feature we've all been enjoying with Glenn's help.  FWIW I have found the 1633 KenRad to sound identical to the KenRad VT-231 blackglass and you can get them for $4. 

If the glass isn't genuinely loose against the base the tube is still okay Adrian.  The crack won't affecft its performance or lifetime.  I have/had several mouse ear tubes that were like this, it affects a lot of the early 50's tung sol 6SN7s.  If I were you I'd still keep the tube as rosgr63 recommended.