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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 323

post #4831 of 10502

Hi,

 

I am now testing my first 12V tube. This tube is from May 1948 and labeled Teletone:

 

It is an octal tube with black smoked glass. The number 274 indicates that it was made by RCA.

 

The Teletone Corporation manufactured tube radios and tube television sets from 40's up til 1954. Here is a 1948 tube radio.

 

Antique 1947 TeleTone AM Radio Model 135 Plays And Looks Great. FREE shipping!

 

Teletone is just a blip on the electronic history horizon and their styling and technology apparently were not endearing. Well, I found one example of interesting styling - an Ames radio:

 

http://i1.ytimg.com/vi/qEU9VN0q59U/maxresdefault.jpg

 

Anyhow, mostly forgettable. But how does this 12SN7GT tube sound?

 

In one word: Delicious. This is the first impression though; need it to simmer for a while.

 

Happy tube rolling!


Edited by mordy - 1/30/14 at 1:53pm
post #4832 of 10502

If anyone has a spare Tung Sol 6SU7GTY tube with black glass please PM me.

 

I've emailed a few sellers with no luck and I want a good tube to test out with my new octal adapter.

 

I have a new production Tung Sol 6SL7GT that has a little bit of background hum to it.

post #4833 of 10502

E80CC

 

After spending more time with the 1961 Holland E80CC and the 1967 Hungary E80CC, I am quite comfortable in saying that these are the best tubes I have. As one might guess, the Holland tube is a tad bit warmer and the Hungary tube is a tad bit airier, but the differences are subtle, and, as a fellow Headfier would say, amount to different shades of grey so to speak. I really don't have a preference for one over the other. They are that good. 

 

If you have an external heater PS, strongly recommended.

post #4834 of 10502
Quote:
Originally Posted by mab1376 View Post
 

If anyone has a spare Tung Sol 6SU7GTY tube with black glass please PM me.

 

I've emailed a few sellers with no luck and I want a good tube to test out with my new octal adapter.

 

I have a new production Tung Sol 6SL7GT that has a little bit of background hum to it.

 

While IMO, not quite as good as the Tung Sol, the Sylvania JAN CHS 6SL7WGT with black plates is very good tube, and I see a number of them on eBay at this  time.

 

post #4835 of 10502
Quote:
Originally Posted by gibosi View Post
 

 

While IMO, not quite as good as the Tung Sol, the Sylvania JAN CHS 6SL7WGT with black plates is very good tube, and I see a number of them on eBay at this  time.

 

 

 

Thanks! i'll see if i can snag one!

post #4836 of 10502
Quote:
Originally Posted by gibosi View Post
 

However, I have seen a listing for what is claimed to be a Hamburg-made Valvo E80CC:

 

Ah, thanks. It seems that some early production took place in Hamburg.

 

And this listing for a Brimar E80CC, which looks nothing like the Holland and Hungary tubes, with a short bottle and black plates, makes me wonder if it might be from old USSR....

 

It looks like a Brimar-made tube (or bottle) to me. I suspect it's not an E80CC, though, but a similar tube labelled as one.

post #4837 of 10502
Quote:
Originally Posted by mordy View Post
 

I am now testing my first 12V tube. This tube is from May 1948 and labeled Teletone:

 

It is an octal tube with black smoked glass. The number 274 indicates that it was made by RCA.

 

But how does this 12SN7GT tube sound?

 

In one word: Delicious. This is the first impression though; need it to simmer for a while.

 

 

It is my understanding that all the 1940s smoked-glass RCAs in this tube family, be they 6SN7GT, 12SN7GT or the 25 volt 1633s, sound essentially identical. And judging from my experience with a 1945 6SN7GT, the word "delicious" sums it up very nicely. :)

post #4838 of 10502
Quote:
Originally Posted by mordy View Post
 

I believe that you have the Raytheon 6CG7/6FQ7 tube. How does it compare to the tubes you did a shootout on?

 

I was able to compare a US-made Raytheon 6CG7 to a US-made 1940s Raytheon VT-231/6SN7GT. After going back and forth several times, I was unable to discern any significant difference. Since it appears that these tubes have the same innards, I was not surprised. I should note that I do not possess a Japan-made Raytheon 6CG7, so I have no idea how it might compare....

 

Raytheon 6CG7 and 6SN7GT (Click to show)
 
900x900px-LL-bf9166d8_2013-12-2811.54.34.jpeg900x900px-LL-fe72edcf_2014-01-2416.51.45.jpeg

 

Next, I compared the Raytheon VT-231 with the Holland E80CC. The reason I used the octal, rather than the 6CG7, was that it is much easier. I configured the socket to run the E80CC in 6-volt mode and, using a 6SN7 to 12AU7 adapter on the octal, swapping between tubes was simple and easy. Comparing the E80CC directly to the 6CG7 would have required that I adjust the voltage up, or down, every time.... too much of a hassle....

 

Anyway, I was quite surprised with what I heard. I have liked the Raytheon since I first heard it, and I still do. However, the Raytheon has a frequency bump in the mid bass region, adding a considerable bass presence to the sound.  Unfortunately, this tends to give the bass kind of a "one-note" sound rather lacking in detail. And further, since the mid bass is front and center, the mids and treble are recessed more than I would prefer. On the positive side, the mids and treble actually sound quite linear, but again, the mid bass bump is problematic, IMHO.

post #4839 of 10502

So guys... I might make a move to get a WA6 SE... I was listening to my Lyr today with my PS500's and even though my modded LD is quieter, the extra current of the Lyr really makes everything sound bigger. I'm not selling my LD though lol Its got some magic that the Lyr cant touch with my Grados and AD2000x. Someone talk me out of it lol My wallet needs a break lol

post #4840 of 10502

People so far not to dissuasive hmm ! :beerchug:

post #4841 of 10502
Quote:
Originally Posted by MIKELAP View Post
 

People so far not to dissuasive hmm ! :beerchug:

looks like I'll have 3 amps in rotation then lol

post #4842 of 10502
Quote:
Originally Posted by kvtaco17 View Post
 

looks like I'll have 3 amps in rotation then lol

Wont get bored thats for shure. :atsmile:

post #4843 of 10502
Quote:
Originally Posted by MIKELAP View Post
 

Wont get bored thats for shure. :atsmile:

I did audition the 1540's last weekend... and yeah not sold on them lol

post #4844 of 10502
Quote:
Originally Posted by kvtaco17 View Post
 

So guys... I might make a move to get a WA6 SE... I was listening to my Lyr today with my PS500's and even though my modded LD is quieter, the extra current of the Lyr really makes everything sound bigger. I'm not selling my LD though lol Its got some magic that the Lyr cant touch with my Grados and AD2000x. Someone talk me out of it lol My wallet needs a break lol

 

I am very curious to know how the WA6 SE sounds relative to the Lyr and the LD, so by all means please get one! lol :)

post #4845 of 10502
Quote:
Originally Posted by gibosi View Post
 

 

I am very curious to know how the WA6 SE sounds relative to the Lyr and the LD, so by all means please get one! lol :)

I probably will soonish... probably use my tax return cuz I can lol

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