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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 82

post #1216 of 6929

ePacket is something real. Basically, in order to stimulate buying in Hong Kong and China, the US post office made arrangements to allow overseas shipping from these places to tie into the USPS tracking and delivery system at low cost. The article below explains in more detail:

 

http://shippingsidekick.com/news.wml?id=450

 

Only one hitch: The weight limit is 2 kg (4.4 lb) for an ePacket. The LD MKIII weighs 3kg (6.6 lb)......
 

post #1217 of 6929

Mordy i sent the infos to that company you gave me the link in China for the socket. Tried to make them understand what i need and if its possible to do, personnaly i dont know, any of you guys know if it possible to strap #2and#7 pin in the socket itself and is it worth it because are they many tubes that we could use that socket for. Sent them another message because i want to know the outside diamete of the socket. they didnt say in first email. Thanks for any imput you guys would have. Processed By eBay with ImageMagick, R1.1.1.M2a

post #1218 of 6929

Did not know if this would be of interest to everybody, so I sent this info to Mikeleap. Since he posted about it, I am posting  the link:

 

Regarding socket adapters: I contacted one of the Chinese EBay sellers and asked them directly. They replied that they could make them up but need to know which tubes they are intended for. This is beyond my scope, but perhaps you would be interested in this.

 

From eBay 會員: happydiy 998 happyd_is5196qbzc@members.ebay.com.hk

 

"Hello,

yes, we can make for you, it's better you tell us which model tube you are using, and which model tube you want to use to replace it, then we can made accordingly, and send you quotation as well,

Looking forward to hearing from you soon,

Best Regards,
Vanessa

 

- happydiy998"
 
post #1219 of 6929
Quote:
Originally Posted by mordy View Post

Did not know if this would be of interest to everybody, so I sent this info to Mikeleap. Since he posted about it, I am posting  the link:

 

Regarding socket adapters: I contacted one of the Chinese EBay sellers and asked them directly. They replied that they could make them up but need to know which tubes they are intended for. This is beyond my scope, but perhaps you would be interested in this.

 

From eBay 會員: happydiy 998 happyd_is5196qbzc@members.ebay.com.hk

 

"Hello,

yes, we can make for you, it's better you tell us which model tube you are using, and which model tube you want to use to replace it, then we can made accordingly, and send you quotation as well,

Looking forward to hearing from you soon,

Best Regards,
Vanessa

 

- happydiy998"
 

 

I think we can answer this question in a way that makes sense to them:

 

"We are using an amp that uses 6AK5 and we want to replace it with 6AU6." 

 

As pins 2 and 7 in the 6AK5 are internally strapped, they should understand that we want a custom socket that will strap these pins together so that the 6AU6 can be used.

 

If you will send this text to them, let's see if they are willing to do this and if so, how much it would cost.

 

Cheers

 

Edit: Looking at their ad:

 

 

"5687 to 6N6 vacuum tube adapter socket converter handmade tube socket converter
 
if you choose this adapter, means you want to put your 5687  tube
 
on the adapter to connect to the 6N6 amplifier socket"
 
So their new ad would say:
 
"6AU6 to 6AK5 vacuum tube adapter socket converter
 
handmade tube socket converter
 
if you choose this adapter, means you want to put your 6AU6  tube
 
on the adapter to connect to the 6AK5 amplifier socket"
 

Edited by gibosi - 5/10/13 at 1:34pm
post #1220 of 6929
Quote:
Originally Posted by gibosi View Post

 

I think we can answer this question in a way that makes sense to them:

 

"We are using an amp that uses 6AK5 and we want to replace it with 6AU6." 

 

As pins 2 and 7 in the 6AK5 are internally strapped, they should understand that we want a custom socket that will strap these pins together so that the 6AU6 can be used.

 

If you will send this text to them, let's see if they are willing to do this and if so, how much it would cost.

 

Cheers

 

Edit: Looking at their ad:

 

 

"5687 to 6N6 vacuum tube adapter socket converter handmade tube socket converter
 
if you choose this adapter, means you want to put your 5687  tube
 
on the adapter to connect to the 6N6 amplifier socket"
 
So their new ad would say:
 
"6AU6 to 6AK5 vacuum tube adapter socket converter
 
handmade tube socket converter
 
if you choose this adapter, means you want to put your 6AU6  tube
 
on the adapter to connect to the 6AK5 amplifier socket"
 

 

 My request to you would be  to see if an adaptor could be made to accept 6AU6 tubes and possibly other tubes of the same genre this adaptor would be a 7pin male adaptor that would fit in a littledot mk3 amplifier and a 7 pin female adaptor on top to receive the 6au6a tubes or others of the same configuration. usually this amp does not natively accept these tubes only the EF92 AND EF 95 categories of tubes so to use the 6AU6 TUBES pin # 2 and pin #7must be strapped or liked with a wire for each channel We are looking for a way to achieve this with a socket that would be modified to accept these tubes just by inserting the modified socket . to recapitulate we need a 7pin male and female 7 pin adaptor socket  that fits in  the littledot mk3 sockets. one adaptor per channel the only thing i need to know is the exteriour diameter of the adaptor. Our male adaptor part would be shaped like the female end of your socket in picture enclosed . 
THIS IS THE TEXT I SENT TO THEM IS IT OK .
post #1221 of 6929
Quote:
Originally Posted by MIKELAP View Post

