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Crack;Bottlehead OTL - Page 102

post #1516 of 1889
2/20/13 at 11:12pm
I don't know if it has been mentioned here yet, but there is a bit of a group buy of Chatham 2399 tubes (which the same tube as Tungsol 5998) going on in the Woo thread.
Quote:
Originally Posted by Ultrainferno View Post

I managed to get twenty 2399 Chatham/Tung sol tubes (equals 5998 Tung Sol). 4 are already spoken for so 16 are left, if you're interested pm me for prices and info.
First come, first serve. I have a USA distributor as well to save on shipping costs.

Last I heard there were still 5 left. It's a really good price on an increasingly difficult tube to find. Shoot Ultrainferno a pm if you are interested.

Apologies if this has already been brought to attention.
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post #1517 of 1889
2/28/13 at 8:39am

HI guys, I'm really enjoying the hell out of the Crack /w Speedball. Using 5998 power tube and mullard cv4003 input (the only 12au7 I own) its pretty nice.

 

I've searched and searched but couldn't find anything conclusive.  

Due to having a Jeff Korneff integrated I have many 6sn7 lying around.

I heard something about 6sn7 using more current than the 12au7, but some said it wasn't a problem

So my question is can I simply ( with no mods to the amp), just drop in a 12au7 to 6sn7 socket converter and begin to use 6sn7's?

or is this not advisable??

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post #1518 of 1889
2/28/13 at 11:25am
Quote:
Originally Posted by eantala View Post

HI guys, I'm really enjoying the hell out of the Crack /w Speedball. Using 5998 power tube and mullard cv4003 input (the only 12au7 I own) its pretty nice.

I've searched and searched but couldn't find anything conclusive.  
Due to having a Jeff Korneff integrated I have many 6sn7 lying around.
I heard something about 6sn7 using more current than the 12au7, but some said it wasn't a problem
So my question is can I simply ( with no mods to the amp), just drop in a 12au7 to 6sn7 socket converter and begin to use 6sn7's?
or is this not advisable??

Have you tried contacting Bottlehead about this?
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post #1519 of 1889
2/28/13 at 12:41pm

With the appropriate adapter, yes you can roll in 6SN7. I have tried it myself.

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post #1520 of 1889
2/28/13 at 12:56pm
Quote:
Originally Posted by eantala View Post

So my question is can I simply ( with no mods to the amp), just drop in a 12au7 to 6sn7 socket converter and begin to use 6sn7's?

or is this not advisable??

 

Not juts advisable, I recommend this. Love the 6sn7's here.

 

KP

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post #1521 of 1889
2/28/13 at 1:10pm
Quote:
Originally Posted by j123my View Post

With the appropriate adapter, yes you can roll in 6SN7. I have tried it myself.

I just ordered an adapter, good stuff , let the rolling begin..      thanks again!

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post #1522 of 1889
2/28/13 at 1:11pm
Quote:
Originally Posted by TheKillerPiglet View Post

 

Not juts advisable, I recommend this. Love the 6sn7's here.

 

KP

thanks again I been looking on ebay all day at 12au7 tubes, but luckily didnt buy any, 

I want to see how things go with the 6sn7's as I already have a bunch of them.

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post #1523 of 1889
2/28/13 at 1:26pm
Quote:
Originally Posted by eantala View Post

I just ordered an adapter, good stuff , let the rolling begin..      thanks again!


What adapter did you order?

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post #1524 of 1889
2/28/13 at 1:55pm

There are several adapters of different brand/seller you can get from ebay. Unfortunately those ships from China, so be patient.. biggrin.gif

 

To be honest, I don't quite like my crack paired with 6sn7's as much as I like it with Telefunken 12au7. Also for all the 6sn7's I have tried (mostly Tung Sols and RCAs), I always have a noise problem that increases with the volume pot, peaks at around 1/2 way through, and gone if you crank the pot further up. This happens to all my 6sn7's and none with other 12au7 tubes, so I am guessing that it might be due to the fact the crack is not designed to be paired with 6sn7... Anyone has the same issue?

 

Paired with a Telefunken 12au7 and a 5998, the crack is simply heavenly. Will find out soon how much better it gets with upgraded components. tongue.gif

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post #1525 of 1889
2/28/13 at 2:53pm

I've always been in what seems to be a very small minority when it comes to the 12AU7 vs. 6SN7 thing too, finding the 12AU7 to be a little more articulate and the 6SN7 a little too tubey for my taste. Most everyone I know prefers the 6SN7, and it looks to be a more linear tube overall in the published spec. My hunch about the rising and dropping noise floor is that it may be the additional contacts and signal path length created by using the adapter that are causing the noise, rather than the 6SN7 itself.

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post #1526 of 1889
2/28/13 at 3:10pm

Interesting. My "tubiest" setup on the Crack is 12bh7 (any brand) + RCA 6AS7G, the "least" Sylvania chrome top 6sn7 + GE 5 Star 6080.

 

KP
 

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post #1527 of 1889
3/1/13 at 6:45am

great feedback , I'd stick to 12au7's but I only have one (mullard cv3004), while having so many nice 6sn7 lying around unused.  

 

I figure $14 for an adapter might as well at least try out the 6sn7s, hopefully I get good results like killerpiglet don't get any noise floor issues.

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post #1528 of 1889
3/2/13 at 12:32am

Hello all,

 

help needed: On bypassing the 220uF 250V power cap in the Crack, I want to use the Auricap XO 2.2uF. Is the 200V vers. not enough? Is the 400V vers. too much? Can someone please break this voltage matching and allowances down for me, I can't find anything conclusive online and I'm kind of nervous from my ignorance about it. And ultimately, which voltage should I use? Thanks so much. Happy listening smily_headphones1.gif
 

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post #1529 of 1889
3/2/13 at 4:30am
Quote:
Originally Posted by larcenasb View Post

Hello all,

 

help needed: On bypassing the 220uF 250V power cap in the Crack, I want to use the Auricap XO 2.2uF. Is the 200V vers. not enough? Is the 400V vers. too much? Can someone please break this voltage matching and allowances down for me, I can't find anything conclusive online and I'm kind of nervous from my ignorance about it. And ultimately, which voltage should I use? Thanks so much. Happy listening smily_headphones1.gif
 

 

General rule is higher voltage rating will always be OK, lower voltage rating can some times be a problem.

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post #1530 of 1889
3/2/13 at 5:44pm

Thanks so much for the response -- I'll go with the 400V then, cheers
 

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