I later replaced it with a much more compact 1×10″ cab with Celestion Vintage G10 speaker. As for the speaker, one of the few guitar speakers you could find in Serbia back in 2005 was Celestion Greenback G12M, so I got one of these to make a 1×12″ cabinet to go with the Firefly. Hookup wire is 1000V solid core in different colors, a gift from (HUGE thanks).
I experimented with several different brands of 12AX7/ECC83 and 12AU7/ECC81 tubes and tried 12AT7/ECC82 as output tube. For caps I used mostly Orange Drops for nF range, silver mica and ceramics for pF range, filter caps are F+T and Nichicon electrolytics and few caps are nice Solen Fast polyester capacitors. Power transformer was custom made by Trafomatic and output transformer is Hammond 125A. offers many low-wattage amp designs, but I finally decided to go with FireFly, a one or so watt hi-gain amp which offers good cranked tone at bedroom level and is not too complicated to build for a newbie.
I purchased good metal film resistors in local store and power transformer is also built here. There aren’t many good audio-grade components here in Serbia so most parts are ordered from Germany, UK or USA. Regardless of that, it’s a great little amp and below is the original build report I wrote back then. I opened it up recently to fix a joint that went bad over time and realized how much progress I made since then regarding soldering, wiring and component placement.
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