![]() The 990s sound so good through the Crack, they have replaced the. What surprised me though, is how good it makes my Beyerdynamic DT-990s sound. 0 Comments I recently built a Bottlehead Crack for my HD650s and ran it for a month before putting the Speedball in. The original Crack headphone amp is a high output Z, cathode follower, OTL topology that has garnered. The Crackatwoa is an upgraded model of Bottlehead's popular DIY Crack OTL headphone amplifier with a larger power transformer, shunt-regulated power supply, multiple inputs, and optional addition of a Bottlehead's TwoQuiet stepped attenuator. It is not loud, but can be heard without playing music. Unfortunately, the dreaded left channel hum came along for the ride. darkvoice 336se vs bottlehead crack upgrade I recently heard the Crack with the Speedball upgrade as well as an upgraded pot and it was much better than stock however, a 5998 tube was also being used, which generally gives a stronger, more forward sound with quite a bit more gain plus weight to overall signature. The Tung-Sol completely changed the sound! It sounded so rich and open. Bought the Tung-Sol to replace the factory Shuguang tube on my Darkvoice 336SE.
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