The following companies provide Amps for guitarists.
I would recommend The Tube Store if you need replacement tubes for your amp. The prices are very good. Their shipping prices are a bit high. So buy a bunch and save yourself a bundle (especially if you usually buy tubes from your local guitar store).
I own a Valvulator I Vacuum Tube Buffer/Power Supply from VHT Amplification. I am very pleased with what it did to improve my overall tone.
- JD Newell Custom Vintage Fender Amp Cabinetry
- Marsh Tubes and Amplifier Supply
- Tone Tubby Speakers
- Tubes and More
- The Tube Shop
- The Tube Store
- VHT Amplfication