Search results

I did some load line calculations and believe the amp will not be harmed by running it with 8 ohm speakers, especially if I bias it a little colder by increasing the cathode resistor to be 150 ohms versus the original 130 ohms. Yes, the load impedance for the tubes is not ideal for maximum...

It seems all the tube design data indicates a single cathode resistor for standard PP designs, separate cathode resistors for PP designs using ultra-linear transformers. One source I've researched indicates that a single cathode resistor increases even-ordered distortion, which, based on...

First things first! :) I have cleaned and tested the tubes, but have not yet plugged in the amp. I have to rig up a series lightbulb setup before I plug it in as I'm pretty sure it has not been used in a great number of years. All of the tubes - which appear to be original - tested very...

Nice looking amp! I just acquired an RS-177F to do something similar with. Which Hammond OT's did you install?

Tweeters & Schematic/PL I just acquired all the electronic parts to an RCA 1VF-619a console which also has the RS177F power amp and the same complement of speakers as your console. I plan on restoring and converting the amp into a bookshelf unit with modern speakers. Let me know if you are...