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And no, I don't need you to reimbursement for this since I got a tooth cleaning out of it. are welcome.ĭrove 150 miles roundtrip to dentist appointment and also to pick up a speaker and return one.

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But if you want to go with the Bottleheack Crack amplifier kit, I understand and won't hound you!Īs always, questions, comments, recommendations, etc. Personally I would use EQ to correct the bass response of the HD-650 and use a powerful solid state amplifier to drive it.

I hope the new owner has an HD-650 type headphone in which case he will be happy. Other headphones though produced everything from unusable to 'what did I buy this tube amp for?' As it turns out, these factors work in favor of Sennheiser HD-650 producing beautiful tonality and music. However it also points to lots of power availability and potential for modification of frequency response of the headphone. Objective performance shows severe problems.

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This is a nice tube headphone amplifier kit and the built version is a good example of how to do it right. Available power was not that great but usable. While it was hard to tell in my quick testing, I thought the sound was a bit distorted. Neither of these got the beneficial frequency response. I also tested with AKG 371 and Sony MDR-7506 headphones. Whoever thinks distortion of this type is pleasant should listen to this combo. The high impedance of Crack meant that hardly any power was delivered to the amplifier and what was there, was at max volume with ton of distortion. The Ether CX has a low impedance of 25 ohm and is very inefficient to boot. It was a good thing I did not start testing with Drop Ether CX as it was a total disaster: almost no output and what was there was severely distorted. That means a lot of bass notes are amplified more due to high impedance of the Bottlehead Crack changing the response of HD-650. The amp will be carefully packed with plenty of cushion and foam.īuyers will have 30 days to return the amp.The response is almost identical above 500 Hz but below, there is a broad lift to the tune of 1 dB. Let me know if you need a voltage other than 120V (US) and I can modify this for you during the building process. If you have any questions or concerns, please do not hesitate to contact me. The music really shines with live or acoustic music. The Bottlehead Crack is an exceptional headphone amp that pairs well with high impedance headphones such as the Sennheiser HD 650's and the HD 800's. Finally, I've listened to the amp with my own set up to ensure it was in proper working order. The resistances and voltages were then tested and passed all tests. Each terminal was carefully inspected to ensure that all joints were properly soldered. The wiring for this amp was done neatly to provide a pleasing appearance. It was then finished by hand with special oil with increasing grits of sandpaper between coats to get an ultra smooth finish. The chassis, transformer, and screws were painted with metallic paint. It is built to last.Ī great amount of detail was put into this Bottlehead Crack headphone amplifier.

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With this type of solder you will not have to worry about cracked joints later in the amp's use. This solder is top of the line and contains silver for higher conductivity. Includes Bottlehead Badge, Stock Vacuum Tubes, and Power CordĬardas quad eutectic solder is used for all my kits.

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I no longer have any kits in stock so you would need to buy the amp directly from Bottlehead and get it shipped to me directly, or I can purchase it for you + PayPal fee.īottlehead Crack 1.1 with Speedball Upgrade *120V (US)

*****MADE TO ORDER***** 2 week turnaround time

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