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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 390

post #5836 of 10500

Hi I luvmusic 2,

 

Congrats or your new adapter box!. My only suggestion is to label all the sockets (and switches) so that you don't make mistakes when inserting different tubes or switching voltages etc. Something tells me that you may want to wait with the finish until you have finalized the design (provision for 2c51/5670 tubes?).

post #5837 of 10500
Quote:
Originally Posted by mordy View Post
 

Hi I luvmusic 2,

 

Congrats or your new adapter box!. My only suggestion is to label all the sockets (and switches) so that you don't make mistakes when inserting different tubes or switching voltages etc. Something tells me that you may want to wait with the finish until you have finalized the design (provision for 2c51/5670 tubes?).

  Thanks for your suggestion!In the back of the box there is a TERMINAL BLOCK  where i can only connect one adapter at once so it's less mistake connecting adapter it's semilar to switching PCB or VECTOR only one at a time and all the heater wires are all isolated no switches just Dc jack and they have a 12V Dc jack adapter i made that the plug is bigger than the one for 6V dc jack.I was going to put switch in between the adapters instead of pluging 6 wires in the terminal block but i'am worried about noise/hum issue by putting switch in between and i tried leaving the vector on the amp and plugin one adapter on top of vector adapter and it's a bit noisy specialy if i moved my hand across the amp.

   The 6SN7 power tubes are really nice and it make the MK III run cooler it doesn't even get warm it feels like it's off it's cold and i'am worried that the MK III might get frozen (no just kidding):biggrin:

post #5838 of 10500

I also noticed that the 6SN7 tubes used as power tubes don't even make the LD MKIII break out in a sweat - runs really cool, which I think is good.

 

In the never ending quest for audio truth I have being trying out different combinations of octal tubes. I am trying to the answer the question:

Do power tubes matter?

 

The answer is yes. I decided to use some of the poorest sounding 6SN7 tubes I have (based on using them as driver tubes). Put in a near pair of two GE 1950's tubes, and used a good performing Tung Sol 6SN7GTA as driver. This TS tube is a real midget with a short glass envelope. Although I prefer a tall tube as driver I decided not to discriminate and give the little guy a chance.

 

The main problem with the sound was the bass. Flabby, muddy, without good control of the low frequencies and a dull almost lifeless presentation.

 

So my conclusion, which is also based on comparing the 6N6P family tubes as power tubes, is that the main difference with different power tubes is the control of the bass and the quickness and slam of the presentation. I am not stating this as an absolute, but at this point I am inclined to think that this may be correct IMHO. (If you think otherwise, I am interested to know.)

 

Could not stand the GEs, so I popped in a near pair of '53 and '55 RCA 6SN7 tubes. This TS/RCA combo is OK with the only complaint too much sizzle in the treble. Maybe it will go away after using the tubes for a while; you'll never know with these used bargain tubes. With a NOS tube you can count on it changing for the better after burn in, but here I just don't know.

 

Well, I found out. LOL; even after extended playing the treble was too sharp. Put in the tried and true RCA heater wire on top of mica tubes, and popped in the Japanese Channel Master as driver, and all is well again.

post #5839 of 10500

Anyone with suggestions of tubes to try with the Mk III for pairing with a HD800?

post #5840 of 10500
Quote:
Originally Posted by Rossliew View Post
 

Anyone with suggestions of tubes to try with the Mk III for pairing with a HD800?

 

Everyone's ears are different. What one person likes another doesn't, even with the same headphones and amp....

 

I don't have the HD800s, but I have been able to spend a little time with them. In my opinion, the very clinical and analytical nature of the HD800s pairs very well with a rather warm tube with strong bass. So I would suggest a pair of RCA 6DT6. Set your LD to use EF92 tubes, and they are plug and play. And fortunately, they are normally inexpensive, so if they aren't to your taste, you haven't lost much.
 

post #5841 of 10500
Quote:
Originally Posted by gibosi View Post
 

 

Everyone's ears are different. What one person likes another doesn't, even with the same headphones and amp....

 

I don't have the HD800s, but I have been able to spend a little time with them. In my opinion, the very clinical and analytical nature of the HD800s pairs very well with a rather warm tube with strong bass. So I would suggest a pair of RCA 6DT6. Set your LD to use EF92 tubes, and they are plug and play. And fortunately, they are normally inexpensive, so if they aren't to your taste, you haven't lost much.
 