 

 My request to you would be  to see if an adaptor could be made to accept 6AU6 tubes and possibly other tubes of the same genre this adaptor would be a 7pin male adaptor that would fit in a littledot mk3 amplifier and a 7 pin female adaptor on top to receive the 6au6a tubes or others of the same configuration. usually this amp does not natively accept these tubes only the EF92 AND EF 95 categories of tubes so to use the 6AU6 TUBES pin # 2 and pin #7must be strapped or liked with a wire for each channel We are looking for a way to achieve this with a socket that would be modified to accept these tubes just by inserting the modified socket . to recapitulate we need a 7pin male and female 7 pin adaptor socket  that fits in  the littledot mk3 sockets. one adaptor per channel the only thing i need to know is the exteriour diameter of the adaptor. Our male adaptor part would be shaped like the female end of your socket in picture enclosed . 
THIS IS THE TEXT I SENT TO THEM IS IT OK .

 

Yes, this text should be fine. Even though you mention EF92 tubes, the fact that you clearly indicate that pins 2 and 7 need to be strapped should tell them that the converter needs to allow 6AU6 tubes to be plugged into a EF95 socket.  Let's see how they respond. :)

post #1222 of 6929
Quote:
Originally Posted by hypnos1 View Post

Hi there again J,

 

I got my 6485s, as did a couple of others here, from an ebayer in Germany - german-tubes - with very good deals in multiple units. It seems Audiofanboy requested tubes with CLEAN pins  - good idea - or else make sure you clean them thoroughly yourself (please excuse me if I'm "telling Grandma how to suck eggs"!!)...

Stateside on ebay.com it seems on offer are 5 units for $15.99 - also an excellent price for such marvellous tubes.Go buy , whichever applies...

 

I sincerely hope you manage to acquire some HD650s - if you're lucky perhaps even second-hand? I wish you all the best anyways.

 

Good luck with the 6485s also...

HI Hypnos1,  and many thanks for the tip, the TS 6485 are on its way (5 units for 15.99) looks like a really good price.  I do not live in the U.S., (Lima, Peru)  but a friend is coming in a few days.   You just do not find tubes here so easily, but looking really hard around old electronics stores you can find really nice NOS tubes at bargain prices ¡¡  What I will do with the tubes is to bring them to a veteran technician who happens to (still) have a tube tester, and ask him to select a "matched pair" from the five units.  Second, I will ask the man to test the tubes at full operational temperature for microphonics.  Then, I will have a "selected" pair of TS 6485.  Next step should be to solder a tiny, 30 awg solid wire between pins 2-7.  I agree with others in this forum that this is the best solution.  I know how to solder  and believe me, "clean" pins is not enough. You have to work very carefully the surface of the pins for a good solder joint, and it means completely removing the plating metal in that area. Second, the tips of the wire should be lightly "tinned" of course. Third, you have to apply just a tiny quantity of solder for a good joint, without compromising the pins connection.  All that in a very small space. It will not be easy, but I think I can do it.  Sorry about my ignorance, but I understand the 6485 is an EF95 tube, so I do not need to change any jumper settings, right ? 

 

BTW, the Voshkods are near full burn in now, and I am  really impressed.  The sound is way better now.  Gone are my feelings about a problem in the mids.  The bass was excellent but now is just outstanding, deep, tight, precise.  The highs are super extended,  but perhaps the top advantage  of this tube is not in some particular areas but in its big, dynamic, transparent sound.  It is kind of ruthless.  With some kind of music,  or better said, with some not-so-good recordings (compressed or over equalised) the Voshkods may hit too hard,  but with good material they can sound positively heavenly  If you know what I mean. However, the pair I have become  kind of mildly microphonic at full temperature, and that bothers me a lot at very low volumes. Curiously, the effect  is not that significant  with headphones, but my recent testing was done with the LD MKIII as a preamp directly into two mono, 250 W SS NAD amps, with my big DCM bi amped towers and I can tell you this is a hard  test for tubes.  Of course headphones are much more revealing and transparent,  but in terms of soundstage, bass and dynamics  here you have  a room to fill, and in this "real world" situation the Voshkods simply sounded superior to the other two or three tubes I have.  As you can see, this will be a nice test for the 6485's.  I´ll let you know...kind regards,                        

post #1223 of 6929
I'd rather see a socket adapter that disconnects pins 5 & 6. I REALLY hate hacking pins off of perfectly good tubes. Especially just for experimenting with tubes I may or may not enjoy.
I'm sure if these guys can do what you're asking them to, they can surely just not include pins 5 & 6 in another custom adapter.
post #1224 of 6929
Quote:
Originally Posted by Johnnysound View Post

Sorry about my ignorance, but I understand the 6485 is an EF95 tube, so I do not need to change any jumper settings, right ? 

