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Little Dot Tube Amps: Vacuum Tube Rolling Guide
Feb 27, 2015 at 8:52 AM Post #9,226 of 13,434
buldogge said:
  OK...This is getting a little annoying.
 
Two questions:
 
1) Is anyone else picking up radio signals with their C3Gs???
 
2) Have you found that the C3Gs need more gain (volume pot position) than EF95 or EF91/92 tubes on the same track?
 
TIA
-Mark in St. Louis
Click to expand...

 
Nope no problem here with radio signals and C3G'S ,as for question 2 i just tried  some 6DT6A RCA tubes with 6F8G as power tubes and for equal volume the C3g's are louder and sound way better by the way .
 
Feb 27, 2015 at 9:23 AM Post #9,227 of 13,434
^^^I think one of the C3Gs is "bad", somehow...maybe some kind of short...Doesn't happen with any other tube.  I emailed the German seller...I don't get the feeling he is gonna be very helpful, based on the last time I emailed him.
 
Does anyone have a single/stray C3G they want to part with???..or I'll buy a pair, if they prefer/need me to.
 
TIA
-Mark
 
Feb 27, 2015 at 3:09 PM Post #9,229 of 13,434
THANKS!
beerchug.gif

 
Mar 2, 2015 at 11:04 AM Post #9,230 of 13,434
Hey Guys...I have  a slightly OT/side-topic question...
 
I'm picking up a Music Hall 25.3 DAC for a great price and I'm gonna pair it with the MKIII.  It uses a single 6922/6DJ8/7308 for the output stage thru RCAs.  It also has XLR outputs (which are not true balanced) which bypass the tube (are SS).
 
So, I could run XLR to RCA cables and bypass the 6922...or...RCAs thru a single 6922 family.
 
What is a good/cheap/reasonable neutral 6922?  (assume neutral on a DAC would be wise)
 
Should I leave the coloration/tuning to the LD tube rolling and run out of the XLRs??
 
Thoughts???
 
TIA
-Mark in St. Louis
 
ps...Still looking for a C3G (or 2) if anyone has any spares!
 
Mar 2, 2015 at 12:21 PM Post #9,231 of 13,434
buldogge said:
  Hey Guys...I have  a slightly OT/side-topic question...
 
I'm picking up a Music Hall 25.3 DAC for a great price and I'm gonna pair it with the MKIII.  It uses a single 6922/6DJ8/7308 for the output stage thru RCAs.  It also has XLR outputs (which are not true balanced) which bypass the tube (are SS).
 
So, I could run XLR to RCA cables and bypass the 6922...or...RCAs thru a single 6922 family.
 
What is a good/cheap/reasonable neutral 6922?  (assume neutral on a DAC would be wise)
 
Should I leave the coloration/tuning to the LD tube rolling and run out of the XLRs??
 
Thoughts???
 
TIA
-Mark in St. Louis
 
ps...Still looking for a C3G (or 2) if anyone has any spares!Hi
Click to expand...

Hi buldogge.
 
I think I have one out of its shell and permanently adapted for use just in the LD - ie silver wires attached directly to the pins and all sealed in resin, so would look different to your other put in an adapter...if any good to you just PM me...
 
Mar 2, 2015 at 9:46 PM Post #9,233 of 13,434
Slightly off-topic but guys I need to learn something:
 
http://en.wikipedia.org/wiki/6AK5
 
From this article I figure that tubes with identical design but from manufacturers will have different designation? 
 
My LD I+ came with 6cq6 tubes, but it has "EF92" written on the boxxes. What does it mean?
 
Mar 2, 2015 at 10:32 PM Post #9,234 of 13,434
williamleonhart said:
  Slightly off-topic but guys I need to learn something:
 
http://en.wikipedia.org/wiki/6AK5
 
From this article I figure that tubes with identical design but from manufacturers will have different designation? 
 
My LD I+ came with 6cq6 tubes, but it has "EF92" written on the boxxes. What does it mean?
Click to expand...

 
Yes, identical tubes can have different designations. Generally, 6AK5 is the American designation, EF95 is the European designation, and 5654 is the industrial/military designation. The 6AK5 and EF95 were consumer-grade tubes, while 6AK5W and 5654 were more rugged, providing a longer lifetime, which was obviously important for industrial/military uses.
 
The Radio Museum web site provides more information on all the different versions.
 
http://www.radiomuseum.org/tubes/tube_6ak5.html
 
And similarly, 6CQ6 is the American designation and EF92 is the European designation:
 
http://www.radiomuseum.org/tubes/tube_6cq6.html
 
Mar 3, 2015 at 6:29 AM Post #9,235 of 13,434
So I figure that "6CQ6" and "EF92" will have the same sound characteristics? 
Or is it that the same tubes manufactured by different companies will have different sound? I'm leaning towards the 2nd theory. The "identical"-ness that we're talking about is just in terms of gains, I suppose? 
 
