Mod 101 - Page 30

3. Negative Feedback Mod
This mod is very simple. More negative feedback increases clean headroom and frequency response
bandwidth, while decreasing gain. Lowering the resistor value increases the amount of negative feedback.
4. Bypass Cap Mod
This Mod is very simple. Changing this capacitor should make the highs a little smoother.
5. Power Tube Mod
Change the power tubes to 6L6GC’s or EL34’s and re-bias the amp following section 14.
Generally, the 6L6GC’s will give you more bass in a clean setting, while the EL34's will
enter overdrive distortion sooner.
820
T3
MOD
.
1
µ
F
6
3
0
V
.1µF
630V
T3
20K
.
1
µ
F
6
3
0
V
.1µF
630V
820Ω 1/2W 1
Resistors
Remove the 20K resistor from T3 and replace it with an 820.
220µF 50V 1
Caps
Remove the 25µF cap from T2 and replace it with a 220µF cap.
T2
2
2
0
µ
F
5
0
V
820
2
2
µ
F
5
0
V
68K
820
68K
T2
MOD
30