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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 342

post #5116 of 6978

I was on my way to buy some MDF board to build the inclosure for my amp/tubes and on the  curb someone dump a old YAMAHA AMP i picked it up and  here is what i came up with.

 

 

I will be keeping these for a while.

post #5117 of 6978
Quote:
Originally Posted by CollectoR13 View Post

My siemens C3GS and sylvania 6sn7gt arrived!
I am usually not that into looks, but this tubes are looking so beautiful!
I am so desperate to try them, but unfortunally my Sockets for the C3GS didn't arrive yet...
Now I have to build everything together into a clean black case, I hope the silver wire I bought is not too stiff, hopefully it will serve its purpose.
I will make a table for the 6n6p to 6sn7 conversion, could anyone correct it if its wrong?
I will uplpad it soon!

Thanks guys!


 Hey C. Don't know if you have sprung the C3gSs from prison yet, but they DO look beautiful!

Congrats on the silver wire - these tubes certainly deserve some special treatment. Hopefully you got soft-annealed wire, which is supposed to be better for sonic performance, and is quite easy to bend.

Remember to give them a good period of burn-in for the real magic to appear - I personally found they kept improving up to 30+ hours (how much is due to burn-in of the tube and how much to the new wire/adapter I couldn't say).

Good luck with your efforts...I really look forward to your impressions.

post #5118 of 6978

Here's the xDuoo with the Mullard's:

 

 

 

post #5119 of 6978

Hi,

 

Listening to a RCA 6SN7 tube from 1967 that sounds great.

I have two such tubes from 1965 and 1967 in my 260 stash. One is pictured above; the other one says RCA but lacks the 6SN7 designation on the tube. Both have clear tops with that funny little wire on top.

The getter is in the bottom of the tube. I assume that the getter flash is there also, but it must be covered by the bakelite base because I cannot see it. Another interesting construction detail is that all the wires internally have been brought into one vertical plane and encased in some kind of glass.

 

 

 

Can't remember reading about these tubes as great sounding tubes, but they really sound delicious. The sound stage is remarkable - wide, holographic. Does anybody have experience with these tubes?

 
post #5120 of 6978

Hi mordy!

 

It's like Déjà vu, did you not just post that a few hours ago?

 

post #5114

 

:D

post #5121 of 6978
Quote:
Originally Posted by TrollDragon View Post
 

Hi mordy!

 

It's like Déjà vu, did you not just post that a few hours ago?

 

post #5114

 

:D

Theres probably a tear in the space time continuum TD thats why !.:rolleyes: 

post #5122 of 6978
Quote:
Originally Posted by MIKELAP View Post
 

Theres probably a tear in the space time continuum TD thats why !.:rolleyes: 


Using those tubes must be creating a tear in the magical fabric...

I need to quickly find a Sonic Screwdriver just in case...

post #5123 of 6978
Quote:
Originally Posted by TrollDragon View Post
 


Using those tubes must be creating a tear in the magical fabric...

I need to quickly find a Sonic Screwdriver just in case...

No its ok ill beam one down Scotty i mean TD !

post #5124 of 6978

Hi TD and Mikelap,

 

Was worried that nobody read my edited post where I added on pictures. Seriously, I think that these tubes are very special. I wish  somebody could confirm (or dispute) my impressions about these tubes, as well as the 8FQ7 Japanese or Sylvania tubes.

 

So many great tubes, and at bargain prices as well - I feel like a kid in a candy store.....

 

In case somebody needs an idea for a birthday present, I found this great suggestion:

 

http://4.bp.blogspot.com/_lduzNYtkEHU/S9ExXIvcBXI/AAAAAAAAB14/oG4clvXvVMY/s1600/P1010729.JPG

Have fun!

post #5125 of 6978
Quote:
Originally Posted by mordy View Post

 

Was worried that nobody read my edited post where I added on pictures. Seriously, I think that these tubes are very special. I wish  somebody could confirm (or dispute) my impressions about these tubes, as well as the 8FQ7 Japanese or Sylvania tubes.

 

In my opinion, the small-bottle Sylvania 6SNGT and 6SN7GTA from the late 1940's and early 1950's are great buys, often very cheap, with deep bass, natural sounding vocals and crystal clear highs. The Sylvania 6SN7WGT and 6SN7GTA are also great sounding tubes, but I don't find them to sound significantly different than the regular GTs and GTAs, and don't believe they are worth the extra cost. My only criticism of these small-bottle Sylvanias is that on some recordings, I find the mid-range to be just a tad bit thin and dry. But on most recordings, I find these tubes to be very enjoyable. Strongly recommended.

 

I was going to purchase a Japanese Raytheon 8FQ7 to have the same tube Mordy favors so highly. However, due to a mix up of some sort, while I successfully purchased this tube, it was in fact not available. So I got my money back, but I didn't get the tube. However, I dug out the 8FQ7s I purchased some time ago, and it appears that two of them are Japanese. One looks to be a Toshiba, but I am not at all sure about the second one. Will take some pictures and post them tomorrow.....

post #5126 of 6978

Two Japanese 8FQ7

 

Comparing the first tube to pictures on the web, I believe this to be a Toshiba 8FQ7, with short square plates and a small O-getter. Unfortunately, other than the circled H, which I have seen on other tubes made by Toshiba, any printed text or graphics has rubbed off. 

