| Author | Message | ||
     Andrew Wilson (awilson40) Username: awilson40 Registered: 05-2006 |
I just did the Paul C mod ( Using Ed Goforth's recommended component values) on my Hd130 It really sounds good. I also replaced the PI tube with a NOS Philips 12AT7. This gives me more useable range before clipping. It think the 12AT7 takes to OD/Distortion pedals better also. It just sounds smoother. To sum up Ed's instructions. The changes are : 1.Remove the 1.5K resistor on the cathode of the 2nd half of the PI tube, replace with a jumper. 2.Move the leg of the 1meg resistor that is at the junction of the 33k cathode and the 1.5 k that was just removed to ground. 3.Add a 4.7meg 1/2 watt resistor from point F (340v) to the grid (pin 2) of PI tube. Works fine, Lasts a long time  | ||
| Andrew Wilson (awilson40) Username: awilson40 Registered: 05-2006 |
here is a quick schematic showing the changes. http://home.earthlink.net/~awilson40/pau l_c_mod.jpg | ||
| Ed Goforth (ed_goforth) Username: ed_goforth Registered: 06-2006 |
Very nice work Andrew, thank you for the drawing. How do you like the mod, I have been doing this mod with great results along with a few preamp and power supply mods, the mods have really given the MM amps a broader spectrum of tones and still keeps its own original voice. The settings are more usable/versatile after the mods. | ||
| Andrew Wilson (awilson40) Username: awilson40 Registered: 05-2006 |
I love it, its finally sounding like I want...just wish I played well enough to show it off. Thanks for all your help with the amp. | ||
| Ed Goforth (ed_goforth) Username: ed_goforth Registered: 06-2006 |
Your welcome Andrew, and thank you for the drawing! Ed |