This device is a 50 watt dummy load with a headphone output jack.The headphone jack is a stereo jack wired for mono operation. The output level to the headphones is continuously adjustable. A variable line out is also provided. The load switch switches between the normal speaker for the amplifier and the internal dummy load, which is nominally 8 ohms. Most amplifiers will tolerate a 2 to 1 impedance mismatch. The headphone output jack and its volume control are always active regardless of the position of the load switch.
This item is hand-built to order, to ensure the best attention to detail is paid to its construction. We build them one at a time, on a table - not hundreds at a time on an assembly line. This allows us to reduce the margin for error and produce an overall higher-quality product.
If you get one of these, do yourself a favour and use the best headphones you can find. At first I was using Sennheiser HD 25's (good headphones, but small, closed back) Then I plugged in my open-backed studio monitor headphones (Beyerdynamic DT 801) and the difference was night and day. Schwing!
I just bought a restock one on Reverb from Weber. Way exceeding my expectations. Using it with a 1968 Princeton and a 5C3 Deluxe. Sounds great with a cheap pair of Sony headphones. Sounds like it does through the speakers when cranked. Sounds equally good with volume at 3 and driven with a Barber Gain Changer, with less wear on power tubes. Best part when I came upstairs, my wife said "sounds like it works great." If your wife has no appreciation for the Blues or you live in an apartment, this is a must.