This Bottlehead Crack headphones amplifier is not a new news but still hot for sure.
For some reason, this amplifier is always praised by DIY'ers as the best headphones amplifier kit available so far. Not just because it is using vacuum tube, but it is sound good.
This Bottlehead Crack headphones amplifier is sell in a kit and luckily for you living in States, this kit can be obtain with the ease. But not for me living in Asia, the delivery cost for this amplifier will high and takes so much time. This Bottlehead Crack amplifier in this post here is lend by my friend. He bought it in used condition and he is willing to bring it to my house yesterday to let me check it first.
My quick inspection, this unit is all original component, nice layout, simple design, and quite dirty for sure.
I will cleaning it up in return and maybe some cosmetic upgrade later on.
As you can see, the top plate is quite dirty. The transformer cap has some rust on it. But overall still in maintained condition.
The wood panel on side is loose to the top plate, means no any screws locking to both parts together. I also don't have any idea what should I do to attach them. I guess using glue will help.
Here in the internal components from today quick inspection. It is all tidy, it is all original except the potentiometer has been upgrade to ALPS blue.
I see some additional resistor after the potentiometer. It is 1 kilo ohm, usually for improve amplifier input stability. I will try to remove it later and return to it's original as per schematic.
Here is the original schematic.
And here are another photos that I was taken during this inspection.
Please continue to the Part-2.
Disclaimer: Any statement and photos in this article are not allowed to copy or publish without written permission from the writer. Any injury or loss from following tips in this article is not under writer responsibility.
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