or Connect
Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › Little Dot Tube Amps: Vacuum Tube Rolling Guide
New Posts  All Forums:Forum Nav:

Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 409

post #6121 of 10486
Quote:
Originally Posted by Rossliew View Post

 

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!

 

No external power supply is needed. The C3g's draw .37 amps each, for a total of .74 amps, which is well within the LD's internal 1 amp heater supply. Two C3g's, two adapters and  two extenders, and you are good to go.

 

Quote:
Originally Posted by Rossliew View Post
 

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...

 

Technically, it is a test socket, but it can be used as a socket saver. The only difference is the exposed metal rods on top which would allow one to use a multimeter to check such things as plate voltage, grid voltage and so forth.

 

 

post #6122 of 10486
Quote:
Originally Posted by sgbwill2 View Post
 

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?

 

The C3g has 6.3 volt heaters, whereas, the C3m has 20 volt heaters. You would need an adjustable external power supply to use these. There are also some other construction differences, but I have no idea how different they sound. There is also a C3o, which is a 6.3 volt version of the C3m, but these don't show up on eBay all that often.

 

Edit: Also, the socket would have to be reconfigured for C3m/C3o tubes, which means the C3g-to-6AK5 adapter would not work....


Edited by gibosi - 5/13/14 at 10:22am
post #6123 of 10486
Quote:
Originally Posted by gibosi View Post
 

 

The C3g has 6.3 volt heaters, whereas, the C3m has 20 volt heaters. You would need an adjustable external power supply to use these. There are also some other construction differences, but I have no idea how different they sound. Also, there is also a C3o, which is a 6.3 volt version of the C3m, but these don't show up on eBay all that often.

Thanks for clearing that up. Do you think the c3o is sonically identical to the c3g?


Edited by sgbwill2 - 5/13/14 at 10:27am
post #6124 of 10486

Thanks @Gibosi. Proceeding with my orders!

 

Them 6SN7s have so many variations, i'm going dizzy...

post #6125 of 10486
Quote:
Originally Posted by JoeDoe View Post
 

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. 

 

The reviews certainly suggest that the KICAS Caliente is a very good little amp, so I am not surprised you are liking it. However, I think you should keep the LD 1+, and for the purpose of furthering our "LD Research Program", put a MUSES 02 op amp in it and a pair of C3g's and tell us how it compares to your KICAS. :)


Edited by gibosi - 5/13/14 at 10:34am
post #6126 of 10486
Quote:
Originally Posted by sgbwill2 View Post
 

Thanks for clearing that up. Do you think the c3o is sonically identical to the c3g?

 

As the C3o is identical to the C3m, except for the heaters, these two tubes should sound the same. However, I haven't found reviews comparing them to the Cg3. And besides, the C3o requires a different adapter. The C3g adapter will not work. One more obstacle that would have to be overcome.....


Edited by gibosi - 5/13/14 at 10:35am
post #6127 of 10486

Thanks I think i will play it safe then and get the c3g's

post #6128 of 10486
Quote:
Originally Posted by mordy View Post
 

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

 

Hi mordy. Thanks. But hey, it's not too difficult to alter the 6Cg7 adapter to take the 6AS7/6080 as power tube. With the MKIV, and no extender necessary once all the brass bits are removed, it just needs pins 4 and 5 cut with enough left to solder the new power supply wires, then covered with tape. I found that worked perfectly (obviously they mustn't project too far out!). If socket extenders are needed (I'm assuming they are available for 8-pin to LD's 9-pin?), the wires could be wedged in atop the extender and its pins 4 and 5 at the LD cut off completely.

Well, so I think anyway, mordy...

 

Quote:
Originally Posted by Rossliew View Post
 

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

 

 

Yo R. That's all part of a tube roller's lot, y'know! And I have to admit I have spent far more than I ever anticipated. But still cheaper than out playing golf (if not so healthy lol!).

 

Quote:
Originally Posted by sgbwill2 View Post
 

Thanks I think i will play it safe then and get the c3g's

 

You will not be disappointed, mon ami. And with the Siemens NOS 'S' versions going for about $70 on ebay, I don't think you will find a better deal...the (20V) C3m seems to have now jumped up in price and certainly is not worth bothering with at current prices.

 

Happy hunting and rolling...

 

 

 

And finally I know you must all be getting fed up with my ravings, but after a few hours' burn-in of my new adapter, the two 6AS7Gs are forcing me to write that I cannot OVERstate the difference they are making. The shift to another level is at least equal to the C3gS phenomenon... Do I now have a MK9? Hey, even that doesn't have the C3g!  This MKIV SE is now a TOTALLY different animal to even a few months ago, when we were a good way on from original stock. All the trials - not to mention tribulations (and expense!) - have been worth the journey. Not to mention the wonderful camaraderie along the way, with some great guys.

So whichever direction you take, mes amis, I can only hope you experience the sense of wonderment and sheer joy I am currently enjoying...way beyond my expectations.

 

HAPPY ROLLING EVERYONE :beerchug:

post #6129 of 10486

Hey guys, I have just started my tube rolling journey with the LD mk3 and I am a bit confused to whether these are genuine or not? Also, the seller is stating quite a few figures that I dont understand...

So.. was wondering if I could find some help from you experts :p

 

 

It is the Voskhod 6ZH1P-EV EF95 I am after..

