BIAS TESTING ON MY BREADBOARD
I had to check in on this thread....recently turned my 5E3 Deluxe into a AA964 Princeton in order to utilize a spare gain stage as a tremelo add-on. Had to go from Cathode to Fixed bias of course, and found the inter-dependence of the tremelo and the bias voltage. Removed the tremelo add-on, and am generating bias with a 48V switcher and a monster select-o-drop (see pics). Swapping my SigGen for my guitar regularly to listen to the different biases. Fun! Varying bias from -40 to -23VDC gives me 9 to 43mA plate current. Don't know if I want to stick with the fixed bias or not. Have found higher bias voltage (on the 6V6s) raise the preamp voltages (and the gain and clipping) substantially. Lots of playing and data to take, but am learning a lot!
I had to check in on this thread....recently turned my 5E3 Deluxe into a AA964 Princeton in order to utilize a spare gain stage as a tremelo add-on. Had to go from Cathode to Fixed bias of course, and found the inter-dependence of the tremelo and the bias voltage. Removed the tremelo add-on, and am generating bias with a 48V switcher and a monster select-o-drop (see pics). Swapping my SigGen for my guitar regularly to listen to the different biases. Fun! Varying bias from -40 to -23VDC gives me 9 to 43mA plate current. Don't know if I want to stick with the fixed bias or not. Have found higher bias voltage (on the 6V6s) raise the preamp voltages (and the gain and clipping) substantially. Lots of playing and data to take, but am learning a lot!
Attachments
DF96 and others:
For your possible interest
http://frank.pocnet.net/other/AWV_Radiotronics/Radiotronics_1952/1952_11_AWV_Radiotronics_17_11.pdf
Talks about determining max Rg1 and defines "reverse" grid current.
Cheers,
Ian
For your possible interest
http://frank.pocnet.net/other/AWV_Radiotronics/Radiotronics_1952/1952_11_AWV_Radiotronics_17_11.pdf
Talks about determining max Rg1 and defines "reverse" grid current.
Cheers,
Ian
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.