My guitar amplifier
For quite a while, I wanted to own a small, low power all tube guitar amplifier that would sound very Tweedy or tonally american, like the well known sounds from SRV. An amp that I could use at home with a small or BIG cabinet, would be eco friendly because it would be made of recyclable materials and with low power consumption, easy to move around yet sturdy, and that I could play in a neighbor friendly volume, without it sounding dull.
The first step, was to look for something online, through a few web shops and publications. I researched and ended up finding mainly 5 watt, also some lower wattage options that costed a lot more than what I wanted to spend.
I searched in few DIY guitar gear websites and forums and found a few possibilities, some easier than others, some required more money than others, some had no information concerning the the first run with flying colors.
In the end I found a lot of suggestions at a few forums. I was advised that sometimes transformers are 70% of the cost of non replaceable parts. If I would use an alternative to a power supply transformer I would save 35% of the total cost. Went to the Warsaw Polytechnic talked with a power supply specialist and he provided me with the recipe for a SMPS Boost supply that took 12VDC to 220VDC quietly. I calculated all the tube parameters, and the end result is the amplifier you can see in the pictures ! I will try to make a low-fi video eventually.
The back side
Art is… Skulptor specifications:
Power: 1 Watt
Type: Class AB ( Push-Pull)
Controls: Gain, Tone and Volume ( also has Treble switch)
Channels: 1 Channel ( From Clean to Crunch using the Gain knob)
Output: 1 to 8 ohm or 16 ohm speaker
Pre-amp Tubes: 2 x 12AX7 ( But V1 or V2 can be swapped by 12AT7, 12AY7, 12AU7)
Power tube: 12AU7 ( But swapped by 12AT7 or ECC99)
Special Features: Cooling Fan, SMPS High voltage control knob , Effects loop with send level, Hardwired point to point.
Power supply: 12V DC with 2 Amperes (minimum)
Size (Height x Width x Depth ): 16cm x 22cm x 14,5cm