To avoid being a straight-up clone, it has a distinct “input selection switch.” It works like a power attenuator but with a twist. The switch lets you choose between 5-watt and 1-watt power ratings. The 5-watt tube amp setting is easier to overdrive and has restricted lows to reduc...
It turned out good, though I spent too much time shielding everything before finding out that the magnetic field from the power transformer couples into the cartridge and results in hum.Anyway, with that done, it was time for a power amp. Because I wanted this amp for my computer room, ...
Due to the high impedances present at the input, I had to pay special attention to a number of details in the prototype to minimize hum and buzz. Here is a short list of sources, both magnetic and electric, that could introduce 60Hz and harmonics into the circuit. ...
The Peavey 6505 head is a 120Watt tube amp with two switchable channels. The 6505 by Peavey has four 6L6GC tubes in the power amp, and five 12AX7 preamp tubes. From left to right, the 6505 has two inputs, High-Gain for the guitars with active pick-ups, and Normal Gain for the ...
We have to say that the amp [Terry] put these transformers to work in sounds pretty amazing — not a hint of hum. Good work, we say, but we hope he has a plan in casethe vacuum tube shortagegets any worse. Continue reading“Flipped Transformer Powers Budget-Friendly Vacuum Tube Amp”...
including the “real†switch. The switches make only when both devices are plugged into the amp. The idea is if you do not have devices plugged into both input and output and have the switch on then the unit is “off†with no battery drain. The battery ...
Again, try the amp without this capacitor. Do you hear any extra hum? If the power lines are long, you might need this capacitor. Above: My solid-state breadboard looks odd beside a tube power supply! Above: Closeup of the LND150 circuit....
The same bus arrangement as above but with the safety and amp ground going to the pipe. The other option I looked at was for a wood chassis with metal plates for the front and back, on which to mount the inputs/outputs and controls. Same bus arrangement but with the front and back ...
Step 1: Symptoms: How Do I Know My Amp Needs a Rebuild? --Hum: Usually a sign of bad filter caps. Poor routing is often a cause. Adding a three-prong cord will help. --Weak signal: Bad tubes, failing output transformer. --No highs/loss of tone: Bad tubes, coupling or bypass ca...
When T12 lamps are replaced with T8 lamps, therefore, the ballast must also be replaced. The advantage of electronic ballasts is that they do not flicker or hum and they use less energy than conventional ballasts. The new T5 are 16 mm in diameter will reduce energy consumption by about 50...