[Oskari]

That's lovely, Nic. Thanks!
 
Have you found a Philips code on it?

 

[Porteroso]

Makes the ts rp look cheap, I wonder how many people have directly compared the 2.

 

[lojay]

Makes the ts rp look cheap, I wonder how many people have directly compared the 2.

http://m.ebay.com/itm/201274005281?nav=SEARCH This is wildly exorbitant. Can't imagine a pair of B65 fetching $4k.

 

[Nic Rhodes]

Makes the ts rp look cheap, I wonder how many people have directly compared the 2.

 I can and like both, though their style is very different to each other (metal base). No obvious Delta codes on glass Oskari but some codes on the base I think. For those that are experimenting there is a much cheaper 12v version called the B36 which is affordable if you can deal with the different heater voltage. I prefer it to even the 12SX7GT. The B65 metal base also turns up  labelled as CV1988 or  6SN7GTY, certainly looks the same and carries the MO Valve Company, Hammersmith 'Z' code along with the signature metal base (and is much cheaper than the numbers quoted above). It is different from the CV1988 / 6SN7GTY STC examples from Oldway and Footscray which are black or brown phenolic based tubes.

 

[Oskari]

  No obvious Delta codes on glass Oskari but some codes on the base I think.

 
If Philips, it was likely made in Eindhoven, so wouldn't have the Heerlen delta. It could well be an MBLE-made tube (Adzam) from Brussels (L factory code) as well.
 

  The B65 metal base also turns up  labelled as CV1988 or  6SN7GTY, certainly looks the same and carries the MO Valve Company, Hammersmith 'Z' code along with the signature metal base (and is much cheaper than the numbers quoted above).

 
Yeah, that's where the real UK B65s came from.

 

[isquirrel]

The B65's I have heard had a shimmer although couldn't call them bright, however it added to the impression that they were a little bright. I thought they were lighter sounding than the TS RP's. The TS RP's seem to be at their best when driving SET's.

 

[Nic Rhodes]

I think these made in Holland Marconi tubes are actually Belgium 'Mazda / Adzam's'

 

[Oskari]

That's that sorted. 

 

[Nic Rhodes]

http://www.ebay.co.uk/itm/B36-TUBE-Equiv-12SN7GT-CV-925-MARCONI-VALVE-AMPLIFIER-HOLLAND-NEW-OLD-STOCK-/231496510063?pt=LH_DefaultDomain_3&hash=item35e6446a6f
 
Two B36 Marconis made in Holland with black bases so they are not uncommon.

 

[Badas]

Anyone know anything about these:
 
http://www.ebay.com/itm/261800006599?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
 
I'm not interested. I'm just kinda curious. Could they be used as drivers in some circuits?

 

[gibosi]

  Anyone know anything about these:
 
http://www.ebay.com/itm/261800006599?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
 
I'm not interested. I'm just kinda curious. Could they be used as drivers in some circuits?

 
http://www.radiomuseum.org/tubes/tube_6s7g.html
 
It is certainly possible....
 
However, these are pentodes, so one would probably want to strap them as single triodes and use a pair. But even then, there is no telling how they might sound....

 

[Mechans1]

 I  am sorry I don't know the answerit is of course reasonable..
I have not read nor I have I really thought about the specs, so I can't help you there. The outstanding feature here  is the top electrode which sends a very large percentage of the potentially interested members away.
 
 
I just wanted to comment on what's happening, in at least this corner,  of the threads .  I have been a 6SN7 roller for over a decade and then had to stop collecting for a while after a divorce.  It sent me  to the headphone community, and I was delighted to see others had a passion reproduced audio and my favorite tube.  What I wasn't quite prepared for, wnas the intense interest in tubes, some of which  I had considered unobtanium. B65 was only  in my dreams,  I realized I no longer needed to buy volumes of tubes to try and give or trade away. to members of my audio group/club.   When my circumstances changed, I decided to buy only the better tubes, no more middle level stuff (with a few exceptions)  I had a couple of battle worn Brimar Black and one grey CV1988 6SN7GTY, which I really liked and decided in my usual collector mindset that I need some better examples and bought 2 pair of the Brown Base CV1988s one tube of which I am using as my preamp tube for my -don't ridicule me for this- SinglePower Extreme which for all of it's  former engineer crimes sounds really good to my ears.
I am also a follower of Audio Asylum's Tube Asylum and there free market place.  One of the better known contributors advertised who advertised NOS NIB Mullard CV181's NOS NIB  of fairly recent production= early 80s.  I was so happy that guy who opinions I treasured was respected so  similar to my own. 
I bought a pair of the smoked glass Mullard CV 181    they are smoked glass with appropriate marks .on  the tubes  I listened to them for hours and found them very, very enjoyable, not lacking the bass that others seem to find. I bought one more for a different application.. No regrets even thought they were expensive and that the seller has warned me about overtaxing the filament.
After Tax season is over and when I may have some spending money I think I will try your top electrode tubes.  I have used one in a past amplifier and found it to be no trouble at all.
I could use a primer on the jargon and meaning of the current contributors, thanks in advance- Steve

 

[Khragon]

Hi guys,
 
Is this a match pair in your opinion? Hickok TV-7 tested
TS 6SN7 BGRP #1
Triode 1/2: 84/90 (min 50)    --- Mutal conductance:  Triode 1/2: 2100/2250 (min 1250)
 
TS 6SN7 BGRP #2
Triode 1/2: 90/100 (min 50)  --- Mutal conductance:  Triode 1/2: 2250/2500 (min 1250)
 
Thanks.

 

[Mechans1]

I found the sound of the TS round plate tubes to correlate poorly with testing. Of the three pairs I own the pair with mediocre test scores are the best sounding by far,  and validated by my audio friends.
 That said the only choice you have if you want to get them is to buy tubes that test wellas in this case.  The numbers look fine for transconductance and match well for a pair. 
Good Luck and Best-

 

[dminches]

  Hi guys,
 
Is this a match pair in your opinion? Hickok TV-7 tested
TS 6SN7 BGRP #1
Triode 1/2: 84/90 (min 50)    --- Mutal conductance:  Triode 1/2: 2100/2250 (min 1250)
 
TS 6SN7 BGRP #2
Triode 1/2: 90/100 (min 50)  --- Mutal conductance:  Triode 1/2: 2250/2500 (min 1250)
 
Thanks.

 
What is the application?