 

 

The second tube has "Japan" and the date "7022" printed on it, and it carries the IEC brand which might indicate a Mullard - Matsushta connection. However, I have also seen these long, gray, flat-ladder plates on tubes made by Toshiba and Hitachi.

 

 

Mordy, do either of these resemble yours?


Edited by gibosi - 2/24/14 at 7:24am
post #5127 of 6978
Quote:
Originally Posted by mordy View Post

 

Listening to a RCA 6SN7 tube from 1967 that sounds great.

 

Can't remember reading about these tubes as great sounding tubes, but they really sound delicious. The sound stage is remarkable - wide, holographic. Does anybody have experience with these tubes?

 

The only RCA I have is the 1940's smoked-glass gray 6SN7GT, and I would describe it similarly, very warm with a huge sound stage. As I have said before, I think it conveys an exquisite balance of warmth and detail. However, I have never heard the later RCAs so cannot say how they might compare....

 

In my experience, live music is much warmer, with more bass and less detail, than the rather cool, analytical, ultra-detailed sound that many headfi enthusiasts prefer. Given that I tend to swing on the warm and bassy side, the signature sound of the 6SN7, with its strong bass and warm presentation, is very appealing to me. And in fact, the 1940's RCA could be called the poster child of the 6SN7. Listening to this tube, with its strong bass and reverberations bouncing off all the walls, transports me into a wide, deep, 3-D performance space. Yes, sometimes it does seem to be a bit too syrupy and sometimes I would welcome a bit more detail, but most of the time, it is simply delicious. Strongly recommended unless you are a detail freak. :)  

post #5128 of 6978
Quote:
Originally Posted by gibosi View Post
 

 

The only RCA I have is the 1940's smoked-glass gray 6SN7GT, and I would describe it similarly, very warm with a huge sound stage. As I have said before, I think it conveys an exquisite balance of warmth and detail. However, I have never heard the later RCAs so cannot say how they might compare....

 

In my experience, live music is much warmer, with more bass and less detail, than the rather cool, analytical, ultra-detailed sound that many headfi enthusiasts prefer. Given that I tend to swing on the warm and bassy side, the signature sound of the 6SN7, with its strong bass and warm presentation, is very appealing to me. And in fact, the 1940's RCA could be called the poster child of the 6SN7. Listening to this tube, with its strong bass and reverberations bouncing off all the walls, transports me into a wide, deep, 3-D performance space. Yes, sometimes it does seem to be a bit too syrupy and sometimes I would welcome a bit more detail, but most of the time, it is simply delicious. Strongly recommended unless you are a detail freak. :)  

 

Hi g.

So you like syrup eh? Me - I prefer honey! Preferably with lots of different, subtle flavours...which is what I am getting from my C3gSs!! The thing about uber detail is that music you have heard many times becomes something wonderfully new and showcases the sound engineer's craft - given a decent performance in the first place! These babies have detail in abundance, and sometimes I can't believe I am listening to the same tracks I have heard many times before...Plus, tracks I never previously had any time for suddenly have me thinking - my goodness, now I can understand why they were included in the album.

So, mon ami, if this doesn't appeal, I think you had best move them a bit further to the back of the burner!! BUT, I have a sneaky feeling that if you found the right pieces of music you just might also catch the 'bug'...who knows?...

Whatever, I'm glad all your research is bearing fruit for your (poor?! Edit: they are indeed true martyrs to the cause) ears.

 

Cheers.


Edited by hypnos1 - 2/24/14 at 11:35am
post #5129 of 6978

Hi Gibosi,

 

I have three different Japanese 8FQ7/6CG7 tubes. The first tube you pictured is identical to one of mine. The H indicates Toshiba (not Hitachi - go figure), and I labeled this one as Very Good. I don't have any other markings than you, so I don't think that they rubbed off - they simply weren't there to begin with.

 

The star of the three is the Raytheon/Hitachi tube - sorry you did not get it.

 

The third tube is labeled Silvertone (Radio Shack?) and has the markings AAF and 635. Gave this tube an Excellent rating.

 

This Silvertone tube could be made by any of the major Japanese manufacturers, Ten, Hitachi, Toshiba, Matsushiita.

 

About dating: What would be an educated guess for 635? The 35th week 1966?

post #5130 of 6978
Quote:
Originally Posted by mordy View Post
 

The star of the three is the Raytheon/Hitachi tube - sorry you did not get it.

 

The third tube is labeled Silvertone (Radio Shack?) and has the markings AAF and 635. Gave this tube an Excellent rating.

 

About dating: What would be an educated guess for 635? The 35th week 1966?

 

I expect that one of these Japanese Raytheons will pop up on ebay eventually....

 

"Silvertone" was a Sears Roebuck brand back in the day. And 1966 seems like a good guess to me, but who knows? :)

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