Resistor Substitution Box, Power Rheostat, 500 ohms, 25 watts, with connection terminals for parallel electrolytic capacitor.
RSUBPowerRk-Ck Resistor Substitution Box
Use: Power amp cathode resistor and capacitor.
OK, I admit it. You can calculate circuit values until the cows come home but sometimes it’s so much easier and faster to just dial it in. I’ve been a ham and involved in engineering for over 35 years, and I gotta tell ya, these are undoubtedly some of the most indispensable tools I have ever had.
The RSUB Power Rk-Ck Sub Box is used for dialing in cathode bias by substituting it for the cathode bias resistor in a cathode biased output circuit. The box includes two terminals to connect an electrolytic capacitor in parallel with the cathode resistance. The rheostat is rated at 500 ohms and 25 watts.