 

 

Yes, you are correct. Leave your amp in the EF95 setting, and once you have pins 2 and 7 of your 6485 soldered together, simply plug it in and enjoy. 

post #1225 of 6929
Quote:
Originally Posted by inphu510n View Post

I'd rather see a socket adapter that disconnects pins 5 & 6. I REALLY hate hacking pins off of perfectly good tubes. Especially just for experimenting with tubes I may or may not enjoy.
I'm sure if these guys can do what you're asking them to, they can surely just not include pins 5 & 6 in another custom adapter.

 

Well, I rather enjoy cutting pins off of tubes. lol.

 

What I would like is one set of custom adapters with pins 2 and 7 connected, and another with pins 5 and 7 connected. With these, I could leave the amp in the EF95 setting and still be able to use every tube I have.

post #1226 of 6929
Quote:
Originally Posted by gibosi View Post

 

Well, I rather enjoy cutting pins off of tubes. lol.

 

What I would like is one set of custom adapters with pins 2 and 7 connected, and another with pins 5 and 7 connected. With these, I could leave the amp in the EF95 setting and still be able to use every tube I have.

Yes thats the main goal i guess . did not receive any feedback yet for the socket when i do will post there reply here and we will go from there.

post #1227 of 6929

 

i guess those tubes could be used with the 6au6 the 6j4p, 6j4, 6136,6au6wa,6au6wc,7543.the more the merrier because modded sockets will come out to $16.50 each +shipping.the ones below it says different heating for the 4au6, hf94, and xf94. if you know of any other type that could be used with the modded socket be my guest.Thanks guys

post #1228 of 6929
Quote:
Originally Posted by MIKELAP View Post

 

i guess those tubes could be used with the 6au6 the 6j4p, 6j4, 6136,6au6wa,6au6wc,7543.the more the merrier because modded sockets will come out to $16.50 each +shipping.the ones below it says different heating for the 4au6, hf94, and xf94. if you know of any other type that could be used with the modded socket be my guest.Thanks guys

 

The European EF94 is identical to the American 6AU6. So if you want a Mullard or Valvo 6AU6, you might want to search for EF94, rather than 6AU6.

 

And of course, these socket converters will allow you to use 6AH6/6485.

 

However, be very careful about 6J4P and 6J4. The American 6J4 is a triode. You might remember that the Sylvania 8532W is a premium version of the 6J4. However, the 6J4P is a Russian EF94/6AU6. You might remember that I tried these (post 928 page 62) and found them to be very noisy. It appears that many of the eBay vendors are not able to differentiate between these, so there is a good bit of confusion out there.....

 

$16.50 each, so two would be $33.00 plus about $7.00 to ship to the US... About $40.00 for a pair shipped to the US.... Not cheap, but it might be worth it in the long run....

post #1229 of 6929
Quote:
Originally Posted by gibosi View Post

 

The European EF94 is identical to the American 6AU6. So if you want a Mullard or Valvo 6AU6, you might want to search for EF94, rather than 6AU6.

 

And of course, these socket converters will allow you to use 6AH6/6485.

 

However, be very careful about 6J4P and 6J4. The American 6J4 is a triode. You might remember that the Sylvania 8532W is a premium version of the 6J4. However, the 6J4P is a Russian EF94/6AU6. You might remember that I tried these (post 928 page 62) and found them to be very noisy. It appears that many of the eBay vendors are not able to differentiate between these, so there is a good bit of confusion out there.....

 

$16.50 each, so two would be $33.00 plus about $7.00 to ship to the US... About $40.00 for a pair shipped to the US.... Not cheap, but it might be worth it in the long run....

its not that bad and those tubes if i remember sound good so its a hobby i rather spend it on that .on top of that these days might do something crazy very interested in new cans to go with the Conductor i got a month ago either the fostex th900 or th senns hd800 i would consider the LCD3 but theres no dealer here i  would listen mostly to classical, vocals, acoustic stuff i listened once to senns but ill go back a few more time to the store for more listening because i think the fostex are more like the Denons but more refined.and i also cant listen to the fostex either so might end up with the senns but not there yet. Exciting times.And by the way thank you for reminding about the 6j4 memory is something i have problems with sometimes .


Edited by MIKELAP - 5/11/13 at 12:18pm
post #1230 of 6929
Quote:
Originally Posted by gibosi View Post

 

Yes, you are correct. Leave your amp in the EF95 setting, and once you have pins 2 and 7 of your 6485 soldered together, simply plug it in and enjoy. 

Thanks gibosi. In the end the most practical solution for swapping tubes are the custom adaptors you are looking for.  The chinese can make them for sure...it they see a market.    Please let me know about previous posts, some kind of "guide" regarding tubes requiring 2-7 or 5-7 strapping.  I understand it is a way of using the LDMKIII  default   EF95 setting with many different tubes.     

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