Project BETA was initiated from an AX84 BBS thread calling for a simple two-tube push-pull design. The following documents outline my approach to the problem.
Various plate loads for low-mu section of 12DW7.
|101 kB||11/29/09, 8:15:01 PM|
|AX84_4-4-0_Studio_081115_PSU.svg||1007 kB||11/28/09, 1:04:36 PM|
I stole the PSU from this AX84 design for the third design exercise.
|399 kB||11/28/09, 11:42:06 AM|
Some notes from Jim Doyle about how to determine the impedance of the 70V line transformer winding.
|1.1 kB||12/1/09, 9:27:26 PM|
First design exercise: step-up transformer coupling through cathode of second stage.
|13.8 kB||11/14/09, 10:07:54 AM|
Second design exercise: autotransformer coupling.
|14.3 kB||11/17/09, 6:24:59 AM|
Third design exercise: 6SN7 output, autotransformer coupling, negative feedback tone control in second stage cathode. This is probably the one I would prototype.
|55.4 kB||2/4/17, 12:42:22 PM|
Fourth design exercise: autotransformer coupling. Hm..., I really want to do something with that second winding on transformer.
|17.9 kB||8/3/12, 6:41:57 AM|
Hammond 125C — Universal Push-Pull "Classic" Tube Output Transformer
|348 kB||2/4/17, 12:42:10 PM|
70-Volt/100 Watt Line Transformer (320-1034) Features
|1.6 kB||12/1/09, 9:46:26 PM|
70-Volt/100 Watt Line Transformer (320-1034) Connections
|1.9 kB||12/1/09, 9:46:46 PM|
70-Volt/100 Watt Line Transformer (320-1031) Instructions for Speaker Wiring
|290 kB||12/1/09, 9:41:25 PM|
70-Volt/100 Watt Line Transformer (320-1031) Specifications
|2.6 kB||12/1/09, 9:44:12 PM|