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  1. Jesco

    Vintage Hammond Wire: Gauge and Uses

    Hey all! I have a bunch of wire from an old dead Model M Hammond organ. It’s fantastic to work with, nice push back cloth wire. I have been using it for the preamp circuit but am wondering if it will be okay for B+ or grounding connections. How can I determine the voltage rating of the cloth...
  2. Jesco

    Bogen DB110 to 5E3

    Against my better judgement, I thought I would post a thread on my recent conversion. I like doing these conversions but fear too much competition bidding on the chassis on ebay! I made a standard 5E3 with just a few minor updates--PI and power tube grid stoppers. The layout I had to invent. I...
  3. Jesco

    Bogen E30 Conversion

    Hello again, all! I bought a corroded, old Bogen E30 with the hopes of giving it a glorious second life. The Bogen E30 is a 6L6, cathode biased, paraphase, dual volume PA amp that has long since ceased to shush the churlish children of some long forgotten, godforsaken middle school. The...
  4. Jesco

    Cathodyne Phase Inverter Questions

    Hello All! I recently brought a Harmony 305A amp back from the dead. As I created a voltage chart, a few questions came up concerning cathodyne phase inverters, and specifically the readings I was getting. I read Merlin Blencowe's chapters on cathode followers and cathodyne phase inverters, I...
  5. Jesco

    Princeton Reverb Build w/ Hammond Model M Transformers

    Hello again, fine folks! I acquired the power transformer and output transformer from a stripped Hammond Model M organ. It is a PP 6V6 amp; originally, it came with a field coil speaker, which I will not use. After some research I decided to use the transformers to build a BF Princeton Reverb...
  6. Jesco

    Torevibe Build Thread

    Hello all! Having finally received my kit from Weber, I have embarked on building a Torevibe. After a successful 5f2a, this is only the second build I have done. I still have a lot to learn, and I am hoping for some help from the amazing tinkerers here on the Shock Brothers forum. Question 1...
  7. Jesco

    Grid Leak Bias, NFB, and V1 Plate Voltage Mismatch on Vintage 5w SE

    Hello! I have been making modifications to my early 60's Alamo Challenger and have a few questions. I have added the proper schematic below. I am in the process of adding two modifications: 1) adding switchable negative feedback to make the amp more pedal and humbucker-friendly, and 2) making...




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