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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 408

post #6106 of 10486
Quote:
Originally Posted by hypnos1 View Post

Hi sgbwill2.

Good to see new blood interested in what we have been discovering over these past many months...hopefully you have the time - and patience! - to look back over all the guys' work...you should find it quite interesting and informative.
As for my own set-up, if you're interested in the C3gs as drivers you are in luck..happydiy998 on ebay.com supplies C3g to 6AK5 adapters for $29.50 each...pricey, but I wouldn't recommend you even try going DIY if you don't have much experience in this area...too many possible pitfalls, believe you me!! The power tubes are 1 Psvane CV181 - TII, which is basically the same as a 6SN7 and 1 6AS7G. Again, you can get adapters for the 6SN7 - ebay.com, 6SN7 to 6CG7 for about $19.90 each. These and the drivers are then plug and play. With the MKIV SE it is simply a question of removing all the brass bits, then the adapters fit snugly into the LDs sockets. Other models that have rings atop the sockets need socket extenders also...if this applies to you, let us know and some of the other guys I am sure will chip in and advise you...
As for the 6AS7G as power tube, I can only vouch for how it suits the MKIV SE, but again I'm sure others here with more knowledge than myself may have additional input. This tube family can again be used with the 6SN7 to 6CG7 adapter...BUT THEY REQUIRE A SEPARATE POWER SUPPLY FOR THE HEATERS! Pins 4 and 5 on the 6CG7 section MUST NOT enter the LD. If you are interested in going this route, there is plenty of info going back a good few pages that I suggest you read VERY carefully, and post any doubts you may have. There's a wonderful bunch of very helpful guys in this thread.

Hopefully this has given you a bit more info to be getting on with...let us all know how you get on.

Cheers for now...supper calls!

Hi hypnos, I'm interested in your set up. Is it a simple plug and play with the adapters? Do I need a separate power supply as well? I'm no DIY person so bread boards and separate psu will be no no for me. Unless someone can build me one and I just plug and play from there smily_headphones1.gif
post #6107 of 10486
Quote:
Originally Posted by JoeDoe View Post

I realize this may be the wrong thread for this, but I've decided to sell my 1+. If anyone is interested PM me referencing this post and I'll cut you a deal.

 

Color me very surprised after your recent GE 5751 posting! What are you replacing your 1+ with?

post #6108 of 10486
Quote:
Originally Posted by gibosi View Post
 

 

Color me very surprised after your recent GE 5751 posting! What are you replacing your 1+ with?

I know I know! Still very impressed with this little guy. To me my new KICAS Caliente synergizes even better with the RS1s. Not to mention plenty of leftover power for my ZMFs. 

post #6109 of 10486
Finally received a pair of generic 6SN7s which I've used with the adapters and a pair of Voshkod 6ZH1P-EV and the sound out of the HD800 is full with rumbling bass. In a a word, lovely! Sure, the treble and high end energy seems a tad held back but it sounds good with my metal tunes.
post #6110 of 10486
Quote:
Originally Posted by gibosi View Post
 

 

Two 6AS7's draw 5 amps. The LD can provide, at most, 2.5 amps. If one was to try them without an external heater power supply, I can't see anything good happening. But I can easily imagine smoke and flames....

 

While I have never heard a psvane, it is worth noting that some believe them to be very good while others believe that many old-stock 6SN7's are better. Given that old-stock 6SN7's can often be had for not much money, my advice is to start cheap, and then, if you are not satisfied, move up to more expensive tubes.

 

I suggest that you check out the Reference 6SN7 thread to help you decide which ones you would like to try.

 

http://www.head-fi.org/t/117677/the-reference-6sn7-thread

Thanks for explaining that. I have just ordered 2 sets of p2n7's. a set of 1578 replicas and a pair of GE 6"N7GTB's. Just need to buy the adapters now. I dont think I am able to remove the brass rings so was wondering do you know of anyone who sells 7 pin extenders? As for c3g adapters I saw the ones you recommended but was wondering if these also work as they are slighltly cheaper and dont seem so rough around the edges:

http://www.ebay.co.uk/itm/321135529598?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

post #6111 of 10486
Quote:
Originally Posted by sgbwill2 View Post
 

Thanks for explaining that. I have just ordered 2 sets of p2n7's. a set of 1578 replicas and a pair of GE 6"N7GTB's. Just need to buy the adapters now. I dont think I am able to remove the brass rings so was wondering do you know of anyone who sells 7 pin extenders? As for c3g adapters I saw the ones you recommended but was wondering if these also work as they are slighltly cheaper and dont seem so rough around the edges:

http://www.ebay.co.uk/itm/321135529598?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

 

To use the 6SN7's as power tubes, you will need to use a 9-pin "extender", or socket saver, to allow for the brass rings. This plugs into your power tube sockets and then you plug your 6NS7 to 9-pin adapter into the extender.

