Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Crack-a-two-a => Topic started by: Bourney on August 21, 2022, 03:36:54 PM

Title: Crack-a-two-a with custom end bell
Post by: Bourney on August 21, 2022, 03:36:54 PM
The Crack-a-two-a is my third Bottlehead build.

I built the S.E.X. with C4S standard and the Mainline standard but with big caps.

For the Crack-a-two-a I thought I'd have a go at some minor modifications:
- custom chassis plate with single undermount inputs, undermount 4 PIN XLR (wired as TRS), all-in-one IEC/fuse/switch
- custom end bell machined from 10mm aluminium plate in 3 pieces with nylon spacers for ventilation and a recess for the Bottlehead badge. Requires a 3 inch 8-32 unc bolt. I chose a stainless socket cap. I had considered using one of those full enclosures but was unsure about heat. I can say that this version barely gets warm even after extended listening, despite being close to the 6AS7GA which puts out some heat.
- Goldpoint V47 with Spinal Tap "goes up to 11" volume index

I'm happy with how it turned out and how it sounds though I've only tried it with HD650 so far. Time to invest is something like HD800s or some ZMF.

I'm keen to build another Mainline with similar treatment but go a bit further by undermounting the tubes and eliminating the visible screws. If anyone has done something like that please share.
Title: Re: Crack-a-two-a with customer end bell
Post by: sl-15 on August 21, 2022, 03:56:31 PM
Wow, this is a nice looking one! Very unique and coherent design. What is the finish on the top plate please, it looks great.
Title: Re: Crack-a-two-a with customer end bell
Post by: Bourney on August 21, 2022, 04:11:53 PM
Quote from: sl-15 on August 21, 2022, 03:56:31 PM
Wow, this is a nice looking one! Very unique and coherent design. What is the finish on the top plate please, it looks great.

Thanks sl-15. It's an anodised finish, called 'Natural', its a matte silver.
Title: Re: Crack-a-two-a with custom end bell
Post by: larcenasb on August 30, 2022, 06:27:05 PM
Love that it goes to 11! Haha, and a very beautiful and clean look. Congrats and enjoy! :)
Title: Re: Crack-a-two-a with custom end bell
Post by: larcenasb on September 04, 2022, 05:38:43 AM
I've actually come back just to look at and admire this build. Seriously, great job and congrats. I hope you love the sound. This build is so clean, I feel like this is what Patrick Bateman's build would look like, especially with that top plate in bone, haha.
Title: Re: Crack-a-two-a with custom end bell
Post by: Loquah on September 11, 2022, 12:01:55 AM
Another one adding praise for a wonderful looking design. Those RCA sockets look neat too. What brand are they?
Title: Re: Crack-a-two-a with custom end bell
Post by: Karl5150 on September 11, 2022, 08:20:50 AM
Very nice indeed. The transformer looks even better than the can covered ones, IMO.
I have had a couple of custom top plates made with studs attached to the bottom to eliminate many of the screws - happy with the cleaner look. I've never tried under mounting tubes, but it looks like you have a handle on the software, I'm sure you'll work it out. Looking forward to pics of a maxed out Mainline incorporating the above. What about adding custom graphics? (I never mind spending someone else's money)
Karl
Title: Re: Crack-a-two-a with custom end bell
Post by: Bourney on September 11, 2022, 03:59:26 PM
Quote from: larcenasb on September 04, 2022, 05:38:43 AM
I've actually come back just to look at and admire this build. Seriously, great job and congrats. I hope you love the sound. This build is so clean, I feel like this is what Patrick Bateman's build would look like, especially with that top plate in bone, haha.

Thanks larcenasb, I had to Google Patrick Bateman as I didn't remember the character name - but as soon as I saw the answer I got the reference!
Title: Re: Crack-a-two-a with custom end bell
Post by: Bourney on September 11, 2022, 04:08:16 PM
Quote from: Loquah on September 11, 2022, 12:01:55 AM
Another one adding praise for a wonderful looking design. Those RCA sockets look neat too. What brand are they?

Thanks.

The socket housings are from Neutrik model NF2D. I swapped out the actual RCA sockets for some WBT items I had from another project. (WBT-0210 Cu RCA). Too pricey and I doubt I can hear any difference, but nice to solder and use. Had to drill out the Neutrik housings very slightly using a step drill bit, but the material is fairly soft and it is easy to achieve a neat job.
Title: Re: Crack-a-two-a with custom end bell
Post by: Bourney on September 11, 2022, 04:11:27 PM
Quote from: Karl5150 on September 11, 2022, 08:20:50 AM
Very nice indeed. The transformer looks even better than the can covered ones, IMO.
I have had a couple of custom top plates made with studs attached to the bottom to eliminate many of the screws - happy with the cleaner look. I've never tried under mounting tubes, but it looks like you have a handle on the software, I'm sure you'll work it out. Looking forward to pics of a maxed out Mainline incorporating the above. What about adding custom graphics? (I never mind spending someone else's money)
Karl
Thanks Karl. I was thinking to use the studs, glad to hear you've been there and are happy with the result, I'll give it a go. Yes, I'm keen on adding some graphics/script to the next project, let's see how I go.
Title: Re: Crack-a-two-a with custom end bell
Post by: larcenasb on September 12, 2022, 04:43:30 AM
Really looking forward to seeing your future builds, Bourney!