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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 236

post #3526 of 7536

I think my set up is just too dark, Bifrost Uber -----> Little dot 1+  ----------> SRH 840's

 

I'm going to snatch a Magni once I get the chance, the synergy just doesn't feel right for my headphones.

 

I will continue messing around with the 1+. The Bifrost is at my friends house :(, so when the weekend comes by, I will be able to see if really want the little dot.

 

Also the 6DT6A IEC tube ran VERY hot, the pins were too hot to the touch to hold them. I'm not even going to bother with those.

 

They have nearly identical construction, the Ford tube is a little different. There are small side getters.

post #3527 of 7536
Quote:
Originally Posted by Sony Slave View Post
 

I think my set up is just too dark, Bifrost Uber -----> Little dot 1+  ----------> SRH 840's

 

I'm going to snatch a Magni once I get the chance, the synergy just doesn't feel right for my headphones.

 

I will continue messing around with the 1+. The Bifrost is at my friends house :(, so when the weekend comes by, I will be able to see if really want the little dot.

 

Also the 6DT6A IEC tube ran VERY hot, the pins were too hot to the touch to hold them. I'm not even going to bother with those.

 

They have nearly identical construction, the Ford tube is a little different. There are small side getters.

The Bifrost isn't dark by any means... neither are you 840's... you shouldn't be handling the tubes immediately after operation because they do get hot... that's normal... I'm gonna blame your source. What DAC are you using? What file quality are you using?

post #3528 of 7536
Quote:
Originally Posted by kvtaco17 View Post
 

The Bifrost isn't dark by any means... neither are you 840's... you shouldn't be handling the tubes immediately after operation because they do get hot... that's normal... I'm gonna blame your source. What DAC are you using? What file quality are you using?

I am using the Bifrost Uber as the DAC, and  optical out on the PS3.

 

My files are 320 MP3, AAC, and some flac. They were not upsampled or ripped because all of my music is downloaded from the original source of that particular artist on bandcamp.com .

 

What does the source have to do with it? I though that the Bifrost would make the source irrelevant since it overrides the DAC on that particular device?

 

EDIT: I've handled (even though I know I shouldn't) Stock tubes, Tung Sol 6AK5's, Voskods, and GE 5654W tubes after 8 hours of burn it progress. To me they were just warm to the touch. 


Edited by Sony Slave - 10/15/13 at 4:41pm
post #3529 of 7536
Quote:
Originally Posted by Sony Slave View Post
 

I am using the Bifrost Uber as the DAC, and  optical out on the PS3.

 

My files are 320 MP3, AAC, and some flac. They were not upsampled or ripped because all of my music is downloaded from the original source of that particular artist on bandcamp.com .

 

What does the source have to do with it? I though that the Bifrost would make the source irrelevant since it overrides the DAC on that particular device?

 

EDIT: I've handled (even though I know I shouldn't) Stock tubes, Tung Sol 6AK5's, Voskods, and GE 5654W tubes after 8 hours of burn it progress. To me they were just warm to the touch. 

You said the bifrost was at a friends house... When I said source I meant were you using a PC/CD's/stream/whatever.

post #3530 of 7536
Quote:
Originally Posted by kvtaco17 View Post
 

You said the bifrost was at a friends house... When I said source I meant were you using a PC/CD's/stream/whatever.

ok, the music was streamed from the hardrive.

post #3531 of 7536
Quote:
Originally Posted by MIKELAP View Post
 

Imo Its mostly subtle differences anyways.

Mostly but not always what comes to mind is that i changed over my power tubes as ive  been running  my 6N6PIR tubes for a while ,now and i put my Electro Harmonix 6H30 Pi back on hmmm dont seem to like them much anymore because i put the 6N6PIR right back on i like there warm signature better more bass which falls inline if i remember correctly with what has been said before just to say in this case its a lot more than subtle but the 6H30 Pi are very clean sounding and detailed.

post #3532 of 7536

Great guide! Thanks!

post #3533 of 7536

Hey mordy how many hours do you think your littledot lasted. You say you want to get it fixed is it worth it you think you know Christmas is around the corner, no no not meeee! Santa mordy Santa . lol

post #3534 of 7536

Hi Mikelap,

 

The Little Dot is still going strong - it turned out that it was my receiver that blew out a bunch of transistors and resistors - lost one channel and no sound to the speakers, but the headphone output works. I have the Outlaw RR2150 receiver since 2006, and I was very happy with the combination of it and the LD.

