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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 268

post #4006 of 6943

Guys,

  Thanks for solving the op-amp query.I am going to use the ld mkiii.

 

I want the following tubes :-

Mullard M8100 

RCA 6DT6

Voshkod 6ZH1P-EV 

Yugi 6hm5

6N6P-ir 

 

Can anyone sell all of these ?

I want to buy all from one place since I will save a lot on combine shipping and the best option is little dot users.

I definitely want these :-

RCA 6DT6

Yugi 6hm5

6n6p-ir

 

Shipped to India.

Let me know.

post #4007 of 6943
Quote:
Originally Posted by gibosi View Post

 

 

Hey gibosi how much does your TUNG SOL JAN CTL 6SU7GTY go for. Thanks 

would $50.00 be reasonnable about it .It test NOS but is used


Edited by MIKELAP - 11/17/13 at 8:06am
post #4008 of 6943
Quote:
Originally Posted by MIKELAP View Post
Hey gibosi how much does your TUNG SOL JAN CTL 6SU7GTY go for. Thanks would $50.00 be reasonnable about it 

 

I gave more than $50 for mine. And looking at what's available on eBay, this is the lowest price available at this time.

post #4009 of 6943
Quote:
Originally Posted by gibosi View Post
 

 

I gave more than $50 for mine. And looking at what's available on eBay, this is the lowest price available at this time.

One last thing if theres a good octal tube to buy would this be it or theres better also is there a difference in contruction if its clear glass or black .Thanks

post #4010 of 6943

Since the Amperex OG with halo getters could be considered a "reference" tube, I decided to pick one up and found one for $13, manufactured in 1967. With that, configured the amp to play 6DJ8 and began listening. I now understand AFB's observations regarding the US-Amperex 6922 (1964) and the OG. While lacking the ultra detail of the 6922, I feel that the OG is more enjoyable. Moreover, I prefer it over both the Tesla and Valvo (Hamburg) E88CC.

 

Next, I decided to roll in the Voskhod (1978) 6N23P, as I hadn't heard it recently. The Voskhod has a sonic signature quite similar to the OG, with a lush, almost warm mid range, but a bit more bass presence and punch, and excellent flow and liquidity. Moreover, the Voskhod's ability to resolve ultra detail is second to none. Gong through my playlist of favorite songs, I heard details that I have never heard before. This is a seriously good tube.

post #4011 of 6943
Quote:
Originally Posted by MIKELAP View Post
 

One last thing if theres a good octal tube to buy would this be it or theres better also is there a difference in contruction if its clear glass or black .Thanks

 

From what I have read the TUNG SOL JAN CTL 6SU7GTY is generally considered to be the best of the breed. And specifically, you want black glass, black cylindrical plates and a brown base.
 

post #4012 of 6943
Quote:
Originally Posted by MIKELAP View Post
 

One last thing if theres a good octal tube to buy would this be it or theres better also is there a difference in contruction if its clear glass or black .Thanks

From this post you see differences. Mine looks like the one from the right.

http://www.head-fi.org/t/297795/ec-zana-deux-tube-rolling-pls-share/30#post_4648721

 

I paid my National and Heinz kaufman 6SU7GTY's 24 and 26euros.

 

Edit: Trying to bid pairs of "better" 6SN7's, but they cost a fortune... Hope i get some made in USA's.


Edited by Artsi - 11/17/13 at 11:41am
post #4013 of 6943
Quote:
Originally Posted by gibosi View Post
 

Since the Amperex OG with halo getters could be considered a "reference" tube, I decided to pick one up and found one for $13, manufactured in 1967. With that, configured the amp to play 6DJ8 and began listening. I now understand AFB's observations regarding the US-Amperex 6922 (1964) and the OG. While lacking the ultra detail of the 6922, I feel that the OG is more enjoyable. Moreover, I prefer it over both the Tesla and Valvo (Hamburg) E88CC.

 

Next, I decided to roll in the Voskhod (1978) 6N23P, as I hadn't heard it recently. The Voskhod has a sonic signature quite similar to the OG, with a lush, almost warm mid range, but a bit more bass presence and punch, and excellent flow and liquidity. Moreover, the Voskhod's ability to resolve ultra detail is second to none. Gong through my playlist of favorite songs, I heard details that I have never heard before. This is a seriously good tube.

 

Nice tube right? I think the expression "killer tube" very well describes the Amperex OG. While I agree it doesn't immediately sound ultra-detailed, it really grows on you, and presents music with in a very resolving way yet delicious and musical.

 

Still, though I had the exact same analysis you have when comparing the OG to '64 US-made Amperex 6922, I have to admit that the earlier '62 tube I've been using since yesterday has really blown my mind. Where I gave the OG a -hypothetical- 8.9/10, and the '64 US Amperex a 9/10, the '62 US Amperex is definitely a step above that, at 9.3 or 9.4/10 or something. That tube is quite amazing in its ability to throw a credible "room" at you; not music, but the whole world the artist wanted you to hear. Fascinating really. I have even more trouble doing anything else while listening to music with this tube than with the OG (and it was pretty hard to focus on work with the OG lol).

post #4014 of 6943

Got myself a couple octals not the top of the line ones but decent i hope.Sockets should be here this week ,its been 3 weeks since i ordered will get started on adaptors  this week hopefully. and octal adaptors well thats another 3 weeks probably.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             

Processed By eBay with ImageMagick, z1.1.0. ||B2

Processed By eBay with ImageMagick, z1.1.0. ||B2

post #4015 of 6943

Hi,

 

Getting nervous, all the octal tubes that are recommended are really expensive! Are there any good alternatives that are less expensive?