 

http://www.ebay.com/itm/10-BAKELITE-9pin-tube-socket-testing-saver-for-12AX7-12AT7-12AU7-6DJ8-ECC82-6922-/221434781772?pt=Vintage_Electronics_R2&hash=item338e8aa04c

 

To use the C3g's as drivers, you will need a 7-pin extender, or socket saver, to allow for the brass rings:

 

http://leedsradio.com/parts-sockets.html#savers

 

Test socket 7 pin miniature                           $8.00

 

And the 8-pin to 7-pin adapter you found is specifically to adapt a 6X5 tube to a 6X4 socket. It will not work to adapt a C3g to a 6AK5 socket.

post #6112 of 10486

Just ordered some 9 pin extenders and 9 to 8 pin adapters as well as 2 7 pin extenders. Still have to get the c3g's though and their adapters. Unfortunately because leesradio is based in the US postage for the 2 7 pin extenders was $16 :( thanks for your advice though and I hope these tubes are worth the extra money buying the extenders and adapters.

post #6113 of 10486
Quote:
Originally Posted by Artsi View Post
 

Now this is starting to look like a Tube Amplifier to me. Excellent!

 

But there is still some way to go.

~15kg

 

Hi artsi - if you're still about!

 

Although nowhere near the 15kg, is this LD now looking even more the business?...:

 

 

And as for sound...well, now with the 6AS7Gs in both channels all I can say is...I'm lost for words! (which is unusual for me lol!).

 

Suffice to say there is even more of everything I have stated previously with just 1 in the hot seat - fortunately not too hot! Your earlier concerns, I am glad to say, seem to be handled amazingly well (by my MKIV SE at least), viz resistor temp maxing at 59C after 4 hours' continuous play. So hopefully everything should be OK?

 

ps. An addition to end results...there appear to be more 'layers' of sound - again something I haven't really appreciated/noticed in my rig to the same level at all before.

 

Also, and much to my surprise, I'm not having to crank up the volume much at all compared to before ...what can this humble marvel NOT cope with, I ask?!

 

Quote:
Originally Posted by gibosi View Post
 

 

Two 6AS7's draw 5 amps. The LD can provide, at most, 2.5 amps. If one was to try them without an external heater power supply, I can't see anything good happening. But I can easily imagine smoke and flames....

 

While I have never heard a psvane, it is worth noting that some believe them to be very good while others believe that many old-stock 6SN7's are better. Given that old-stock 6SN7's can often be had for not much money, my advice is to start cheap, and then, if you are not satisfied, move up to more expensive tubes.

 

I suggest that you check out the Reference 6SN7 thread to help you decide which ones you would like to try.

 

http://www.head-fi.org/t/117677/the-reference-6sn7-thread

 

Wise words as usual gibosi...given the price difference, some nice used (and already burnt-in!) 6SN7s would be a MUCH better buy.

 

 

 

Quote:
Originally Posted by Rossliew View Post

Finally received a pair of generic 6SN7s which I've used with the adapters and a pair of Voshkod 6ZH1P-EV and the sound out of the HD800 is full with rumbling bass. In a a word, lovely! Sure, the treble and high end energy seems a tad held back but it sounds good with my metal tunes.

 

Hi R.

 

Glad you're happy with the 6SN7s as power tubes...now if you could get someone to adapt the adapters to take an external heater supply, and splash out on the C3gs (preferably the 'S' version if possible, and not too much more $) I can't even begin to imagine what your 800s would sound like, if my 650s are anything to go by!

 

 

Quote:
Originally Posted by sgbwill2 View Post
 

Thanks for explaining that. I have just ordered 2 sets of p2n7's. a set of 1578 replicas and a pair of GE 6"N7GTB's. Just need to buy the adapters now. I dont think I am able to remove the brass rings so was wondering do you know of anyone who sells 7 pin extenders? As for c3g adapters I saw the ones you recommended but was wondering if these also work as they are slighltly cheaper and dont seem so rough around the edges:

http://www.ebay.co.uk/itm/321135529598?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

 

Am glad gibosi is putting you on the right track...what a guy! I agree about the appearance of those C3g adapters, but it seems they work OK. Good luck with your efforts (and expense!) - I'm sure you won't regret it one bit :wink_face:.

