Because I wouldn't build it like this a second time....Although for all my complaining, the amp is very quiet (noise-wise)...Heater WiresIf the filaments are AC (directly from the PT), then the wires should be twisted together to reduce noise. Some insist that one part or another is integral to the process. The final result varied quite a bit from the simulation in PSU designer, however. But that wouldn't be as efficient as the LC setup, and also change the load on the power transformer. Free Shipping Australia Wide. Initially my main concern was to keep the preamp tube far away from the power transformer. There's probably some interaction with the tone settings.The "Presence" Control You can use a file or sandpaper to make your edges neater after you finish sawing, only to remember no one will see them anyway. Each groove should be about ¼” deep and only wide enough that a piece of lath can be firmly wedged in. It's also easier to keep a single-ended amp in "Class A territory." Together, these two resistors largely determine the gain (there are other considerations, also.) I know it’s not for everyone. 12AX7 : 12V (they have a split filament, and also run @ 6V) Sorry I didn't see this earlier. However, the extra gain was unnecessary. Can I replace the 6DG6's with 6V6's? But a separate DC supply for the preamp isn't a bad option. 5 years ago on Introduction. Look I'm building a guitar! Just bring a nice hot one out of a warm building into the freezing winter air up north once. You will want to cut two identical pieces from the ¼ inch plywood to be the top and bottom of your dulcimer body. I did the initial design using an excellent (free) design tool: Duncan Amps PSUD2 Designer Va = Anode voltage (185V) About: Go sit in the Faraday cage and think about what you've done... Want to build your own tube amplifier for guitar? That's really why I love traditional woodworking. #1(rectifier) 5.0v @ 3a ct.It's 180V, but with a tube rectifier like a 5U4 instead of the SS bridge, the output voltage should be very near 200V. Cut a groove for each of the two nuts; one 3/8” up from the bottom of the fingerboard and the other 28 ¼” up from the first groove. More gain: increase Plate Resistor Unlike regulated supplies, the different supply voltages are created with current-limiting resistors. The screws fit very snugly, but were also PVA glued in place.Grill ClothThe grill cloth is undyed burlap; a nice open weave that's very transparent to sound waves.It was simply wrapped over the front and stapled in the back, carefully. Less gain: decrease Plate Resistor That dropped the filament voltage right to 6.3V, and the tubes were happy. Use a block of wood as you hammer so you can pound across multiple frets. Single-ended transformers generally reach core saturation quicker than PP OTs--SE (Class A) amps draw current throughout the operating cycle. Answer --DON'T mess with this stuff unless you have a decent understanding of the dangers. Three inches below the first rectangle, draw a 1” x 8” rectangle (see diagram). on Introduction, thanks for the post. I've been working on alot of ideas of my own the past few weeks. Don't believe it when they say "it's not the voltage, it's the amperage that kills you"--because it's both. After trying various solutions, I decided to light just the power tubes with the main transformer, and use a cheap "wallwart" for the 12AX7 preamp. Share it with us! Pa = Maximum plate dissipation (10 watts -- from the datasheet) - Quite literally everyone else. But note the input section. My biasing voltage is slightly less ("hot" bias) than is noted on the datasheets. The power supply in this projects kicks out 200V, which is plenty, with startup spikes near 240V or more... Here are the next round of changes (see the new schematic):(***there's another change I won't be adding to the schematic yet...we'll see if I like it first..***). No fancy jigs or anything, just the one book. There's a guy in Atlanta that is doing pretty good building high-end boutique amps. 50V rating is more than enough...There's a "can" type multi cap photo, just for reference. NFB will also extend the frequency response of the amp. The 2X2 gets hollowed out so it isn't to bad on size or weight. I'll have to print this out and stick it near my candles for when the power goes out. Let dry according to directions. -- Continue removing the excess by cutting inward to the back of the edge (cut #2.) The tuners can be expensive but can also be scavenged from broken instruments. Probably too small for the amp, especially as a SE OT. A medium-voltage power tranny is actually tougher to find than the higher-voltage variety. 5 years ago ), nearly 80% of the output of a 6V6 can be achieved with a 50L6 (~4 watts for a 50L6 vs. 5 watts for a single-ended 6V6 tube.) I rather prefer the Fender tone. The value of the plate resistor also has a profound effect on the amount of 2nd order harmonic distortion the amp produces. That's awesome! Thanks for the inspiration and motivation for this project. Regardless, ALWAYS check the filter caps before touching the internals. I've collected pieces for a while, mostly to use as boat building stations (forms.) A decent set runs $75 or more.NOTE: When passing wiring in / out of the chassis, always protect the wires. It also prevents difficulties when installing the vinyl covering.
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