 

How about the Tung Sol reissue of the 6SL7GT:

 

http://www.ebay.com/itm/Tung-Sol-6SL7-6SL7GT-pre-amp-tubes-Reissue-NEW-/150562014374?pt=Vintage_Electronics_R2&hash=item230e3204a6

 

and the Chinese Shuguang 6N9P:

 

http://www.ebay.com/itm/Tung-Sol-6SL7-6SL7GT-pre-amp-tubes-Reissue-NEW-/150562014374?pt=Vintage_Electronics_R2&hash=item230e3204a6

 

Should I just get the Russian 6N9S Saratov tube:

 

http://www.ebay.com/itm/6N9S-Saratov-Made-TUBES-MATCHED-PAIR-NOS-in-BOX-6SL7-/350821836762?pt=Vintage_Electronics_R2&hash=item51ae9c67da

 

Anybody has experience with these?

post #4016 of 6943

Long time follower of this thread so about time I made a contribution.

 

 

Whilst everyone is moving on to larger tubes I thought I would go in the other direction.

This is a sub-miniature russian 6N16B-E dual triode.

 

 

So how does it sound ? Well, I have had it running for less than an hour but first impressions are very good - sweet, sparkly highs and punchy bass, good detail, big soundstage and overall very smooth sounding. Much better than an RCA 6BQ7A which I tried in this setup before, which although very detailed started to sound harsh with further listening.


Edited by Ctritical Bill - 11/17/13 at 5:47pm
post #4017 of 6943
Nice!
I had a look at and pondered those sub mini dual's... Good to see someone using them!
post #4018 of 6943

Hi Ctritical Bill,

 

 

I have seen these sub miniature tubes mentioned, and I am happy to see somebody trying them. Seems that bigger is more expensive when it comes to tubes, and these are not that expensive and usually come in lots of 4 or 8.

 

Could not find 6N16B-E on Ebay, but 6N16V, 6N16B-I, 6N16B-VI, 6N16B-VR, and 6N16B-Q. The VR is supposed to last 2000 hours. Would you know what these tube designations correspond to? Are there other types that  would work in the LD MKIII?

 

From your picture it looks like you are using it as a driver tube, but some of the Ebay posts list them as 6SN7 equivalents, which would indicate a power tube.

 

How do you know which lead is which? How do you wire them? Same way as octals?

 

Could you elaborate on your flying tube set-up?

 

Hope you don't mind the questions.....

post #4019 of 6943
Quote:
Originally Posted by mordy View Post
 

Hi Ctritical Bill,

 

 

I have seen these sub miniature tubes mentioned, and I am happy to see somebody trying them. Seems that bigger is more expensive when it comes to tubes, and these are not that expensive and usually come in lots of 4 or 8.

 

Could not find 6N16B-E on Ebay, but 6N16V, 6N16B-I, 6N16B-VI, 6N16B-VR, and 6N16B-Q. The VR is supposed to last 2000 hours. Would you know what these tube designations correspond to? Are there other types that  would work in the LD MKIII?

 

From your picture it looks like you are using it as a driver tube, but some of the Ebay posts list them as 6SN7 equivalents, which would indicate a power tube.

 

How do you know which lead is which? How do you wire them? Same way as octals?

 

Could you elaborate on your flying tube set-up?

 

Hope you don't mind the questions.....

 

I am not an expert on russian tube designations but I will share what I have seen elsewhere. E means extended life, usually 5000hrs. V means military. I is for pulse oparation. Never come across Q.

I have looked at quite a few different russian sub-miniatures as well as some of the american ones. There aren't many that are suitable for one reason or another. This is what I noted down while looking for suitable russian tubes :

Subminiature triodes :
6S7B - 5 leads - single triode 250v plate
6S31B - 8 leads - single triode 50v plate
6S32B - 10 leads - single triode 200v plate
6N21B - 10 leads - twin triode 200v plate
6N16B - 8 leads - twin triode 100v plate - most suitable
6N17B - 8 leads - twin triode 200v plate
6N28B - 10 leads - twin triode 50V plate
6N33B - 6 leads - twin triode 100v plate

 

The plate voltage is important because it has to be within the range that the LD uses. I haven't been able to measure the actual voltage yet but taking the well known 6Zh1P as my example, that operates ideally around 120v, I looked to get close to that. Looking at datasheets is the thing to do.

 

Yes, I am using it as a driver tube but, with the right setup, it could be used as a power tube.

 

The most difficult part was identifying the pins and wiring it up, eveything is so small. The datasheet shows the pin outs but identifying the actual pin numbers wasn't clear. I found on the base of the tube, embedded in the glass, a simple line 'l' which lines up with pin 1. Just a case of following the datasheet from there :

 

9 pin socket         tube wire

  1                         5

  2                         3

  3                         2

  4                         4 (or 8 - heater)

  5                         8 ( or 4)

  6                         1

  7                         7

  8                         6

  9                         no connection

 

I used a 9 pin socket saver and soldered the wires onto suitable sized pins pushed into the socket saver.

post #4020 of 6943
Here is link to list of different sub-minis. I think none of them has enough power to use as powertube.
home.netcom.com/~wa2ise/radios/penciltubes.html
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