 

Speaking of adapters, just thought I'd post a pic of my latest one - for the 6AS7G. I think I'm finally getting the hang of making these things, but what a work-up...not to mention turning me into a nervous wreck!! Ah well, all because the guy loves silver...

 

 

The added bonus is that I can route the heater wires out the back of it...I really love neatness, where at all possible, lol.

 

ps. Dummy pin 9 to aid positioning - not wasting silver there! :biggrin:

post #6114 of 10486

Hi hypnos1,

 

Congrats to your super modded amp! Wish I could make these mods, but unless the adapters were available commercially I doubt that I'll get there since I don't think I could make them myself. Hopefully one of the Chinese adapter makers will pick up on your neat idea of having the heater wires coming out of the adapter socket!

 

Meanwhile I have gone the other direction re the size of the tubes and now I am using three sub miniature tubes; two as power tubes and one as driver. Surprisingly, this combination works well with a balanced and lively presentation. The treble is excellent and the bass is quite strong and I don't have the feeling that it is running out of steam. These tubes do not have the ultimate grip on the lowest frequencies of a bass drum with the bass control turned up fully,  but overall very pleasant and engaging to listen to. Look, for $7 worth of tubes this is a true bargain!

 

Raytheon Jan 6832 Submini dual Triode

post #6115 of 10486
Quote:
Originally Posted by gibosi View Post
 

 

To use the 6SN7's as power tubes, you will need to use a 9-pin "extender", or socket saver, to allow for the brass rings. This plugs into your power tube sockets and then you plug your 6NS7 to 9-pin adapter into the extender.

 

http://www.ebay.com/itm/10-BAKELITE-9pin-tube-socket-testing-saver-for-12AX7-12AT7-12AU7-6DJ8-ECC82-6922-/221434781772?pt=Vintage_Electronics_R2&hash=item338e8aa04c

 

To use the C3g's as drivers, you will need a 7-pin extender, or socket saver, to allow for the brass rings:

 

http://leedsradio.com/parts-sockets.html#savers

 

Test socket 7 pin miniature                           $8.00

 

And the 8-pin to 7-pin adapter you found is specifically to adapt a 6X5 tube to a 6X4 socket. It will not work to adapt a C3g to a 6AK5 socket.

 

Hi G,

 

With the C3G to 6AK5 adapter plus the 7 pin miniature socket saver, will the C3g tubes be plug and play without the need for an external power supply? If it is so, I will order some pronto!

post #6116 of 10486

The 2 6AS7Gs look great hypno. Rossliew according to previous posts the c3g's are plug and play with the adapter. Hypno or gibosi I was wondering what are the differences between the c3g and c3m tubes? I see the c3g's have gold pins but thats the only difference I have noticed. Have either of you had experience with the c3m's?

post #6117 of 10486
Quote:
Originally Posted by sgbwill2 View Post
 

Rossliew according to previous posts the c3g's are plug and play with the adapter. 

Great ! Looks like another round of fun hunting for tubes :D

post #6118 of 10486

Haha I know your troubles; im currently waiting for 6sn7 tubes and adapters and i am also in the process of getting some c3g tubes and adapters as well. its turning out to be quite an expensive process. my poor wallet :(

post #6119 of 10486
Quote:
Originally Posted by sgbwill2 View Post
 

Haha I know your troubles; im currently waiting for 6sn7 tubes and adapters and i am also in the process of getting some c3g tubes and adapters as well. its turning out to be quite an expensive process. my poor wallet :(

I bet it's all well worth it : )

 

Need to continue the hunt for affordably priced 6sn7s too. Anyone with spares willing to sell them off, kindly pm me!

post #6120 of 10486
Quote:
Originally Posted by gibosi View Post
 

 

To use the C3g's as drivers, you will need a 7-pin extender, or socket saver, to allow for the brass rings:

 

http://leedsradio.com/parts-sockets.html#savers

 

Test socket 7 pin miniature                           $8.00

 

 

I contacted Leeds Radio and they tell me that is a test socket and not a socket saver. Can I still order it and use it as a socket saver with the c3g to 6ak5 adapter ? I tried searching Ebay for a 7 pin socket saver but nothing came up...

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