Tube Rolling w/Crack

Dr. Toobz · 1225227

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Offline MIKELAP

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Reply #1560 on: March 21, 2017, 12:10:02 PM
Quote from: JamieMcC on March 21, 2017, 10:16:30 AM
I used a 6sn7 adapter in my Crack for a year or so and rolled a number of 6sn7 tubes and didnt find any that lacked volume using Beyer T1 or HD800 my adapter was essentially plug and play.  So its odds on that its either a problem with the adapter or the tube. Maybe get a inexpensive new 6sn7 to try. I do remember when looking into using the adapter myself that one or two Crack users on headfi were having noise issues with their adapters but mine worked fine from the off.
    Well i found the problem it wasnt with the adapters it was with the tube i used a Russian 6H9C tube and for some reason thats what happened i tested the tube it tested good so i tried the other Russion tube of the pair and same thing happened low volume and it also tested good  weird so after that i tried a Kenrad vt-231 and everything is perfect so i dont understand ill go check data sheet of those Russians probably the  problem is there .Thanks   

Michel Laplante

Offline Doc B.

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Reply #1561 on: March 21, 2017, 12:27:21 PM
Punctuation is always appreciated. It makes posts a lot easier to read.

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

Offline galyons

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Reply #1562 on: March 21, 2017, 12:57:24 PM
Quote from: MIKELAP on March 21, 2017, 12:10:02 PM
    Well I found the problem.  It wasn't with the adapters.  It was with the tube I used, a Russian 6H9C tube ...

Typo?  A Russian 6H9C is a 6SL7, not a 6SN7.  The Russian common 6SN7 equivalent is a 6H8C.

BTW, I used a 7N7 with a hardwired Loktal socket. Had to enlarge the hole for the Noval socket.   Hate adapters!

Cheers,
Geary

VPI TNT IV/JMW 3D 12+Benz LP-S>  Eros + Auralic Aries + ANK Dac 4.1 >Eros TH+ Otari MX5050 IIIB2 > BeePre >Paramount 300B 7N7 > EV Sentry IV-A

Thorens TD124/Ortofon RMG-212/SPU >Seduction > Smash^Up> Paramour 45 MQ >K12's

Offline mcandmar

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Reply #1563 on: March 21, 2017, 01:03:06 PM
Was going to ask that too. I have found most 6H8C tubes are noisy with AC heating, you really need to run those on DC.

M.McCandless

Offline MIKELAP

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Reply #1564 on: March 21, 2017, 03:03:58 PM
Quote from: galyons on March 21, 2017, 12:57:24 PM
Typo?  A Russian 6H9C is a 6SL7, not a 6SN7.  The Russian common 6SN7 equivalent is a 6H8C.

BTW, I used a 7N7 with a hardwired Loktal socket. Had to enlarge the hole for the Noval socket.   Hate adapters!

Cheers,
Geary
  Your right found that out when i saw the data sheet .

Michel Laplante

Offline Lawrence Ho

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Reply #1565 on: March 21, 2017, 04:42:53 PM
Quote from: Caucasian Blackplate on March 21, 2017, 06:34:43 AM
Our first preamp kit, the Foreplay, offered two dual mono volume control pots as you described.  I built several over they years, and I found it extremely tedious and difficult to ever get the channels balanced, and once they were balanced, I would never really want to adjust the volume because then I would have to start over and rebalance the channels at the new level.

Agreed. It makes adjusting volume a nightmare.
As I remembr, the guy who created the modification had imbalanced hearing.


Offline Lawrence Ho

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Reply #1566 on: March 21, 2017, 05:39:04 PM
Just got myself a chatham 6080wa (black print) from vacuumtubes.net. Their service is excellent btw.

Nevetheless I must say it is a bit disappointing because the website says tung sol chatham 6080, instead of 6080wa.
The structural is visually (also audibly, i suppose) different from 6080.

Sound is fine but sadly not what i expected. My first impression is
it sounds slow, string instruments oustanding, not as airy as mullard cv2984 or the jan rca 6080wa that came with the crack.
*And it is noisy [added 23/03]




« Last Edit: March 22, 2017, 05:02:52 PM by Lawrence Ho »


Offline elnrik

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Reply #1567 on: March 24, 2017, 07:43:14 PM
Found this site, and thought this article was a good read.   http://www.effectrode.com/signal-tubes/the-6sn7gt-the-best-general-purpose-dual-triode/

Their articles can be found here: http://www.effectrode.com/support/articles/

I also thought the "Tube Family Tree" series to be well done.

Enjoy.
« Last Edit: March 24, 2017, 07:52:41 PM by elnrik »


Offline attmci

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Reply #1568 on: April 02, 2017, 06:09:59 AM
Quote from: Lawrence Ho on March 21, 2017, 05:39:04 PM
Just got myself a chatham 6080wa (black print) from vacuumtubes.net. Their service is excellent btw.

Nevetheless I must say it is a bit disappointing because the website says tung sol chatham 6080, instead of 6080wa.
The structural is visually (also audibly, i suppose) different from 6080.

Sound is fine but sadly not what i expected. My first impression is
it sounds slow, string instruments oustanding, not as airy as mullard cv2984 or the jan rca 6080wa that came with the crack.
*And it is noisy [added 23/03]

They sell used tubes and the quality various.

Return it and try a TS 6080WB.
« Last Edit: April 02, 2017, 06:17:58 AM by attmci »


Offline calmiswar

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Reply #1569 on: April 07, 2017, 05:17:56 PM
Hello everyone, hope everyone's having a nice weekend.


I just snapped up a Tung Sol 6AS7G, what are your thoughts about it? Nice tubes?


Offline attmci

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Reply #1570 on: April 08, 2017, 02:33:04 AM
Quote from: calmiswar on April 07, 2017, 05:17:56 PM
Hello everyone, hope everyone's having a nice weekend.


I just snapped up a Tung Sol 6AS7G, what are your thoughts about it? Nice tubes?

I belive Nick's recommendations should be the first page of this topic.  Very nice review of various 6as7g  power tubes (not just for crack)

http://bottlehead.com/smf/index.php?topic=663.465



Offline MIKELAP

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Reply #1571 on: April 16, 2017, 08:12:30 AM
What is maximum heater current that it is possible to use with a stock Crack with speedball. Let's say i use a 5998 tube rated at 2.4A. heater current  could i use a 1A. tube without problem .What i wanted to try is a ECC31 NR73/1280type rated at .95A. i know it works with adapters but is it safe longterm. Thanks

Michel Laplante

Offline Tom-s

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Reply #1572 on: April 16, 2017, 09:04:40 AM
3.5 A. So yes, a 6080 (2.5A) with ECC31 (0.95A) will work.

With the 5998 you're safe.


Offline Lawrence Ho

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Reply #1573 on: April 17, 2017, 03:00:31 AM
Quote from: attmci on April 02, 2017, 06:09:59 AM
They sell used tubes and the quality various.

Return it and try a TS 6080WB.

The postage is going to cost more than the tube itself.
Not sure if they sell 6080wb


Offline Tom-s

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Reply #1574 on: April 17, 2017, 03:29:06 AM
Another safe bet is the 6H13C Svetlana's sold on Ebay.
Does look the better and sounds great.

Buying tubes is mostly like a box of cookies.


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