Tube Rolling w/Crack

Dr. Toobz · 753359

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Offline Paul Birkeland

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Reply #1290 on: November 11, 2015, 06:26:14 AM
It's a bit of a slippery slope when you have a forum like this and you allow trading.  The one time Doc B will allow it is when somebody would like to sell a kit they have to upgrade to a new one.

Having said that, here is a place where you could likely find what you're looking for:
https://groups.yahoo.com/neo/groups/BHExchange/info

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline moriez

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Reply #1291 on: November 12, 2015, 05:58:09 AM
Oh ok. Didn't know and didn't read the rules if there are any. In my opinion there'd be nothing wrong with having,  if it need be a subforum that allows for trades. Have this-Want that kind of thing. No biggie though. It's probably not worth our energy to discuss as there are enough other options out there.

Cheers  ;)


Offline fullheadofnothing

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Reply #1292 on: November 12, 2015, 08:21:43 AM
The forum rules are the first section of the forum...

http://bottlehead.com/smf/index.php?board=11.0

Joshua Harris

I Write the Manuals That Make The Whole World Sing
Kit Packer Emeritus

Offline Tom-s

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Reply #1293 on: November 17, 2015, 07:31:41 AM
Quote from: JamieMcC on October 26, 2015, 10:49:09 AM
You can have lots of fun with 6sn7 and 6F8G  variants there are some great sounding tubes but you will need the relevant xyz to 12au7 socket adapter.

Thanks Jamie! Using your advise i bought my first NOS tubes for the crack :D Let's start rolling.
Using this advise i now have a 6sn7 1578 tube in transit (but already got the adapter).
For the 6F8G i found a pair of Tung Sol black glass round plates (but for those i'm still waiting on the adapter).
Can't wait to get these going. Any tips on optimizing the crack for this sort of tubes?


Offline Wizzie

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Reply #1294 on: November 19, 2015, 12:48:24 PM
Need a little help identifying a 12au7 tube that came with my crack kit

any feedback would be appreciated

Thanks



Offline Ju29

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Reply #1295 on: November 24, 2015, 03:06:14 AM
Hi everyone,

I have to possibility to try a 12Bh7 tube (12BH7A Raytheon from the 50s) with my Crack (with speedball installed).
Before doing this I just wanted to be 100% sure if it was safe.

So here is my question : Does a 12BH7 tube work properly with a Crack (with speedball) OR does it need more mods to run ?

(For now I have the 6080 stock installed but will plan to try the 12BH7 with a TS 5998 that is on its way).


Sorry if it has been discussed on the older posts. I made my researches but I still have a doubt about it...

Thanks for your answer ! :)


Offline Lee Hankins

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Reply #1296 on: November 24, 2015, 04:18:29 AM
According to the post Tube Rolling w/Crack (which has been read 230,518 times; an amazing number) the 12BH7 is "Sort-of-a-Drop-In (but not equivalent - for best results, replace plate resistors with Speedball boards)".  It just means that the 12BH7 will work but may sound better if one installs a proper valued plate resistor.  I have had no problem tube rolling and listening to the 12BH7, very nice sounding tube even without changing the plate resistor.

I have considered installing a switch that would allow the use of the stock and 12BH7 resistor, but didn't think it was worth the effort, the 12BH7 can be an extremely good sounding tube in the Crack.

Lee Hankins
"End of the Road"
Homer, Alaska

Offline Ju29

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Reply #1297 on: November 24, 2015, 04:50:21 AM
Yeah the first page of the Tube Rolling w/Crack is one that I refer the most. :) I wasn't sure about the meaning of "drop in" + about the plate resistors change (if that meant only to have the speedball update installed or if that meant to have to SB installed+others resistors mods on the SB).

I don't know if I'm clear about what was unclear in my mind.. But anyhow with your answer you confirm me it's safe so I'll try the 12BH7. Thanks ! :)


About the switch, I think it probably will take me too much time only to understand what I should do so. So not really an option for me... ;)

Thanks again


Offline Maxhawk

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Reply #1298 on: November 25, 2015, 05:29:04 AM
It would help if you could provide photos that clearly show the markings. It's difficult to tell by the internal construction alone.


Rob Cheng

Offline Wizzie

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Reply #1299 on: November 25, 2015, 08:02:17 AM
Quote from: Maxhawk on November 25, 2015, 05:29:04 AM
It would help if you could provide photos that clearly show the markings. It's difficult to tell by the internal construction alone.

Thank maxhawk

However the printing on the tube itself is difficult with the naked eye

The writing reads on the 1st line is 12, 2nd reads AU7A and 3rd reads U.S.A.

There are no other marking on the tube


Offline Lee Hankins

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Reply #1300 on: November 25, 2015, 08:26:51 AM
It is a GE tube.

Lee Hankins
"End of the Road"
Homer, Alaska

Offline Wizzie

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Reply #1301 on: November 26, 2015, 05:06:31 PM
Thanks heaps lee


Offline Rhok

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Reply #1302 on: November 28, 2015, 05:35:56 PM
Looking for tube identification, as I keep spending money on various 12AU7 tubes and keep going back to the one that shipped with my kit.

Those are the only markings on it.

It definitely looks like a GE - but what kind?


Offline Lee Hankins

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Reply #1303 on: November 28, 2015, 06:24:44 PM
It is a GE tube.

Lee Hankins
"End of the Road"
Homer, Alaska

Offline Wizzie

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Reply #1304 on: November 28, 2015, 07:09:41 PM
I think Lee is on fire


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