Crack;Bottlehead OTL
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DenverW

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I found one on ebay in black (probably not as good looking as those audio note ones!) that was only about 8 bucks. Shipping worries me, estimate is currently...July. I'll just have a non-fitting knob till then :).
 
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Paladin79

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My build might give a few of you ideas on cabinet choices. This is walnut with maple splines and solid brushed copper. amp completed.jpgcopper front plate.jpg
 
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Toad_of_Toad_Hall

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My build might give a few of you ideas on cabinet choices. This is walnut with maple splines and solid brushed copper. amp completed.jpgcopper front plate.jpg
The VU meters look great! Do they add any noise to the circuit? How do you hook them up?
 
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Paladin79

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The VU meters look great! Do they add any noise to the circuit? How do you hook them up?
No noise that I can measure or hear. They go on the output stage, use a 12 v supply that I ran separately. Dual volume pots that are simple enough to install. I did another version that is outboard, uses a pre-amp out, tulip poplar with ebony inlays and splines.7B8F81E6-4088-4CC6-A3B1-51B7CBEA8D47.jpeg
 
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Paladin79

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Those amps are for friends. My next venture will be a honey locust cabinet with copper and maybe holly splines.573B3F0A-2E0F-458C-8F08-D2C1DDC563E9.jpeg
 
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Toad_of_Toad_Hall

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No noise that I can measure or hear. They go on the output stage, use a 12 v supply that I ran separately. Dual volume pots that are simple enough to install. I did another version that is outboard, uses a pre-amp out, tulip poplar with ebony inlays and splines.7B8F81E6-4088-4CC6-A3B1-51B7CBEA8D47.jpeg
Source for the meters?
 
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DenverW

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Those amps are for friends. My next venture will be a honey locust cabinet with copper and maybe holly splines.573B3F0A-2E0F-458C-8F08-D2C1DDC563E9.jpeg
Clearly I need better friends :).
 
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Paladin79

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Source for the meters?
Amazon or Ebay, they are not expensive but they can take a while to receive. I just noticed this seller and the price is very good.

https://usa.banggood.com/2-Pcs-VU-M...LMmHZ2G1UsvcJphoCZ1AQAvD_BwE&cur_warehouse=CN

It took me a while to find a hole cutter the perfect size but I have used these meters a lot and will continue to do so. I compare different headphone amps a lot and the meters are quick reference for me on signal level. IMG_1539.jpg



.thumbnail_IMG_2005.jpg
 
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Paladin79

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A classy amp ...
Brushed copper can be time consuming but I love the effect. This is the start of a top plate for my own amp.



thanksbrushed copper.jpg
 
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MRphotography

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Hey Friends!! Check it out...a quick video I did with a fun montage unboxing of the Bottlehead Crack OTL 1.1 Headphone Amplifier! I hope you dig it, I will post up more audio gear videos to the channel soon. Please consider subscribing to the channel and drop me a like on the YouTube video if you don't mind and let me know if you want to see part 2 and 3 of this video series in the comments! Have a safe and great start to your week.

MR

 
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wwmhf

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It should be continued ... until music comes out it ...
 
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Wes S

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Hey Friends!! Check it out...a quick video I did with a fun montage unboxing of the Bottlehead Crack OTL 1.1 Headphone Amplifier! I hope you dig it, I will post up more audio gear videos to the channel soon. Please consider subscribing to the channel and drop me a like on the YouTube video if you don't mind and let me know if you want to see part 2 and 3 of this video series in the comments! Have a safe and great start to your week.

MR

Hey man! Nice to see you over hear!
 
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chrisdrop

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I am quite well equipped in the headphone amp department, but, I also want to learn to build 'em. So, I'll build a Crack+Speedball to start that journey.

In terms of parts/ performance upgrades, I think we have:
  • Potentiometer - a good stepped attenuator can cost as much as the Crack, but an Alps pot seems a good balanced upgrade?
  • Resistors - Looking for thoughts here. Looks like sometimes a choke is used in place of one resistor post power-supply to reduce power noise too. Hammond? Wire-wound replacements - Mills?
  • Caps - You can spend quite a bit here. Some can also be huge. Looking for thoughts here.
  • Anything else?
Question:
I assume it is best to build it to manual spec first (no changed parts), then make changes? Is that the case? Anything worth just doing during the initial build?
 
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