Tube Rolling w/Crack

Dr. Toobz · 1225508

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Offline Nathan

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Reply #1065 on: January 24, 2015, 03:05:34 PM
Quote from: Thebb on January 23, 2015, 09:24:15 AM
Can someone with experience with tubes comment on which would be a better tube paired with a 5998:
- 12au7 RCA Clear Top
-12au7 Mullard

Thanks.

Mullard- but if I couldn't get a Mullard an RCA clear top is my 2nd choice. The best Mullard imo is a CV4003 which is a military version of a 12au7. Clear tops are available inexpensively.

Crack/Speedball, SEX 2.1/C4S, Bryston BHA-1

Sennheiser HD600/Cardas cable, Beyerdynamic T1 2nd Gen, Hifimam HE560/Hifiman balanced cable

Offline i luvmusic 2

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Reply #1066 on: January 28, 2015, 12:47:38 PM
Another tube that works  with the CRACK is the C3g.


Offline Jimb0

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Reply #1067 on: January 28, 2015, 03:59:38 PM
How would you compare them to lets say the 5998?


Offline Paul Birkeland

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Reply #1068 on: January 28, 2015, 05:34:54 PM
Quote from: i luvmusic 2 on January 28, 2015, 12:47:38 PM
Another tube that works  with the CRACK is the C3g.
No.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Adrian

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Reply #1069 on: January 28, 2015, 11:38:58 PM
Here are a couple valve combinations I've found enjoyable:

Mullard 6080 (rebranded Phillips - Mitcham Plant) with Mullard CV4003 (military) - very good with Beyerdynamic HPs.

GEC 6as7G with RCA 12AU7 Cleartop - excellent with HD600s (the Cleartop adds a little "sparkle" to the top end).

Adrian C.

VPI Prime w/Ortofon Quintet Black MC/Rothwell MCL Lundahl SUT/EROS/Submissive (3 output mod)/Mainline/Crack - Speedball/S.E.X. 2.1 - C4S/S.E.X. 3.0 - C4S/Paramounts - Blumenstein 2.2 Mini-Max w/DOF mod -Senn HD600/Viso HP50/Focal Elear.

Offline Jimb0

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Reply #1070 on: January 29, 2015, 11:06:02 AM
Very nice tubes Adrian. Been dreaming about owning the GEC 6AS7G one day.

I wonder how those would sound with the 7119's. I can only imagine. :)



Offline i luvmusic 2

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Reply #1071 on: January 29, 2015, 11:20:33 AM
Quote from: Jimb0 on January 28, 2015, 03:59:38 PM
How would you compare them to lets say the 5998?

I don't think if that is possible i used the C3g to replaced the 12AU7.
Sorry!


Offline i luvmusic 2

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Reply #1072 on: January 29, 2015, 11:35:49 AM
Hi Paul,
  Since i don't understand much  about electronics i can't explain why the C3g's are working well with the CRACK.
I used it to replaced the 12AU7.I really like the sound of these tubes,Someone mention that the C3g have more gain than the 12AU7 Is there any MOD i can do to run the C3g efficient?

THANKS!

(https://www.head-fi.org/image/id/6965638/width/900/height/900/flags/LL)
(https://www.head-fi.org/image/id/6965650/width/900/height/900/flags/LL)
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fcdn.head-fi.org%2F1%2F16%2F900x900px-LL-16d4d0bd_DSC_3897.jpeg&hash=0b11c3980ad422c55f93fe0514d3f6c9f2d56260)
« Last Edit: January 29, 2015, 11:48:59 AM by i luvmusic 2 »


Offline Paul Birkeland

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Reply #1073 on: January 29, 2015, 12:08:44 PM
The C3G is a pentode in a different base.  To adapt one for use in a Crack, you would have to build that adapter and triode strap the tube.  Adapters are notorious for being noisy and unreliable, and when you have loose wires going into pins, somewhat dangerous. 

In the Crack circuit, two C3G's in place of the 12AU7 will not hit the target plate voltage, and will lead to excessive dissipation in the output stage's loading devices.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline i luvmusic 2

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Reply #1074 on: January 29, 2015, 12:34:37 PM
Quote from: Caucasian Blackplate on January 29, 2015, 12:08:44 PM
The C3G is a pentode in a different base.  To adapt one for use in a Crack, you would have to build that adapter and triode strap the tube.  Adapters are notorious for being noisy and unreliable, and when you have loose wires going into pins, somewhat dangerous. 

In the Crack circuit, two C3G's in place of the 12AU7 will not hit the target plate voltage, and will lead to excessive dissipation in the output stage's loading devices.

-PB
Hi,
  Thanks for your reply!Both tubes are strapped and so far they are quiet no hum at all.Is there anything i can do to hit the target plate voltage?


Thanks!


Offline PLZ7

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Reply #1075 on: February 01, 2015, 05:19:54 PM
So I finished building my BH Crack 3 weeks ago and I'm going to install the Speedball soon as well as interested in upgrading the stock tubes.

I don't really want to change any circuitry either to accommodate new tubes...unless its absolutely worth it cause I WILL be attaching the speedball anyway so I could do it at the same time.

I have HD650's and mostly listen to harder rock (ambient music and classical are up there also)

In the limited research I've done I've seen the NOS RCA 12AU7 Clear Top, Tung Sol 5998 and CV4003 Mullard mentioned a decent amount.

Recommendations anyone? Thanks.


Offline Jimb0

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Reply #1076 on: February 02, 2015, 07:54:34 AM
All of those are good tubes and what most people would recommend. I would check out the JHY-CBS Hytron 5814a's as well. They are a variant of the 12AU7 and you do not need to modify anything to use them. One of the best I've heard paired with the Tung Sol 5998. Great separation of instruments, warmth, good sound stage, and clarity. The JHY-CBS Hytron 5814 are also much cheaper than the Mullard's (I can't compare the two because I haven't heard the Mullard's although I've heard they sound better than them). Make sure you get the one with flat black plates as those sound the best. These are the ones listed on eBay.

http://www.ebay.com/itm/HYTRON-JHY5814-12AU7-ECC82-6189-NOS-1950-BLACK-PLATE-TUBE-D-GETTER-/161549676801?pt=LH_DefaultDomain_0&hash=item259d1c7101
http://www.ebay.com/itm/PAIR-CBS-HYTRON-JHY-5814a-BEST-12AU7-Made-Blk-Plt-D-Getter-Vacuum-Tubes-8-V54-/231451459914?pt=LH_DefaultDomain_0&hash=item35e395014a

There's also this vintage one which is more expensive but I'm not sure if you'll get a better sound. All have flat black plates.
http://www.ebay.com/itm/RARE-CBS-Hytron-JHY-5814-12au7-ECC82-BLACK-plates-tube-Test-NOS-/171631998987?pt=Vintage_Electronics_R2&hash=item27f610780b

The other 12AU7 I tried were the Amperex Bugle Boys (very sweet, vintage sound) which also sounds great with the Tung Sol 5998 but the CBS Hytron 5814a's takes the cake.

James
« Last Edit: February 02, 2015, 07:56:20 AM by Jimb0 »


Offline Paul Birkeland

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Reply #1077 on: February 02, 2015, 05:57:19 PM
$50 for the CBS 5814 is insane.  We shipped many of that exact tube in Crack kits last year.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Jimb0

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Reply #1078 on: February 03, 2015, 08:02:16 AM
I know Paul. Most of highly sought after tubes are marked up so high these days.  :-\


Offline Paul Joppa

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Reply #1079 on: February 03, 2015, 08:14:43 AM
Like Uber's "surge pricing"... fashion has its costs!

Paul Joppa

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