Up for sale here is this vintage Bogen Challenger CHA 20 tube amplifier, circa 1960 and Made in USA. This is a mono (one-channel) amplifier. This uses two 12AX7 tubes (vintage GE), two 6V6GT output tubes (vintage GE), and a 6AX5GT rectifier tube (Bogen, I think RCA). The 12AX7s and the 6V6 tubes are tested good, and the 6AX5 works, so presumably it’s fine. This is complete with bottom cover, top cage/cover, all knobs, all tubes, and a tube cover (it only uses one). It is in very good condition, with light to moderate overall wear, but does have some rust on/around the power transformer and fuseholder especially. I brought this up on a Variac, and it does play well and sounds good. The “phono” input on the back is a line-level input suitable for a CD player or whatever, and the “MIC” input on the front is presumably a hotter input for a guitar or microphone. This has 4-ohm, 8-ohm, 16-ohm, and 70-v taps on the back, and has regular screw terminals as well as 5-pin sockets for speakers. This does play fine, but I noticed the front can capacitor (next to the rectifier) getting pretty warm. This is working right now, but you’ll need to at least replace the electrolytic caps before regular use. This would be a great winter project, and will be an amazing amp once you’re done with it. Please see my pictures for details. If you have any questions, please ask. I have a number of other tube amplifiers, collectibles, and vintage electronics listed–feel free to take a look! The item “Vintage Bogen Challenger CHA 20 Tube Amplifier Guitar 6V6 amp Complete Working” is in sale since Friday, January 12, 2018. This item is in the category “Musical Instruments & Gear\Vintage Musical Instruments\Vintage Guitars & Basses\Guitar Amplifiers”. The seller is “infinidim” and is located in Milwaukee, Wisconsin. This item can be shipped worldwide.
- Model: CHA 20
- Brand: Bogen
- Exact Year: 1960
