I don't know where else to ask this question so I apologize if this is the wrong place.

I have a mid 70's SF Fender Pro Reverb that I'd like to try the DR. Z Amp Mod on to see how it sounds but I'm not sure what to do do about the following:

(I don't know where this resistor is because I'm pretty new to tube amps and I don't know what 25/25 means.)
3) replace the 1.5K cathode res. with a 2.7K, and leave the 25/25 bipass
cap in place.


(I don't know what this means.)
4) decouple the stage with a .047 uF.
5) decrease slope res. from 100K to 56K

(What is a dropping resistor and where does it go?)
8) here comes the BIG one install 6V6's to replace the 6L6's, and install
a dropping res. of high wattage to lower the screen voltage, say 500 ohm
10 watt.

You can contact me at mark@bowling123.com. This stuff is very interesting to me but I'm a novice with a lot of time on my hands right now. Thanks
 

I don't know where else to ask this question so I apologize if this is the wrong place.

I have a mid 70's SF Fender Pro Reverb that I'd like to try the DR. Z Amp Mod on to see how it sounds but I'm not sure what to do do about the following:

(I don't know where this resistor is because I'm pretty new to tube amps and I don't know what 25/25 means.)
3) replace the 1.5K cathode res. with a 2.7K, and leave the 25/25 bipass
cap in place.


(I don't know what this means.)
4) decouple the stage with a .047 uF.
5) decrease slope res. from 100K to 56K

(What is a dropping resistor and where does it go?)
8) here comes the BIG one install 6V6's to replace the 6L6's, and install
a dropping res. of high wattage to lower the screen voltage, say 500 ohm
10 watt.

You can contact me at mark@bowling123.com. This stuff is very interesting to me but I'm a novice with a lot of time on my hands right now. Thanks