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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 432

post #6466 of 10506

Guys, would the following vector adaptor with 12AX7 tube work with the Mk 3? http://www.head-fi.org/t/718599/lots-of-desktop-amps

 

Does it require an external power supply?

post #6467 of 10506
Quote:
Originally Posted by hypnos1 View Post
 

 

OMG! mikelap...looks like you struck gold TWICE, you lucky b******! Sure wish I had a flea market like that near me, lol...(don't see many valves - ie tubes - in such places here in the UK, more's the pity).

The guy has a website with the tubes he has in stock just check it out you never know this is the list he gave me regarding 6as7g tubes heres link for the website and list he sent me                                                  http://www.tubebazar.com/

                                                                                                

 

 

 

         

post #6468 of 10506
Quote:
Originally Posted by Rossliew View Post
 

Guys, would the following vector adaptor with 12AX7 tube work with the Mk 3? http://www.head-fi.org/t/718599/lots-of-desktop-amps

 

Does it require an external power supply?

 

Yes, these will work in LD 1, II, III and IV. Actually, you need two Vectors and an external 9-pin breadboard socket with compression block connectors.

 

Vectors are here:

 

http://www.radiodaze.com/product/15450.aspx

 

There are lots of breadboard sockets on eBay. Here is one:

 

http://www.ebay.com/itm/9-pin-Ceramic-Breadboard-tube-socket-for-Experiments-Prototypes-/161327960735?pt=Vintage_Electronics_R2&hash=item258fe5529f

 

You can roll 6DJ8 and 12AX7/12AT7?12AU7 without an external power supply. The external PS is necessary only when you are rolling tubes that need more than about .450 amps, such as 6SN7, ECC40 and E80CC.

post #6469 of 10506
Quote:
Originally Posted by gibosi View Post
 

 

Yes, these will work in LD 1, II, III and IV. Actually, you need two Vectors and an external 9-pin breadboard socket with compression block connectors.

 

Vectors are here:

 

http://www.radiodaze.com/product/15450.aspx

 

There are lots of breadboard sockets on eBay. Here is one:

 

http://www.ebay.com/itm/9-pin-Ceramic-Breadboard-tube-socket-for-Experiments-Prototypes-/161327960735?pt=Vintage_Electronics_R2&hash=item258fe5529f

 

You can roll 6DJ8 and 12AX7/12AT7?12AU7 without an external power supply. The external PS is necessary only when you are rolling tubes that need more than about .450 amps, such as 6SN7, ECC40 and E80CC.

Thanks...so I need to make an extra set of the vectors plus breadboard to complete it? 

post #6470 of 10506
Quote:
Originally Posted by Rossliew View Post
 

Thanks...so I need to make an extra set of the vectors plus breadboard to complete it? 

 

You need two vectors and one socket and then you can roll anything under .45 amps.

 

Here is a 6DJ8, and again, you do not need the external PS.

 

 

And here, a pair of C3g's, and again, you do not need the external PS:

 

 

And here is a sub-miniature Sylvania 7963, and again, no external PS is necessary:

 

 

edit: added sub-miniature


Edited by gibosi - 6/9/14 at 8:24am
post #6471 of 10506

Ok, got it..Joe's bundle includes both vectors and a breadboard. But for the 6DJ8, would I need to rewire the vectors to the breadboard?

post #6472 of 10506
Quote:
Originally Posted by Rossliew View Post
 

Ok, got it..Joe's bundle includes both vectors and a breadboard. But for the 6DJ8, would I need to rewire the vectors to the breadboard?

 

Yes, you would need to change the way pins 4, 5 and 9 are wired on the breadboard to configure the heaters properly depending on whether you are running 12AX7-type tubes or 6DJ8-type tubes. Loosen a couple screws, move a couple wires, retighten, and done. It's easy. :)

post #6473 of 10506
Quote:
Originally Posted by gibosi View Post
 

 

Yes, you would need to change the way pins 4, 5 and 9 are wired on the breadboard to configure the heaters properly depending on whether you are running 12AX7-type tubes or 6DJ8-type tubes. Loosen a couple screws, move a couple wires, retighten, and done. It's easy. :)

Gracias!!

post #6474 of 10506

And it just occurred to me, you could leave the socket in the 6DJ8 configuration and then purchase an adapter, 12AX7 on top and 6DJ8 on the bottom. 

post #6475 of 10506
Quote:
Originally Posted by MIKELAP View Post
 

The guy has a website with the tubes he has in stock just check it out you never know this is the list he gave me regarding 6as7g tubes heres link for the website and list he sent me                                                  http://www.tubebazar.com/

                                                                                                

 

 

 

         

 

Thanks mikelap. Will keep him in mind...

 

Unfortunately, I have a horrible feeling in my (increasingly old!) bones that, despite mordy's optimistic view that bargains will always "appear", we are now going to be at the mercy of the profit-takers...unless one wants RCAs, that is!  And as my C3GSs much prefer the Chathams, I can only hope these JANs have a good LONG life, lol! :(.

post #6476 of 10506
Quote:
Originally Posted by sgbwill2 View Post
 

Thank hypnos. Might attempt it sometime in the future. Seems like a fair bit of effort though I do like to see tube glow :) Why do the tubes have the casing in the first place? does it help to keep them cool? I was apprehensive of trying these c3g's due to the rave reviews and didn't want to be disappointed though I'm glad you and others recommended them. Along with the 6sn7's this amp is in another league now. Just got my sylvania 1952 'bad boys' 6sn7's to arrive and I think I'm set and wont be buying tubes (for the LD MKIII anyway) ever again unless another incredible tube like the c3g gets discovered.

 

Hi again sgb.

 

As long as you take things carefully and follow the instructions to the letter, it isn't too tricky a job, lol...

 

So glad you too can now enjoy the 'Super-LD', with those mods...we have come a LONG way since Dept-of- Alchemy started this thread. I only wish he could see - and HEAR - what has been achieved...haven't a clue what happened to him, unfortunately...

post #6477 of 10506

I just received C3Gs and adapters. Got excited and put them on LD MK IV.  BUT NO SOUND COME ON. If I crank the volume to the max I could hear tiny tiny sound. C3gs do get warm, so there is power just no sound. I think I got the bad adapters. Tubes that seeding in adapters are not straight (leaning one side) and adapters doesn't sit straight on LD sockets.  Kind of disappointed after all the wait.  Its strange that no sound from both channels. I put 6HM5 back on and they are working perfectly. Any idea? ( Is there ON/OFF switch on adapter? j/k).

post #6478 of 10506

That's a bummer! :(

 

And I agree with your thinking... The chance of getting two defective C3g tubes seems minuscule to me, so it must be that the adapters are wired-up wrong. Or maybe the adapter's ON/OFF switches are in the wrong position? lol Seriously, ask the adapter vendor to make this right for you.

 

Cheers

post #6479 of 10506
Quote:
Originally Posted by gibosi View Post
 

That's a bummer! :(

 

And I agree with your thinking... The chance of getting two defective C3g tubes seems minuscule to me, so it must be that the adapters are wired-up wrong. Or maybe the adapter's ON/OFF switches are in the wrong position? lol Seriously, ask the adapter vendor to make this right for you.

 

Cheers

C3Gs look spanking NEW to me but workmanship on adapters are HMMMmmmm how can I put it nicely!!! LOL. May be they do good job (most of you didn't have any problem with adapters) or may be this is just isolated case. I will contact ebay vendor now.

post #6480 of 10506

My adapters work fine. But they do look a bit different than yours....

 

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