[TrollDragon]

Hi all, I just received a second hand Little Dot MKii and the previous owner included a few different tubes. I had already ordered a set of Voshod 6ZH1P-EV preamp tubes.

In the meantime time, I spent some time listening with the tubes furnished by the seller which include GE Jan 5654w preamp tubes and 6h6n power amp tubes of unknown manufacturer.

My impression was very good but I felt that the bass was a little boomy and uncontrolled.

Should I expect my incoming preamp tubes upgrade to help with that or should I be looking to upgrade these power tubes as well?

Which headphones are you using with the MK2?

 

[Ad720]

Which headphones are you using with the MK2?

HD6xx and DT880 (250 ohm) mostly. The rest of my collection are all lower impedence.

 

[Anomalia]

OTL amps like the LDMK2/3/4 are not really designed to work well with low Z headphones, there is a bass roll off because of the low resistance.

Hybrid amps like the LD I+ are better suited for low Z.

Hifiman + LD is great sounding combination. There is no bass roll off and there is power more than enought. OTL is not designed for these, but in this case perfect match!

If I remember right only he400 series sounds great using LD.

 

[Ad720]

Can anything help identify these power tubes?

 

[gibosi]

Not sure exactly what information you are asking for... They appear to be 6N6P, a fairly common Soviet tube. However, I am inclined to think that these might actually be Chinese-made

http://www.sovtube.com/tubes/282-6n6p.html

https://frank.pocnet.net/sheets/113/6/6N6P.pdf

 

[mordy]

Not sure exactly what information you are asking for... They appear to be 6N6P, a fairly common Soviet tube. However, I am inclined to think that these might actually be Chinese-made

http://www.sovtube.com/tubes/282-6n6p.html

https://frank.pocnet.net/sheets/113/6/6N6P.pdf

Here are pictures of the logos of Russian vacuum tube manufacturers - none of them look like the logo with the star on the tubes of AD720.
http://www.ominous-valve.com/russtube.html

 

[Ad720]

Thanks..mostly I am trying to determine which of these sets are the stock tubes for the LDMkii. I'm clear that the first picture is the Soviet standard 6n6p but I'm not sure if those were the stock tubes. My guess for the second pic was something of Chinese manufacture.

 

[Oskari]

Can anything help identify these power tubes?

1987 NEVZ-Soyuz, Novosibirsk 6N6P

1980 Beijing 6N6-T (I think, the one in front)

 

[Ad720]

1987 NEVZ-Soyuz, Novosibirsk 6N6P

1980 Beijing 6N6-T (I think, the one in front)

Thank you!

In the second picture the markings on the tubes are identical, however the markings are printed in opposite directions of each other.

So, in your opinion, would it be safe to say that neither of these sets are original to the MKii? I'm using the NEVZ-Soyuz now and I'm pretty happy with them but I have been researching power amp tube upgrades.

 

[Oskari]

So, in your opinion, would it be safe to say that neither of these sets are original to the MKii? I'm using the NEVZ-Soyuz now and I'm pretty happy with them but I have been researching power amp tube upgrades.

I see Beijing tubes in the photos.

• https://www.littledot.net/forum/viewtopic.php?f=9&t=816

 

[Ad720]

I see Beijing tubes in the photos.

• https://www.littledot.net/forum/viewtopic.php?f=9&t=816

Thank you!

 

[mordy]

Thank you!

Hi Ad7,
I do want to point out that the manufacturer of the amp and the user of the amp have different goals when it comes to choosing tubes.
The manufacturer has to make sure that he has a good supply of tubes on hand and that of course it sounds good. Most tube manufacturers are long gone, and the only tubes available in quantity are from Russia and China.
An individual user only need a couple of tubes, and can therefore pick from many choices of old discontinued tubes which oftentimes sound better than the OEM tubes supplied.
Based on the above I would not be concerned about getting the same tubes that the manufacturer supplied, especially since many times the manufacturer switches between different tubes, depending on what is available and price etc. .

 

[Ad720]

Hi Ad7,
I do want to point out that the manufacturer of the amp and the user of the amp have different goals when it comes to choosing tubes.
The manufacturer has to make sure that he has a good supply of tubes on hand and that of course it sounds good. Most tube manufacturers are long gone, and the only tubes available in quantity are from Russia and China.
An individual user only need a couple of tubes, and can therefore pick from many choices of old discontinued tubes which oftentimes sound better than the OEM tubes supplied.
Based on the above I would not be concerned about getting the same tubes that the manufacturer supplied, especially since many times the manufacturer switches between different tubes, depending on what is available and price etc. .

Totally. I just wanted to figure out what I had to here in my hands before I jump into the upgrades.

 

[Johnybuchar]

Can you recommend some interesting tubes 5654/6AK5 which shouldn't missed in my collection (excluding senseless expensive), please? I have the collection: Mullard 8100, Tesla 6F32, Voshgod 6zh1p-ev, JAN 5654W, Sylvania 5654W blackplate(Green print),RAYTHEON JAN 5654 Black Plate, 5Star, RCA 5654, Yugoslavia EI 6hm5 EH900 small. My favorite are Sylvania, Voshgod, Tesla 6F32.. I am looking for Siemens . I like tube collection as well bottles of wine .

 

[mordy]

Can you recommend some interesting tubes 5654/6AK5 which shouldn't missed in my collection (excluding senseless expensive), please? I have the collection: Mullard 8100, Tesla 6F32, Voshgod 6zh1p-ev, JAN 5654W, Sylvania 5654W blackplate(Green print),RAYTHEON JAN 5654 Black Plate, 5Star, RCA 5654, Yugoslavia EI 6hm5 EH900 small. My favorite are Sylvania, Voshgod, Tesla 6F32.. I am looking for Siemens . I like tube collection as well bottles of wine .

Try some Tung Sol tubes