Tube Amplifier Kit, DIY Tube Preamp Kit, Tube Preamp, DIY Amplifier Kit, 6j1 Vacuum Electron Tube Valve Preamp Tube Amplifie Board Headphone Amp Parts Musical Fidelity Kit DIY Electronic Kits

Outstanding! My love for kit building started in 1963, when I was young and out to prove that a woman could do anything. Not being overly domestic, I quickly developed a love for soldering. I've soldered on stained glass...built an Heathkit stereo FM receiver, a small FM radio, and now this pre-amp. It took a day to build this pre-amp, and the end result is awesome. Coupled with an inexpensive amp I bought from Amazon and a couple of small speakers, the sound is amazing!!! Although there were no instructions, the pcb was well marked so no written instructions were needed. If you're looking for a fun project, I highly recommend buying this kit. You won't be disappointed.

First off the plastic case is sold separately which was a slight bummer. I did end up buying one. I tried running it initially off DC 12v which is what most power adapters are. Was quiet and distorted. Figured out I needed 12v AC and got the correct adapter and it worked. The 2 best cheap mods I have found: Either replacing R14 and R19 with 100ohm resistors or just soldering a 220 ohm resistor on the underside of those supplied two resistors. This slightly opens up the sound stage and raises the volume some. Replacing C10 and C12 with 10uf caps or just bridging the originals with 10uf caps does really help the bass response like another review said. Also getting a matched pair of GE tubes helps improve the sound over the cheap ones supplied. This will cost you about as much as the kit though. With a nice set of headphones this little preamp does sound quite good. That resistor mod to R14/R19 really helped give the volume I wanted on my headphones. They are 40ohm speakers and I doubt you would get near the needed volume on any headphones of much higher resistance.

Haven't soldered it up yet but looks like a great kit with quality components. You really want a soldering station, desoldering tool meter and schematic following. Very nice kit

No instructions, but board is labeled well. Tried reading resistor stripes, and what is included is questionable. Missing parts ( 1 2k2 resistor, and 2 1k resistors, didn't find any 100k ones either. I returned mine, going to try another, if it is missing parts will get my money back. I advise to spend a little bit more for a different item that does the same thing. Darius.

Not the easiest build due to no instructions or schematic but sounds great for the price.

Fun little kit to build, really crappy as an amplifier. Lacks all bass frequencies. Was louder and better quality to just plug the headphones in directly. Also comes with no instructions. Board is well labeled though

Did great job will jam for years thanks guys

I bought and assembled this kit, but have yet to run audio through it. The schematic you show has 5 diodes, but on the main board there was only marked locations for 4. My kit came with 5 diodes. Looking at the board from the front with the potentiometer, on left side,, there is a diode. Looking closely at the PCB, there are two unmarked holes that have PCB traces on either side of that diode. Does the 5th diode go there, and if so, which direction is it oriented?