- Analog Bros.
 - Custom manufacturing and modification of tube guitar amplifiers. - Budda Amplification
- Custom tube amplification and effects for the professional guitar player.
- Demeter Amplification
- Manufacturers of vacuum tube professional audio equipment, pro audio and musical instrument amplifiers and pedals.
- iMPAMP
- Tiny vacuum tube stereo power amplifier for use with small sound sources like iPods, CD players, and laptops.
- Koch Guitar Electronics
- Manufacturer of all-tube guitar and bass amplifiers. Check out our new Tone-series guitar combos/heads/cabs and our new all-tube bass head.
- Mesa/Boogie
- Pioneers in vacuum tube amplifiers.
- Rivera
- All-tube guitar amps.
- Soldano Custom Amplification
- All-tube guitar amplifiers, including combos, heads, and speaker cabinets.
- Tony Bruno Custom Amp
- Offers Bruno Amplifiers, handcrafted custom point to point wired tube guitar amps.
- Victoria Amps
- Vintage tube amp replicas.
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