|Building tube amps|
One of my hobbies i recently began is buiding tube amplifier. Here are some amps i built.
This is a small practice amp for my home in Sweden. My design polycy of building amplifier is little weird, I first choose the personnel of tube names regardless of circuit. I insist the set of tube names that should sound nice to me. And I like this 6AQ5-6AQ5. You know, 6AQ5 is a miniature power tube which is equivalent to 6V6GT. I use this power tube at pre-amp section, so it's unusual. Although the noise level is relatively high because of the pentode used as pre-tube, the amp sounds really nice.
Now, I work and live in a small town of Sweden (Visby). This is an amp i built in japan and put it in a suitcase. It has no power and heater transformer in order to reduce its weight. I use two 50BM8 with one-knob tone and a master volume to produce both clean and crunch all the way to heavy distortion so called "Woman tone". Because it uses tarnsformer-less circuit, actually it's dangerous because one of the two AC power line is directly connected to the chassis! It could shock you. But in here, I use another transformer to convert 230V to 100V, so it's no problem.
This is a very luxury amp that i made for my friend "Mr. K". He's a rich guy and ordered me this regardless of expense. So i used famous 300B as power tube and interstage trasformers with great apperrance. It also has CR-type equalizing pre-amp for vynil record play.
This is the amp that i presented to the blues bar "Terraplane" in Shibuya. I know the owner very much and have been a long time customer. I gathered available componetns in my junk box to make this, however this amp sounds awesome.
This is my first custom-made amp. My friend asked me to build the one. Although he already has a high power solid-state amp (240W !) that he uses as main audio equipment, he said he wanted to have a more rough & wild tube amp. I designed and assembled this for him. I use 4 cheap 50bm8s in a push-pull circuit and obtain 8W+8W output power.
This is a high grade tube amp that i myself designed. I use famous direct heating triode 2A3 as a single ended power tube and 12AU7 as a driver. It uses big transformers and a choke, so it's big and very heavy (12kg) and also cost a lot (still cheaper than buying one though..)