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Crack;Bottlehead OTL - Page 228

post #3406 of 6122

Is your base stained or a new wood? Just done some in Wenge and Black Walnut to try but am not sure how to finish them atm.

post #3407 of 6122
Quote:
Originally Posted by brunk View Post
 

Get a 12BH7, so long as you're getting Speedball. It's super quiet and they are actually still reasonably priced :)

 

 

Quote:
Originally Posted by FlySweep View Post
 

 

Great pic.. I dig the dark base.. and the glow of the 5998 is so damn sexy.

 

What Brunk said.. 12BH7's are renowned for having no microphonics... a great choice to have (at least one) if you've got the speedball installed.

 

I've made recco's on the 650 thread as far as input tubes go.. if you're going to be using the 650 w/ the Crack (and a 5998 for the output tube), I think an RCA "black plate" 12AU7 (or the "clear top") is a must hear combo.. stunning sound.  The Mazda CIFTE 12AU7 was bad ass with the 650, too.. great for electronica/hip hop/rock.

 

Thanks guys!! Could you provide some recommended sources?

 

How about this:

 

http://www.ebay.com/itm/RCA-12AU7-ECC82-VACUUM-TUBE-1956-BLACK-PLATE-D-FOIL-GTR-SINGLE-RARE-SWEET-223-/221330280792?pt=Vintage_Electronics_R2&hash=item3388501158


Edited by MattTCG - 1/1/14 at 4:14am
post #3408 of 6122

Off the cuff, I prefer my 1950's tung sol 12bh7 to the rca's I've heard.  For that matter, old stock tung sol 12au7's also sound great and can be had quite cheap on ebay.

 

I would describe both the 12au7 and 12bh7 tung sols as very clean, neutral tubes.  By comparison, my amperex bugle boy 12au7 and 1950's rca 12bh7 are a little warmer/less extended by comparison.  Alternatively, I hear my rca clear top and mullard shield logo 12au7's as having slightly brighter trebles than the tung sols.  I don't particularly care for my 1960's rca grey plate 12bh7 but have trouble putting my finger on exactly what it is about the sound that I find less appealing than most of the others.  

 

At the end of the day, my best advice is to buy a handful of cheap tubes on ebay and see what you like.  Tubes that read "strong" as opposed to nos are just fine.  These things are good for thousands of hours of use.

post #3409 of 6122
I am using a Tungsol 12BH7A that is rebranded as "Regency" in mine right now.

To be honest I have a real hard time hearing a difference switching the drive tubes, but this one looks the best so far haha smily_headphones1.gif. It is the one in the picture I posted last night.. Anyway all three drive tubes that I have sound good and are equally quiet. The other two I have are RCA 12BH7A long black plate and a GE 12AU7A.
post #3410 of 6122
RE the "there is a tiny bit of hum when I turn the amp up far louder than I would set it to listen to music" -

The Speedball upgrade increases the gain of the circuit and thus the noise floor will be amplified a bit more. Thus it may just hit the threshold of hearing if you turn the volume up far louder than you should for listening.
post #3411 of 6122
Quote:
Originally Posted by Doc B. View Post

RE the "there is a tiny bit of hum when I turn the amp up far louder than I would set it to listen to music" -

The Speedball upgrade increases the gain of the circuit and thus the noise floor will be amplified a bit more. Thus it may just hit the threshold of hearing if you turn the volume up far louder than you should for listening.
Got it and that makes complete sense. It's kinda what I was assuming but I was just curious if everyone else experienced the same thing. Then when my friends made a distinct hum sound and mine made a more normal shhhhhh noise sound I was thrown off since they were two very different sounding noises.
post #3412 of 6122

I know the consensus that BTH crack is amazing with the HD650, which I currently have. I plan to eventually upgrade to HD800 and the HE-500 sometimes down the road, how does the BTH crack handle those HP's?

post #3413 of 6122

^^ Won't work at all. Bottlehead sells other amps for planar magnetic hp's. 

post #3414 of 6122

But great for HD800

post #3415 of 6122
Quote:
Originally Posted by olegausany View Post
 

But great for HD800

 

x2.  To my ears, it's one of the best budget hd800 amps out there in fact.  

 

If you're looking for an absolute end game setup for hd800's (and that will also handle orthos), mainline is what you want.  It is phenomenal - except for the part where I can't tare myself away from listening at night and wind up sleep deprived and/or with wife aggro.  All in all, a nice problem to have.

post #3416 of 6122
Quote:
Originally Posted by skeptic View Post
 

 

x2.  To my ears, it's one of the best budget hd800 amps out there in fact.  

 

If you're looking for an absolute end game setup for hd800's (and that will also handle orthos), mainline is what you want.  It is phenomenal - except for the part where I can't tare myself away from listening at night and wind up sleep deprived and/or with wife aggro.  All in all, a nice problem to have.


HD800 are my end game headphones and I have no interest in orthos for my desktop setup and S.E.X. handles HD800 for me from speakers taps but I still would be interested to hear mainline.

post #3417 of 6122

Despite my love of planar magnetic hp's, the hd650 with crack could be my end game. 

post #3418 of 6122

I have to admit not reading all 3500 posts in this thread...

 

Like many, I would be using this amp close to my computer.  Are there any issues with interference from lack of shielding ("gravity mounted" wooden chassis)?

post #3419 of 6122

None that I have heard of. 

post #3420 of 6122
Nope, mine sits next to a solid state amp and the computer without any problems.
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