We had a number of challenges with this piece even after the famed Russ Friend of Russco Electronics restored it for us: Hum seems to be more annoying and often present with this delicate jewel; We could frankly find no value in the reverse stereo options; And it really does throw out a tremendous amount of heat if left on for longer than an hour or so.

For some, the mere act of waxing nostalgic while listening to music through a tube amp is part of the pay off. If this is you then it may be worth the 200.00 you spend for a used 299A in descent condition.

Keep in mind if you intend to tinker; tube audio equipment can have voltage potentials exceeding 700 volts AC. If you plan to perform your own internal maintenance (other than replacing tubes on unplugged equipment) you should learn and follow all precautions for high voltage electrical work. Most audio equipment will be safe when unplugged but some can actually retain high voltages even after powering down. Tubes can get very hot (especially if the circuit is not operating correctly) and burns are a hazard.

When buying used tube equipment try to make sure all of the receptacles accept a male plug with ease. If you are going to spend the doe for tube equipment either; a) determine to spend the money employing someone who knows TUBE equipment to restore it or; b) buy good quality, barely used, or restored equipment from the git.

The amount of time required for tinkering and refining this piece, to get the best sound and reduce hum, is for us frustrating. If you are a turn it on, twist a knob, use it, and shut it off type person, with little time to tinker; beware. It comes with the territory. Some find the tinkering and troubleshooting part of the joy in owning tube equipment.

If you live in a warm weather region get ready to crank up the AC in the summer. If you live in a cold weather region you could use one of these to heat your mini-warehouse. These suckers really heat up quick!