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Battery powered tube amplifier using russian tubes 1J24B and 1J29B. Two Li-Ion batteries are used to provide enough voltage for the filament series arrangement and to supply the MAX1771 SMPS which boosts the 7.4V to 100V for the plates. The heater wiring only requires 35mA of current. The output stage is in Push-pull, driven by a paraphase PI. The total output is 0.3W , which is quite loud to play in a living room. Nice practice amplifier with lots of gain and distortion. The 4″ speaker works nice in this 180x180x80mm box, from an old ammeter. 

Diamond style grill cloth for this small bluetooth speaker. 

Another subminiature tube amplifier, here using the 5672 tubes in push-pull. Preamp is based on the AC30 top boost and the Liverpool amplifier with it’s cold 3rd gain stage. Preamp and PI tubes are russian 6N17B and 6N16B.

Some pictures of my latest build. An AC4 inspired amplifier, but with some extra triodes for some extra gain. The tremolo is an OPAMP based LFO coupled through a LDR to the gain control. Nice thing is the preamp switching, where I can use just the EF86 or the 12ax7, both in parallel or in series, with the EF86 in front. This last configuration can really play some old school metal tones.

testing the sound of this new build. The lamp in this video looks like a 50hz tremolo, but it’s just AC.

When boredom’ strikes? Creativity can too! #repost from 📷 @bowsbymommi #cricutmaker #craftmomma #diyfreak #shoutout #crafting #amcrafting #htv #ironon . #blogger #styleblogger #travelblogger #instablogger #bloggerlife #bloggerlifestyle #makersgonnamake

Not to bad for my 1st try! #diyfreak #diymom #wreathproject #sweetsummertime #summerwreaths #flowerchild