Want to build a preamp to go between guitar and guitar amp.
would like to use 90 volts for B+ , this would be a very simple one
dust need the componen value. I sure would like to know how to
use the tube data sheet so I could design it myself. Maybe skunking
could do video on how to use the data sheet. Keeping my fingers crossed 🤞
Thinking on using a mod like this for the B+ voltage. It’s small.
High Voltage DC-DC Boost Converter 8V-32V to ±45V-390V Adjustable ZVS Capacitor Charging Power Supply Module.
electric guitar ideally needs to work into an impedance of around 1MΩ or thereabouts, that would be input and output.
freq range is 70hz to 1,200.00hz thank you very much.
But without knowing any of this, I'll assume it needs to be able to drive a 100K load, set "RaL" at 100K, "Rk" at 3.9K, a 22-47uf cap for "Ck" and set Rg at a load to match what the pickup wants to see. I'd need to know the lowest frequency you need to amplify/pass through and the resistance of Rg to calculate the coupling caps. I'm not sure you need "Cg" for this application. A 0.22uf for "Ca" would pass down to 40-60hz pretty easily. For Rg1, the real load is going to be the input of the amp so you can either just leave this resistor out of the preamp or use something like a 1-2meg to have some load there in case the pre-amp is turn on not plugged into an amplifier.
The tube datasheet has a chart on how to set it up. Do you know the input impedance of the amp you plan to drive with this? Or in other words know the value of the grid leak resistor of the first tube in the amp? We can work backwards from there. Having never worked with a guitar, what sort of load is the pickup looking to match to? i.e. the value of rg.
https://frank.pocnet.net/sheets/093/6/6C4.pdf