 

http://www.ebay.co.uk/itm/2-matched-6J1P-EV-EF95-6AK7-Gold-Platinum-grid-NIB-/130950289707?pt=Vintage_Electronics_R2&hash=item1e7d3ed92b

 

http://www.ebay.co.uk/itm/2-matched-Gold-pins-Gold-Platinum-grid-6J1P-EV-EF95-6AK5-6AK7-NEW-NOS-NIB-/131032948276?pt=Vintage_Electronics_R2&hash=item1e822c1e34

 

 

thank you guys!

post #6130 of 10486
Quote:
Originally Posted by philiptw View Post
 

It is the Voskhod 6ZH1P-EV EF95 I am after..

 

 

These ones here are genuine, I dont think there are any 6Ж1П-ЕВ fakes as they would not be worth replicating...

http://www.ebay.com/itm/2x-MATCHED-6J1P-EV-VOSKHOD-70s-TUBES-GOLD-GRID-6J1P-EF95-6F32-6AK5-PAIR/310952351749

 

And a pair of these to go with...

http://www.ebay.com/itm/6HM5-6HA5-EC900-export-quality-audio-triode-tube-NOS-FREE-SHIPPING-/300879467071

 

:beerchug:


Edited by TrollDragon - 5/13/14 at 1:35pm
post #6131 of 10486
Quote:
Originally Posted by TrollDragon View Post
 

 

These ones here are genuine, I dont think there are any 6Ж1П-ЕВ fakes as they would not be worth replicating...

http://www.ebay.com/itm/2x-MATCHED-6J1P-EV-VOSKHOD-70s-TUBES-GOLD-GRID-6J1P-EF95-6F32-6AK5-PAIR/310952351749

 

And a pair of these to go with...

http://www.ebay.com/itm/6HM5-6HA5-EC900-export-quality-audio-triode-tube-NOS-FREE-SHIPPING-/300879467071

 

:beerchug:

 

Thank you! ^_^ 

 

I intend to keep the RTC 5654 as backup tubes~

Already looking forward to that Voskhod!

post #6132 of 10486
Quote:
Originally Posted by hypnos1 View Post

 

Hi mordy. Thanks. But hey, it's not too difficult to alter the 6Cg7 adapter to take the 6AS7/6080 as power tube. With the MKIV, and no extender necessary once all the brass bits are removed, it just needs pins 4 and 5 cut with enough left to solder the new power supply wires, then covered with tape. I found that worked perfectly (obviously they mustn't project too far out!). If socket extenders are needed (I'm assuming they are available for 8-pin to LD's 9-pin?), the wires could be wedged in atop the extender and its pins 4 and 5 at the LD cut off completely.

Well, so I think anyway, mordy...

 

Thinking about this a bit....

 

Some of us might remember disassembling 7-pin socket-savers and using solder and wire to connect various pins together to allow us to strap 6AU7's and heptodes for use in our LDs. Looking at Hypnos1's custom-made 6AS7 adapter suggests to me that something similar could be done to allow the use of 6AS7's.  First, disassemble a 9-pin socket-saver and drill a hole in the housing to allow two heater wires to pass through. After that, solder wires to pins 4 and 5, which will later be connected to an external PS. Once done, reassemble the saver, routing the wires out through the drilled hole. Once assembled, cut off pins 4 and 5 at the bottom of the saver. Plug the socket savers into the LD and connect the wires to the external heater PS.  This should work! :)

post #6133 of 10486
Quote:
Originally Posted by philiptw View Post
 

 

Thank you! ^_^

 

I intend to keep the RTC 5654 as backup tubes~

Already looking forward to that Voskhod!

The RTC's have got good treble extension (at least with my LD 3 and to my ears) and Voshkods are truly bass monsters!

post #6134 of 10486

Received this little treasure the other day: An E80CC manufactured in Hamburg, Germany, October, 1956 (WK2 D6J). It has a horseshoe getter and pinched waist. However, the pinching is not as deep and well-defined as it is on my 1955 Eindhoven tube. I got it for $45, shipped from Germany, which isn't too bad when you consider a pair of C3g's go for around $75. Like the C3g, the E80CC is an ultra-linear, frame-grid tube. And in fact, it has a signicantly lower distortion figure than the C3g. (That is, when we strap the C3g, to convert it from a pentode to a triode, the distortion increases to a level approaching that of a 6SN7, still quite low, but not as low as the E80CC.)

 

Have spent a few hours with this tube, and in my opinion, this is right up there with the C3g, top-tier.

 

post #6135 of 10486

Hey guys...a word of WARNING, if anyone is thinking of buying the 8A voltage regulator/converter I posted a while ago.

 

After a near heart attack when the gorgeous glow from my 6AS7Gs disappeared - I always assume the worst! - it turned out to be said cheapo chinese converter. At £4.99, incl shipping, I should have known better. Mind you, with the possible high initial surges from the 6AS7Gs I suppose it isn't really fair on the poor thing! Probably, all would be well using 2 of same :rolleyes:...

 

Might just bite the  bullet and get a proper unit, now I know it would be well worth the investment, lol.

 

Cheers

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Headphone Amps (full-size)
Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › Little Dot Tube Amps: Vacuum Tube Rolling Guide