DIY'ers today have it good! There's lots of projects available on the net to build. Here's a Tube Amp Kit by OddWatt Audi.
The manufacturers specifications for the kit are as follows:
- Rated Power Output: 25 watts (RMS)
- Input Sensitivity: 1.5V (at rated power)
- Input Impedance 100 k-ohm
- Input Terminal: Line Level RCA
- Speaker Output Taps: 4 and 8 ohms
- Distortion: less than 0.5% through half power, 1% at full power
- Frequency Response: 8Hz to 20 kHz +0/-1db at any rated power
- Signal to Noise Ratio: less than 80dB
- Tubes: Gold Lion KT88, NOS JAN Philips 5751
- Supply Voltage: 120VAC 50/60Hz
- Power Consumption: 130 watts (each monoblock)
- Weight: 6.3 kg (each monoblock amp)
- Dimensions: 205 mm (W) X 225 mm (H) X 300 mm (D
http://diyaudioprojects.com/Tubes/5751-KT88-Tube-Amp-Kit/