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Registered Member #3781
Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
Ah my friend wants me to build him a tube amplifier for his guitar and I thought it would be a cool project so I agreed. Plus, he's funding the whole thing and giving me a bit of money at the end for my time. However, I have never built a tube amplifier before and I don't know where to start. If someone could point me in the right direction that would be nice. He's not picky either: 2 channel amp with 100 watts rms per channel with only a gain and master volume control. He just wants to see the part list, schematic and rough estimate of the cost before we start building.
Registered Member #3781
Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
Thank you Hazmat!!!
Radiotech: Uh not really? He said he'd give me money at the end. He's a friend and honestly I wouldn't care if he paid me or not because it seems like a fun project and I have the time. We were thinking about just pulling a schem off the internet... I just want to know how everything works together.
Also, he wants a tone dial as well and if possible, a switch to go from clean to overdrive
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
If you are going that route with a working design, then first find out if the output transformers and the power transformers are available. If your power supply is going to vacuum tube, it would be best to build one power amplifier block, with its own power supply.
The other thing about 100 watts RMS, it is customary to rate it with a given distortion over a given frequency response, i.e. 1 %, 50 - 15000 Hz. +/- 3 db.
As for a project, without the mechanical layout, and wiring specifics, the project might go sideways very quickly, for any one of a number of reasons beaten down in designs over the past 70 years.
A more practical suggestion for your friend, is to locate an old amplifier on Ebay or other trading sites in restoration audio, get your friend to buy it and then task you to do a complete restoration. That would mean tearing it down to sockets and major parts, and replacing every capacitor, resistor and potentiometer with new parts. This way you will deal with every aspect of the circuit, and allow you to measure how the original parts have changed with age.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I second the motion to buy a kit.
Buying a vintage amp doesn't make much sense. They're obviously trying to "cut the corners" off of paying botique prices by doing it from scratch.
Forgot to mention, a good speaker can cost anywhere from $99 - $400 each.
The speaker makes a big difference. I haven't had a chance to try out the greenbacks yet, but when I get the $170 to buy one, I'm going to mate it to my Champ.
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100 watt 2 channel tube amplifier