 

My friend told me that my receiver has a direct coupled amp. Little Dot does not recommend using such an amp. I had the LD hooked up via a loop for an external processor and it worked flawlessly for almost three years. I don't know what caused the amp to fail. It is going to cost me around $200 to have it repaired and they said that they would try to diagnose what caused the failure.

 

Meanwhile I am using an old Sony 1980's amp that I had lying around. It's OK, but not as good as the 2150.

post #3535 of 7536

Hey AUDIOFANBOY, and everyone else on the double triode path...

 

Re. taking advantage of both triodes : would the 6N2P family not be a good candidate for this route, being a similar spec to 12AX7 (especially with the same mu), but 6.3V and ECC88 pin-out?

And with some good reports as an ECC 83 'equivalent' (apart from V and pin-out!).

 

Just a thought...

post #3536 of 7536
Quote:
Originally Posted by Sony Slave View Post
 

EDIT: I've handled (even though I know I shouldn't) Stock tubes, Tung Sol 6AK5's, Voskods, and GE 5654W tubes after 8 hours of burn it progress. To me they were just warm to the touch. 

 

Some tubes run hotter than others. It is just the way it is and it certainly doesn't mean that anything is wrong. Part of the reason the 6AK5 / 5654 are relatively cool is that the heaters are only .175 amps, whereas, the heaters in the 6DT6A are .3 amps. I have run tubes up to .45 amps with no problems, but for sure, they run very hot. Further, if you decide to try 408A tubes, you will find that they too run very hot, with 20 volt heaters, as opposed to 6.3 heaters. But again, this is completely normal....


Edited by gibosi - 10/16/13 at 2:20pm
post #3537 of 7536

I have to tell some happy news!

 

My own designation adapter to 6v and 12v double triodes works! One tube drives both channels and i can easily change between 6v and 12v type tubes with one switch. Just listened couple of minutes JJ electronic ECC83 S tube and can't complain about sound.

 

Little dot 2 reaches another dimensions now. Tube rolling gets cheaper with only one double triode driver. not


Edited by Artsi - 10/17/13 at 2:49am
post #3538 of 7536
Quote:
Originally Posted by Artsi View Post
 

I have to tell some happy news!

 

My own designation adapter to 6v and 12v double triodes works! One tube drives both channels and i can easily change between 6v and 12v type tubes with one switch. Just listened couple of minutes JJ electronic ECC83 S tube and can't complain about sound.

 

B9A pin 9 must be grounded from both channels pin 7 with 6.3v tubes. 6N2P-EV works without, but with electro-harmonix 6922 starts humming.

 

Little dot 2 reaches another dimensions now. Tube rolling gets cheaper with only one double triode driver. not

 

This is great news!! But I want to be sure I understand correctly. All I have to do is tie tube-pin 9 to the cathode in both sockets?

post #3539 of 7536

Here's a nice picture of the little Frankenstein creation I have brought forth to show you guys. As you can see, I didn't go for the usb upgrade, so i'm using this wonderful optical cable... To be honest, looking at this pic makes me not want to sell it. I find this combination with the led lights shining into the shadows to be a very charming duo. I was running the Tung-Sols at the time, the only tubes that actually made a difference in the sound of my 840s. 


Edited by Sony Slave - 10/16/13 at 5:23pm
post #3540 of 7536
Quote:
Originally Posted by gibosi View Post
 

Rolled in a pair of Reflector 6N23P, 1969, this evening, and first impressions, these are really nice tubes. The mid range has a nice bit of warmth and sweetness which I am finding to be very enjoyable. However, this is after only 15 minutes or so, so can't really say anything about how they compare to the better-known Mullard, Amperex and Siemens ECC88.

 

I have read in the Lyr forums that the late 1960's Reflectors are superior to those of the late 1970s and early 80s. So if you decide to pick up a pair of Reflectors, I can say that these 1969 Reflectors appear to be very nice tubes.

So gibosi how are those 6N23P doing thinking of getting some. and i bidded on some Amperex 6DJ8 you suggested the other day.


Edited by MIKELAP - 10/16/13 at 5:33pm
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