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Crack;Bottlehead OTL
Jan 25, 2014 at 4:45 PM Post #3,632 of 12,347
bigfatpaulie said:
  ROP-IN EQUIVALENTS

Input Tubes (Original: 12AU7)

12AU7(A)(WA)
ECC186
ECC82
ECC802(S)
E8025
E82CC
CV4003
CV4122
CV491
5814(A)
6189(W)(WA)
6680 (WL6680)
6067
7489
7316
5963 (computer version of 12AU7)

Sort-of-Drop-In (but not equivalent - for best results, replace plate resistors with Speedball boards)

E80CC
12BH7

Power/Output (Original: 6080)

6AS7G
6080
6H13C
5998
7236
6N13
 
I stole that from a great thread on the Bottlehead forum.  It's well worth a read.
Click to expand...


Link to the thread?
 
Jan 25, 2014 at 5:04 PM Post #3,633 of 12,347
dutchgfx said:
  Can I substitute in a 5U4GB, a 6BL7, a 6SR7GT, a 6SK7GT, or a 6SN7GTB into the power tube slot on my Crack? I was at an antiques store and bought a box of tubes for $40, these all fit, but not sure if they are substitutes.
 
Also, for the smaller tube (input?)
Will these fit?
6R39
12AT7
6AU6
6CB6
6C4
Click to expand...


The 6SN7 can function in place of the 12AU7 with an adapter, or with a metal punch and a new socket.
The amp could also be redesigned for the 6BL7 with some effort.
 
The rest of the tubes are kind of a hodge podge, thought the 12AT7 is still commonly used in other audio related tube gear.
 
Jan 26, 2014 at 12:56 AM Post #3,635 of 12,347
Just following up the above - many of us who have purchased 6sn7 adapters have been badly disappointed by resulting noise issues, so caveat emptor.  I've tried 2 different adapters, and I believe adam tried 3 in his frankencrack, and all of them introduced substantial noise - enough to really make you appreciate how dead quiet the crack is with a 12au7 or 12bh7 up front.  It has been suggested that this can be resolved by creating a battery supply for the 6sn7's heaters (which receive ac from the crack psu), but I haven't seen anyone post confirming that this worked for them.      
 
For further reference, the folks complaining of noise with 6sn7 adapters all seemed to be hd800 users, so this may or may not be less of an issue with other headphones.
 
Jan 26, 2014 at 12:59 AM Post #3,636 of 12,347
Yeah, you can buy a 6-6.3V DC wall wart (Be sure it's 300+mA), then clip the wires going from B7/B8 to the 9 pin socket, then splice in your adapter to heat the 9 pin tube.  It's also helpful to ground one of those incoming wires as well.
 
Jan 26, 2014 at 6:05 AM Post #3,638 of 12,347
Jan 26, 2014 at 5:02 PM Post #3,639 of 12,347
skeptic said:
  Just following up the above - many of us who have purchased 6sn7 adapters have been badly disappointed by resulting noise issues, so caveat emptor.  I've tried 2 different adapters, and I believe adam tried 3 in his frankencrack, and all of them introduced substantial noise - enough to really make you appreciate how dead quiet the crack is with a 12au7 or 12bh7 up front.  It has been suggested that this can be resolved by creating a battery supply for the 6sn7's heaters (which receive ac from the crack psu), but I haven't seen anyone post confirming that this worked for them.    
 
For further reference, the folks complaining of noise with 6sn7 adapters all seemed to be hd800 users, so this may or may not be less of an issue with other headphones.
Click to expand...

 
Thanks skeptic I did not know of noise issues with the 6sn7.
 
Jan 26, 2014 at 8:18 PM Post #3,641 of 12,347
shaldome said:
  Got my shipping confirmation last Friday. Now I only have to by some equipment to build it together. I am eager to do this on a weekend. :)
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Good luck! Let us know how it ends 
beerchug.gif
 
 
Jan 26, 2014 at 10:28 PM Post #3,642 of 12,347
shaldome said:
  Got my shipping confirmation last Friday. Now I only have to by some equipment to build it together. I am eager to do this on a weekend. :)
Click to expand...

When did you place your order?  Are they still backed up?
 
Jan 27, 2014 at 1:16 AM Post #3,643 of 12,347
cswann1 said:
  When did you place your order?  Are they still backed up?
Click to expand...

I also received my shipping confirmation last Friday; ordered on 25th December (Christmas present to myself).
 
Looking forward to join the club and my first real DIY project!
 
Jan 27, 2014 at 2:03 AM Post #3,644 of 12,347
lolovitch said:
  I also received my shipping confirmation last Friday; ordered on 25th December (Christmas present to myself).
 
Looking forward to join the club and my first real DIY project!
Click to expand...

 
Congrats to you as well!! You'll love it.
 
@lolovitch and @Shaldome it's worth heading over to the Bottlehead forums if you need any help with your kits. As good as the community here is, there are some real specialists for DIY stuff over there.
 
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