Today I would like to present the old structure in a new version. In 2012 I built a hi-gain based on a Fender preamp and a modified Mesa DR (Hellstone?), Which I called Angels? Massacrator. It was built so that 6N2P and ECC83 lamps can be used at any position. Each base has a glow switch. Two EL84 / 6P14P can work at the end, but also Polish TV PL841 thanks to the glow switch and the G2 grid. The design turned out to be unsuccessful, although some video from YT tests is: https://www.youtube.com/watch?v=4UMl-x9ajFc. What went wrong? Hard to say. The amplifier was getting excited, it could not be turned on full. He could even receive local radio from time to time. I couldn't deal with the problem and recently I took the preamplifier apart. He did it for about six months. My friend from Defil Repairman recently asked me if I had any 10-25W two-channel amplifier in stock. I didn't, but I remembered that I can actually have. Maybe not immediately, but rather quickly, because it is enough to add preamplifiers to this project. It stood on the classic, i.e. a two-mode Fender with a three-position equalizer and a JCM800. I got down to work and the effect can be seen in the pictures below. In addition to the preamps, an inverter was built from scratch and the power supply was slightly rebuilt.
Some videos from testing the version with the new preamp are also on YT.
Very nicely. Beautiful old school mounting on boards with solder pads. The only question is, why didn't you place the output tubes closer to the loudspeaker transformer? Does not wake up after long wires? The core of the "universal" plate blemishes the structure.
The rule is that the power tubes should be far from the preamplifier input tube and I stick to this principle. No problem with long cables. Nothing wakes up. And the universal board, because the switching system could be made quickly and subjected to quick modifications. It was supposed to be a quick project.
And if someone asked about the schematics, I have a preamplifier schematic: