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Little Dot I+ Tube Rolling - Page 134

post #1996 of 1999

Who knows if the 6BK7 tube is compatible?

post #1997 of 1999
Quote:
Originally Posted by forestitalia View Post
 

Who knows if the 6BK7 tube is compatible?

 

The 6BK7 is a double triode. That is, there are two triodes inside one tube. And therefore, one could say that a 6BK7 is similar to having two 6HM5's inside one tube. And such a tube requires more than 7 pins. The 6BK7 has 9 pins, similar to a 12AU7. So no, you cannot purchase two of these and plug them into your LD1+.

 

However, it is possible to use double triodes in an LD1+.  But in order to do so, it is necessary to cobble together an adapter of some kind....  Something like this.....

 

post #1998 of 1999
Quote:
Originally Posted by gibosi View Post
 

 

The 6BK7 is a double triode. That is, there are two triodes inside one tube. And therefore, one could say that a 6BK7 is similar to having two 6HM5's inside one tube. And such a tube requires more than 7 pins. The 6BK7 has 9 pins, similar to a 12AU7. So no, you cannot purchase two of these and plug them into your LD1+.

 

However, it is possible to use double triodes in an LD1+.  But in order to do so, it is necessary to cobble together an adapter of some kind....  Something like this.....

 

Thanks, your explanation is clear as usual. Im trying to read about tubes but is quite complex, in this page is possible see specification and at least I understand how many pins: http://www.shinjo.info/frank/sheets0.html .

However many reviews says that 408A is better because of the higher voltage, what think?

post #1999 of 1999
Quote:
Originally Posted by forestitalia View Post
 

Thanks, your explanation is clear as usual. Im trying to read about tubes but is quite complex, in this page is possible see specification and at least I understand how many pins: http://www.shinjo.info/frank/sheets0.html .

However many reviews says that 408A is better because of the higher voltage, what think?

 

The fact that the 408A has 20 volt heaters makes absolutely no difference. There are excellent 6.3 volt tubes, 12.6 volt tubes, 20 volt tubes and 25 volt tubes. In the end, it comes down to your ears, your headphone and your amp.

 

I have never heard a 6BK7. However, there are other double triodes I have heard in my LD1+, and too my ears, 6SN7's, 5687's and 6DJ8's are substantially better than a 408A or a 6HM5.

 

Cheers

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