Especially in the field of music Roehrenverstaerker still have their place. In the network there are many guides for good amplifier. Here are some links to it!

Here you will find Schematic Circuit Diagram for DIY and further information on Amplifier for guitars
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Very well-described plan for a 50 Wat amplifier tubes with 2 * EL34	www.jogis-roehrenbude.de/Leserbriefe/Mat_Janssen-Gitarren-Amp/50W-Git-Amp.htm
Several small EL84 based amplifier, described very well	www.ax84.com