the Brownie lets you dial in the exact voltage required or desired, meaning a consistent supply of power will be fed into your tube amp no matter where you’re playing. Naturally, such power ...

If you ever wanted to build your own tube amplifier but you were intimidated by working with high voltages, [Marcel]’s low-voltage tube amp design ... and acts as a power amplifier.

After finding the data sheet, she realized something strange: the amp didn ... applying positive voltage to a capacitor. Then the capacitor is quickly disconnected from power, and the input ...