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  1. Been agonizing over posting this here or not. The world is full of EL84 amplifiers - who needs to see another one? I built this for two reasons: To have a tube amp to use while I refurbished my old one, and to have a unit I could surprise people with when they learned what 15 watts per channel can do. Had a lot of fun designing and fabricating the PCBs, punching, drilling, CNC milling and laser-etching the chassis, soldering and testing... this one took about a month of evenings and weekends and represents an investment of $1400 NZ It's the best-looking one I've made so far, and the fastest turnaround. Technical and performance details, schematic, and more photos here. One of these days I'll make something that doesn't look like such a rats' nest inside. The Silicon Centipede is the microcontroller for the remote control... the RC allows remote power switching, input selection and volume control (motor driven). This thing's been pleasing us with its performance and surprising amount of authority it exerts over the fairly inefficient KEF speakers, given its small wattage. It certainly lends credence to the myth of tube watts being different from solid-state watts. It passed the Salmonella Dub test with flying colours. It weighs about 10kg with the big transformers at the back. I don't have any small children in the house so I'm happy enough leaving the tubes exposed but I see most commercial gear offers optional cages or shields over them. The big power tubes get up to around 160ºC Planning to take this to a few peoples' places and try it on various different speakers. I see a few people around building tube gear. wonder if there's enough of us for a get-together/swap-meet some time?
  2. Hi all i am making a new pair of monoblock ampllfiers using nos brimar 6v6g,s in pushpull for the power,in the phase and preamp i am using nos russian 6sn7s with gold grids and british ef37a. the design is based off the leak TL12.1 instead of using a gz34 for rectifer i am using a lower powered rusian version of the gz34 mainly because of the cost. the 6v6 is in the 6l6 6f6 family and because the 6f6 is a kt66 by running the cathode ristors a bit lower and a number of other changes i can use a 6v6. the output transformers are the 20 watt altronics line transformers that i have talked about here and for power transformers i am going to use the beacon R08 its about 300 volts a side it might be a bit more i might use a choke but they will need to be a decent size and i don't have a decent size pair. thanks Bruno
  3. Hey! Ok, any suggestions for a valve amplifier book, one for beginners? I remember waaayyyy back when I was doing electrical engineering (I didn't complete it! They starting trying to teach me "0"s an "1"s, so I lost interest!) I'm nearly finished my turntable project, so looking for the next one:) Cheers!
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