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RE: Headphone amp

173.70.70.182

In Reply to: RE: Headphone amp posted by dbphd on November 29, 2024 at 16:10:01

I still love the Bottlehead Crack/Speedball with the 800's. It's a single-ended triode output transformer-less amp for high impedance headphones. Use the standard (and affordable) 6080, or add a cool factor with a Western Electric 421A.

Bonus: there's plenty of room to add a Corda Crossfeed circuit. (Many thanks to Meier Audio for publishing the schematic.) Bonus #2: Bottlehead and its very active user forum provide wonderful customer support.
WW
"Put on your high heeled sneakers. Baby, we''re goin'' out tonight.

Edits: 12/05/24

Follow Ups:

what is the minimum impedance - Leo loves music 16:30:12 12/05/24 (3)
the Crack can drive?
- Think about 200 ohms and up... - peppy m. 17:23:24 12/05/24 (2)
  ...
  - Bottlehead Crack impedance recommendations (Open in New Window)
  - RE: Think about 200 ohms and up... - Leo loves music 17:53:10 12/05/24 (1)
    - That article was from 2010... - peppy m. 19:26:16 12/05/24 (0)
      Actually, it started out with a 100 ohms minimum recommendation. Revised to 120 ohms minimum, and revised again (By amp designer "Doc" himself) to a recommended 200 ohms minimum - for best sound...
      The amp will work with 100 - 600 ohm headphones, but higher is better. Output impedance of the Bottlehead Crack is about 120 ohms.
      
      Edits: 12/05/24 12/06/24

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