Disconnect the ground wire that connects each cathode to ground and run a wire connecting both cathodes. This text is from the book "The two grid return resistors, 220K, that connect each output tube grid to the negative voltage supply is disconnected from the voltage supply and grounded to the chassie. it really sings and the most beutiful solo sound appears. There is no problem using a DPDT switch to do this but there will probably be loud pops as well as differences in volume.Ī cathode biased amp gives a more compressed, fat, singing sound which is great for single note play. Connect an electrolytic capacitor in parallel with the cathode resistor, putting the negative to the ground." The actual value of the resistor will vary depending on what kind of amp and what kind of tube. Now put a resistor from one of the cathodes to ground. I tried cathode bias after reading Gerald Webers book "Tube amp talk for the guitarist and tech". I understand that it may be much work to get it foot switchable but it would be nice to at least have a switch on the back of the amp so I can choose bias type when recording.īut, -if anyone can provide me a scheme for having it footswitchable I would be very greatful. However, chord play is not as good as before. When I cathode bias the amp, it really sings and the most beutiful solo sound appears. ![]() My amp, a Fender Princeton Reverb II is originally a fixed bias amp and after some mods I am really pleased with the sound when playing chords and fill-ins. A cathode biased amp gives a more compressed, fat, singing sound which is great for single note play. My thought is that I would use fixed bias for chord play and cathode bias for solo play.Īny thougts about this? is this a good idea? complicated?Ī fixed bias amp is more dynamic with a clearer definition between simultanously ringing tones which is great for chord play. ![]() It would also be nice to have a volume pot installed to adjust the volume between the two. I think of installing a DPDT switch to be able to switch between cathode and fixed bias.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |