Welcome to GerusAudio, Manufacturer of 300B SE Stereo Tube Amplifiers



The vision of GerusAudio is to build affordable, aesthetically appealing high quality 300B Single Ended Stereo tube amplifiers.

Key features:

  • DC heaters for the drivers and the power tubes
  • Lundahl Output Transforms
  • Jensen Copper/Oil Coupling Capacitors
  • Illuminated On/Off Switch
  • Audio grade Toroidal Power Transforms
  • Unique hardwood and steel chassis

About the build Process

At GerusAudio we build the chassis in advance, you select from what is completed or in process.

What does that mean to you?

  • You purchase a product with the appearance and power level that suits your tastes/needs
  • Lead time is reduced
  • Upgrade options available

300B Series:

  • 6SH7 Input/Driver
  • 300B
  • Please note: The 300B tubes are NOT included with the amplifier. It's up to you to provide the 300B's of your choice. For testing the amplifier I use Genalex Gold Lion PX 300B's. Some day I hope to lucky enough to own a pair of Western Electric 300B's!

A3 Series: (Built by request only)

  • 6SH7 Input/Driver
  • 2A3, 6A3 or 6B4G

Design Philosophy


GerusAudio uses high quality parts.

  • Lundahl OPT's 
  • Jensen Copper/Oil  Coupling Capacitors
  • Vintage tubes (when available)


At GerusAudio we believe the amplifier needs to look as good as it sounds. 

Price Point

GerusAudio offers a competitive price point for an American made product. 

Power Tubes

Why use a 6A3 or 6B4G instead of the 2A3? 

  • The 6A3 and 6B4G are the same as a 2A3 from a power output standpoint.
  • They sell for about 1/2 the price of a NOS 2A3
  • They work perfectly with DC heaters
  • Readily available


Why use Pentodes for the Input/Driver?

  • To get the required voltage gain with just one tube / one stage
  • Only one coupling capacitor required
  • High current compared to triodes

Contact Information

Drop us a line!