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post #556 of 888

Nope, these ones are not russian. These are gold pin 6C45's made by Electro Harmonix. The store that I ordered from is a big chain music store in Canada (Long & McQuade). They are charging me cost + a certain %.

post #557 of 888
Have you looked at the printing on the tube? I believe you will find it says made in Russia. I would guess these are the same tubes as the regular 6C45pis, but with gold plated pins and a rebranding. EH says they are a premium version of Sovtek 6C45pis. They don't say what makes them premium beyond the gold plated pins, and the Sovtek name has been used on rebranded old stock tubes as well as current production tubes. Does the gold make them sound better? I suppose it might if it improves the conductivity of the pin/socket interface. Are the tubes graded? I have no idea.

It's easy to imagine that there are still quantities of 6C45pis available in Russia and a little difficult to imagine that there is enough demand for them to justify tooling up for a new production run. But this is all speculation.
Edited by Doc B. - 4/17/14 at 9:24am
post #558 of 888

Woops, what I mean't is that these are not russian Sovtek tubes.

post #559 of 888
But they made in Russia while sound way better than Sovtek
post #560 of 888

Yes, Electro Harmonix tubes are made in russia. My original "They must be getting them hiked in by foot from the most northern peak of Alaska..." was a joke :dt880smile:

post #561 of 888
Quote:
Originally Posted by Doc B. View Post

Have you looked at the printing on the tube? I believe you will find it says made in Russia. I would guess these are the same tubes as the regular 6C45pis, but with gold plated pins and a rebranding. EH says they are a premium version of Sovtek 6C45pis. They don't say what makes them premium beyond the gold plated pins, and the Sovtek name has been used on rebranded old stock tubes as well as current production tubes. Does the gold make them sound better? I suppose it might if it improves the conductivity of the pin/socket interface. Are the tubes graded? I have no idea.

It's easy to imagine that there are still quantities of 6C45pis available in Russia and a little difficult to imagine that there is enough demand for them to justify tooling up for a new production run. But this is all speculation.

 

Ya, I though about that myself when they quoted the price. Were there any physical differences that you know about between the Sovtek and EH for NOS tubes? Something I can use to tell if the EH's I'm getting are just rebranded and their pins plated with gold??

 

Edit: Even if they are re-branded with gold plated pins, still a great deal. Prices I'm seeing online for Sovtek 6C45's shipped from US to Canada are around the $25-30 per tube range, plus shipping on top of that.


Edited by swich401 - 4/17/14 at 9:44am
post #562 of 888
I perfectly understand but looks like it takes them forever to get from Russia
post #563 of 888
It does indeed take a while to get tubes from Eastern Europe. We typically wait for two to four weeks for a shipment. New Sensor (EH and Sovtek and Mullard and Tung-Sol brand name owners) on the other hand is very responsive and we have been happily doing business with them for many years.
post #564 of 888

Finished building Mainline couple of days ago. All in all I spent almost a month on it. But I have two little kids, so I could only work for an hour or so in the evening. Taking time to read every instruction three times before actually soldering paid off: no building errors. I had a small hiccup during voltage test, but biasing the tubes solved this problem (thanks Caucasian Blackplate for amazing support).  Anyways, the amp looks and sounds just awesome. Thanks Bottlehead team for such a great product!

 

Question to HD800 owners: does it make sense to invest into a balanced cable for HD800 to use with Mainline's balanced outputs? Also, which output impedance setting you're using? I personally prefer "low" even though I'm losing some of the bass.

post #565 of 888
Quote:
Originally Posted by GeorgeNapalm View Post
 

Finished building Mainline couple of days ago. All in all I spent almost a month on it. But I have two little kids, so I could only work for an hour or so in the evening. Taking time to read every instruction three times before actually soldering paid off: no building errors. I had a small hiccup during voltage test, but biasing the tubes solved this problem (thanks Caucasian Blackplate for amazing support).  Anyways, the amp looks and sounds just awesome. Thanks Bottlehead team for such a great product!

 

Question to HD800 owners: does it make sense to invest into a balanced cable for HD800 to use with Mainline's balanced outputs? Also, which output impedance setting you're using? I personally prefer "low" even though I'm losing some of the bass.

is there Crack vs. Mainline comparison somewhere ?..wondering if it's worth upgrading 

post #566 of 888
Quote:
Originally Posted by spacequeen7 View Post
 

is there Crack vs. Mainline comparison somewhere ?..wondering if it's worth upgrading 

Well, look at the first page of this thread and you'll find it. Loquah did an extensive comparison of Crack, SEX and Mainline. 

 

I used to own Crack myself, but I sold it to fund Mainline purchase, so I haven't compared them side-by-side. From the memory Mainline has more control and detail retrieval. And it's way more versatile and convenient to use.

post #567 of 888

It's interesting that I found a balanced cable to make quite a difference with an HD600 and HD650 but not so much with an HD800. Which leaves me questioning if the differences I heard with the HD600/650 were related more to the quality of the cable itself than the balanced connection. Understand that this is coming from someone who believes in balanced wiring of loudspeakers, and I wish I could say balanced speaker cabling was a no-brainer in every situation. I think one would need to do some pretty specific comparison with exactly the same type of cable done in single ended and balanced configuration to come up with a more definitive answer. I have not done that. On the other other hand I have not experienced any situation where balanced speaker cabling sounded less good than single ended.

post #568 of 888
Quote:
Originally Posted by spacequeen7 View Post
 

is there Crack vs. Mainline comparison somewhere ?..wondering if it's worth upgrading 

 

I posted a couple of comparative comments in post nos. 43 and 46 here also: http://www.head-fi.org/t/662240/mainline-new-bottlehead-premium-headphone-amp/30

 

Hope that helps in your assessment!

post #569 of 888
Quote:
Originally Posted by Doc B. View Post
 

It's interesting that I found a balanced cable to make quite a difference with an HD600 and HD650 but not so much with an HD800. Which leaves me questioning if the differences I heard with the HD600/650 were related more to the quality of the cable itself than the balanced connection. Understand that this is coming from someone who believes in balanced wiring of loudspeakers, and I wish I could say balanced speaker cabling was a no-brainer in every situation. I think one would need to do some pretty specific comparison with exactly the same type of cable done in single ended and balanced configuration to come up with a more definitive answer. I have not done that. On the other other hand I have not experienced any situation where balanced speaker cabling sounded less good than single ended.

if you don't mind asking ..what cable are speaking of ? 

Thank you Sir 

post #570 of 888

Ah, you are putting me on the spot :wink_face:. I think the balanced cable I made for the HD600/650 was made from continuous cast copper with a Teflon insulator. The stock HD600 cable is whimpy enough that just about any other cable makes an improvement. We sold the Cardas single ended HD600 cable for a while. It was slighty modded with a right angle TRS plug and it was quite a bit better than the stock cable.

 

At Can Jam a couple years ago I got to hear the then brand new Cardas balanced cable for the HD800. I thought it was a nice if not huge step up from the quite good stock HD800 cable. Recently I built a balanced cable of my own - maybe from Mogami mic cable? Can't recall. Anyway, the difference between it and the stock cable was again not very big. 

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