Tube Amp Archive

You're getting a Half-wave rectified -60V dc from the HT right? You can add a little more resistance to the 220k in series to bring the Voltage down to -50V dc. Also consider that it's going to hit another 15k in series in it's path and the trim pot and the top of a couple of caps. Then the grid lea...

Hey guys, I'm completely new to amp making and I was wondering if anyone had any good books/websites to read. My knowledge of electronics is not amazing but I really wanna learn. Any ideas where to start would be great. Cheers Emre Hi Emre, What are your goals in terms of amp making? Are you intere...

Getting back to the original post, KOC recommends a bootstrap MV for most of the Marshalls. If your amp's PA is the same as the Plexi or 800 then bootstrapping is just tying the ground from the MV pot to the bottom of the resistor hanging off the Cathode of the splitter. Tut 4 has an excellent chapt...

It is my understanding that along with voltage it also depends on the Ra of the OT. For the pp circuits on the duncanamps page, the OT is 1700 Ra. An OT with a different Ra would yield a different result. The Ra will determine the current draw of the tube and hence the Pwr at that particular voltage...