Mar 3, 2015 at 8:11 AM Post #9,236 of 13,434
Sorry if I am asking a noob question here but I do not know much about tubes let alone rolling them. I recently picked up an old used Little Dot II. I have been trying to find information about it, specifically the tube types that go with it. The unit that I picked up has very old tubes on it. It even looks like some of the pins inside of the tubes are snapped/disconnected.
 
I am now living in Hong Kong, so if I can find some cheap tubes here to use on the Little Dot II, I will give it a shot. Otherwise I will be going back for the summer in Toronto this year.
 
The sound that I would like to change from the current, I assume stock tubes, is less warm, more transparent, and more bass would be good.
 
Whenever I do a search, most of the information that pops up is for Little Dot MKII, which I believe is newer and better. I did come across this information from an ebay website. Is it the right information?
 

The Little Dot II has sharp, dynamic range. Low sounds are really low and highs are really loud. Bass and sound stage wasn't good at first but after 100 hrs the warm bass came through beautifully and sound stage widened incredibly. Voice is super realistic, with more body. I'm using this amp with my PC tower,  DAC and Sennheiser HD 650.

Tube Upgrade​

Look for Mullard 8100 drivers tubes if you ordered stock.


Power Tubes

6H30Pi

6N1P


Driver Tubes

Russian 6zh1P

Tung-sol 403b

Sylvania black plate 6AK5W (or WB)

Mullard 8100

Solid Sate upgrade​

NONE REQUIRED 
 

Tube Rolling​

 

 

(403A, 403b, 408a, 408b, 415A, 5654, 5591, CV4010, CV5216, CV8246, 6069, CV10442, EF95 , M8100, 6AK5, CV10100, CV8159, CV8225, CV850, 6J1, EF92, 6CQ6, CV2023, V884, VP6, M8161, CV131, 9D6, W77)

 
Mar 3, 2015 at 8:26 AM Post #9,237 of 13,434
williamleonhart said:
  So I figure that "6CQ6" and "EF92" will have the same sound characteristics? 
Or is it that the same tubes manufactured by different companies will have different sound? I'm leaning towards the 2nd theory. The "identical"-ness that we're talking about is just in terms of gains, I suppose? 
Click to expand...

 
They have the same "electrical" characteristics. However, tubes manufactured in different factories at different times often sound different.
 
Mar 3, 2015 at 6:03 PM Post #9,240 of 13,434
rayzilla said:
  Sorry if I am asking a noob question here but I do not know much about tubes let alone rolling them. I recently picked up an old used Little Dot II. I have been trying to find information about it, specifically the tube types that go with it. The unit that I picked up has very old tubes on it. It even looks like some of the pins inside of the tubes are snapped/disconnected.
 
I am now living in Hong Kong, so if I can find some cheap tubes here to use on the Little Dot II, I will give it a shot. Otherwise I will be going back for the summer in Toronto this year.
 
The sound that I would like to change from the current, I assume stock tubes, is less warm, more transparent, and more bass would be good.
 
Whenever I do a search, most of the information that pops up is for Little Dot MKII, which I believe is newer and better. I did come across this information from an ebay website. Is it the right information?
 

The Little Dot II has sharp, dynamic range. Low sounds are really low and highs are really loud. Bass and sound stage wasn't good at first but after 100 hrs the warm bass came through beautifully and sound stage widened incredibly. Voice is super realistic, with more body. I'm using this amp with my PC tower,  DAC and Sennheiser HD 650.

Tube Upgrade​

Look for Mullard 8100 drivers tubes if you ordered stock.

Power Tubes

6H30Pi

6N1P

Driver Tubes

Russian 6zh1P

Tung-sol 403b

Sylvania black plate 6AK5W (or WB)

Mullard 8100

olid Sate upgrade​

NONE REQUIRED Tube Rolling

 

 (403A, 403b, 408a, 408b, 415A, 5654, 5591, CV4010, CV5216, CV8246, 6069, CV10442, EF95 , M8100, 6AK5, CV10100, CV8159, CV8225, CV850, 6J1, EF92, 6CQ6, CV2023, V884, VP6, M8161, CV131, 9D6, W77)
Click to expand...

 
You could read through the thread and look at the table page 585. However, in short the answer is: Ignore ebay infos and for direct replacement, get a pair of 6N6P-IR as power tubes and Yugoslavian Ei tall bottle 6HM5 driver tubes. After that, there are more options via adapters. You could also buy a pair of adapters as indicated in the table and get yourself a pair of 6SN7 as power tubes. Those would probably surpass the 6n6P-IRs.
 
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