Thanks G and I agree with you on the differences in listening preferences. I shall look out for the 6DT6 tubes. Would Mullards be a good pairing as well?

post #5842 of 10500
Quote:
Originally Posted by Rossliew View Post
 

Thanks G and I agree with you on the differences in listening preferences. I shall look out for the 6DT6 tubes. Would Mullards be a good pairing as well?

 

Generally speaking, the best Mullards have warm bass and lower mids and smooth and liquid upper mids and highs. So yes, if you like a warm sound signature, you might like these as well. Of the "traditional" Little Dot tubes, the Mullard EF92 are a classic example.

post #5843 of 10500
Quote:
Originally Posted by hypnos1 View Post
 

Hey there mikelap...how are things with the Woo? Am sure I'm not the only one eager to hear how it compares to the LD!

 

Hope you can give us the low-down sometime soon...

Tonight i listen to the Littledot it had been a while,  i used  a 6SL7 octal tube with octal adapter and Electro Harmonix 6H30PI gold pin power tubes and my first impression is that the Woo has a fuller warmer sound also more bass using a pair of Russian 6N13S/ 6AS7 as  power tubes .   Littledot seems thinner sounding  and thats with the Senns HD800. but Littledot is no slouch it does the job.  One other thing if i would of used  the Russian 6n6pir power tubes they  usually sound warmer  than the Electro Harmonix                                                                                                                                                                             Processed By eBay with ImageMagick, z1.1.0. ||B2

 

 

 

post #5844 of 10500
Quote:
Originally Posted by MIKELAP View Post
 

Tonight i listen to the Littledot it had been a while,  i used  a 6SL7 octal tube with octal adapter and Electro Harmonix 6H30PI gold pin power tubes and my first impression is that the Woo has a fuller warmer sound also more bass using a pair of Russian 6N13S/ 6AS7 as  power tubes .   Littledot seems thinner sounding  and thats with the Senns HD800. but Littledot is no slouch it does the job.  One other thing if i would of used  the Russian 6n6pir power tubes they  usually sound warmer  than the Electro Harmonix                                                                                                                                                                             

 

As I believe your Woo uses 6DJ8, I would like to know how the same 6DJ8 compares in your LD. :)

post #5845 of 10500
Quote:
Originally Posted by MIKELAP View Post
 

Tonight i listen to the Littledot it had been a while,  i used  a 6SL7 octal tube with octal adapter and Electro Harmonix 6H30PI gold pin power tubes and my first impression is that the Woo has a fuller warmer sound also more bass using a pair of Russian 6N13S/ 6AS7 as  power tubes .   Littledot seems thinner sounding  and thats with the Senns HD800. but Littledot is no slouch it does the job.  One other thing if i would of used  the Russian 6n6pir power tubes they  usually sound warmer  than the Electro Harmonix                                                                                                                                                                             Processed By eBay with ImageMagick, z1.1.0. ||B2

 

 

 

 

Mike, which Woo amp did you use to pair with the HD800? And that LD tube adaptor looks killer! Is there a link somewhere as to how I could DIY that for my Mk III ? thanks

post #5846 of 10500
Quote:
Originally Posted by gibosi View Post
 

 

Generally speaking, the best Mullards have warm bass and lower mids and smooth and liquid upper mids and highs. So yes, if you like a warm sound signature, you might like these as well. Of the "traditional" Little Dot tubes, the Mullard EF92 are a classic example.

OK, noted with thanks. Shall try to experiment changing jumpers first before i search for EF92 tubes..

post #5847 of 10500
Quote:
Originally Posted by Rossliew View Post
 

 

Mike, which Woo amp did you use to pair with the HD800? And that LD tube adaptor looks killer! Is there a link somewhere as to how I could DIY that for my Mk III ? thanks

i am using the Woo audio 2 with the HD 800.  This is the schematics and the parts you need  Qty. 1 chassis mount octal sockets , Qty. 2 chassis mount 7pin sockets ,  after you will need 1m.m. dia. stock to make the 14 pins and cut them to right lenght , 2 pin straihgtners that go on top of 7 pin socket and hot glued with pins together  like picture  .Next i think i used 20 or 22 gauge stranded wire .youll need shrink wrap  to put over wires  when soldering is done and chassis you will need to align sockets in Littledot and  jb weld sockets in the copper pipes and put the shrink wrap with glue inside  over sockets  so the sockets dont come out when you pull adapter out  . picture at bottom is the pipes you will need doesnt have to be exactly like that but i recommend you get sockets first bring them to the store and check the fit because you will have to modify pipe to fit the octal socket meaning opening up hole so octal socket fits in (dremel).you will need a tester to check your connections because when looking at configuration of the  pins  pin 7 is actually pin 1 when you flip it over to  connect to Littledot so study the schematic well because i made that mistake.  .                                                                                                                                                                                                                                                                                                                                                                       Regarding chassis it is made of 3 parts theres the part for the 2- 7pin sockets but theres also a reducer sleeve in the part where octal goes so the pipe for 7 pin socket fits snuggly also i soldered a piece of pipe  to the octal pipe for the left channel . So it looks nice but its alot of work  At best i think it took at least 5 hours to do this . you can also make a 6DJ8 adapter theres less grinding for this one the socket for the 9 pin tube fits right in the pipe .Also gibosi has a nice breadboard setup if you do not want to solder and keep in simple  if you have any questions let me know ill be happy to help you out .

 

 

                                                                                                                                                                                                                                                            

 

 

 

 

 

 

 

 

 

 

 


Edited by MIKELAP - 4/14/14 at 11:36am
post #5848 of 10500
Quote:
Originally Posted by MIKELAP View Post
 

Tonight i listen to the Littledot it had been a while,  i used  a 6SL7 octal tube with octal adapter and Electro Harmonix 6H30PI gold pin power tubes and my first impression is that the Woo has a fuller warmer sound also more bass using a pair of Russian 6N13S/ 6AS7 as  power tubes .   Littledot seems thinner sounding  and thats with the Senns HD800. but Littledot is no slouch it does the job.  One other thing if i would of used  the Russian 6n6pir power tubes they  usually sound warmer  than the Electro Harmonix                                                                                                                                                                             Processed By eBay with ImageMagick, z1.1.0. ||B2

 

 

 

 

Hi mikelap. Bet you're loving your woo, you lucky thing!

 

I wonder how the LD would compare, with either my C3gSs or 6SN7s as drivers, and some good 6SN7s (or Shuguang CV181-z/Psvane CV181-T II) as powers?..I have a hunch the competition would be much hotter!!

 

Whatever, it's nice to know you haven't forsaken us all here...

post #5849 of 10500
Quote:
Originally Posted by hypnos1 View Post
 

 

Hi mikelap. Bet you're loving your woo, you lucky thing!

 

I wonder how the LD would compare, with either my C3gSs or 6SN7s as drivers, and some good 6SN7s (or Shuguang CV181-z/Psvane CV181-T II) as powers?..I have a hunch the competition would be much hotter!!

 

Whatever, it's nice to know you haven't forsaken us all here...

The Littledot is a very nice sounding amp with the 6DJ8 or 6SL7 and its probably better even with the 6sn7 you guys are using and compared to the Woo the Littledot is  no slouch with the tubes we are using and its not a night and day difference its hard to put in words let me put it like this if youd sample both amps you wouldnt say OH MY GOD what a difference not with our tubes anyway and these olden ears by the way .                                                                                                                                                                                                                                                                                                                                                                           

Quote:
Originally Posted by gibosi View Post
 

 

As I believe your Woo uses 6DJ8, I would like to know how the same 6DJ8 compares in your LD. :)

And regarding the use of the 6DJ8 in the Littledot and the Woo its pretty similar but the power tubes of the Woo  and rectifiers affects sound from what ive read and noticed . So i guess even if components are not of same quality the sound is ¨similar¨  , but will Littledot last as long as a Woo ?


Edited by MIKELAP - 4/15/14 at 12:25pm
post #5850 of 10500

In my mailbox today I discovered a pair of C3g having just arrived in the US after running away from the UK. The story they are telling is that back in the UK, they were feeling rather unloved and neglected as their owner was spending all his time with the more hoity-toity C3gs, and so they decided to make their escape. And I am very glad they did! lol :)

 

I fired them up, and yes, everything that hypnos1 has said about them is true. These are top-tier tubes. I've only had a little time with them, but the first thing I notice is that they are very clear and very musical, and similar to mab1376, I notice they are bit more forward (going only by memory) than my reference Sylvanias. This is in no way a negative. One might say that the Sylvania 6NS7W and the Siemens C3g are both top tier, but the C3g is just a "lighter shade of gray."

 

I have them plugged into my Vectors, primarily because this will make it much easier to compare them to double triodes. Of course, this essentially negates all the silver hypnos1 put into them. (And I think I can hear his groans all the way from Britain! lol) But it also creates a more even playing field for comparison purposes. Both the double triodes and the C3g are routed through the Vectors, which handicaps both equally, and if anything, the C3g with a shorter wire run to the LD, is perhaps handicapped less.

 

Even though I knew that the C3g is a Loctal, I was still shocked to see just how big these tubes are. As you can see these are not little. :)

 

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