Hello everyone,


First of all i'm new to this but really "thirsty" and willing to learn so go ahead....


Just got this Fender Champion 600.
Don't really know where to start !?
The guy that gave it to me tried to convert it to a blackface Champ but stopped during the process.
He bought an Alnicomagnet Mod Kit AA764. (got this too with the amp)
My project is to go back as much as possible to the original Champion 600.

Really basic Diagnosis that i've done :


Parts removed :

R18-R19-R20-R21-R22

C1-C8-C9

Parts changed :

Connection of bottom of C1 and bottom of R21 with a 0,022 uF 600V

Replacement R7 with 22K 1W

Replacement R12 with 22K 2W


Replacement R11 with 10K 1W


Parts removed and replaced with jumpers

R3 - R14 – R17 - R25 - R26




Here are the numbers with the tubes in :


6V6 : DCV
Pin 1 0
Pin 2 0
Pin 3 370 hiss and cracks
Pin 4 336
Pin 5 Hiss and cracks
Pin 6 0
Pin 7 0
Pin 8 19,8

12AX7 : DCV
Pin 1 177,6
Pin 2 0
Pin 3 1,52
Pin 4 0
Pin 5 0
Pin 6 179
Pin 7
Pin 8 1,4
Pin 9 0


I noticed that my 22K 1W in R7 is measuring 1,5K when soldered and 22K not soldered to the PCB ?!



Guys, i'm all ears !!!!
Thanks in advance.


Hello everyone,

First of all i'm new to this but really "thirsty" and willing to learn so go ahead....

Just got this Fender Champion 600.
Don't really know where to start !?
The guy that gave it to me tried to convert it to a blackface Champ but stopped during the process.
He bought an Alnicomagnet Mod Kit AA764. (got this too with the amp)
My project is to go back as much as possible to the original Champion 600.

Really basic Diagnosis that i've done :

Parts removed :

R18-R19-R20-R21-R22

C1-C8-C9

Parts changed :

Connection of bottom of C1 and bottom of R21 with a 0,022 uF 600V

Replacement R7 with 22K 1W

Replacement R12 with 22K 2W

Replacement R11 with 10K 1W

Parts removed and replaced with jumpers

R3 - R14 – R17 - R25 - R26


Here are the numbers with the tubes in :

6V6 : DCV
Pin 1 0
Pin 2 0
Pin 3 370 hiss and cracks
Pin 4 336
Pin 5 Hiss and cracks
Pin 6 0
Pin 7 0
Pin 8 19,8

12AX7 : DCV
Pin 1 177,6
Pin 2 0
Pin 3 1,52
Pin 4 0
Pin 5 0
Pin 6 179
Pin 7
Pin 8 1,4
Pin 9 0

I noticed that my 22K 1W in R7 is measuring 1,5K when soldered and 22K not soldered to the PCB ?!


Guys, i'm all ears !!!!
Thanks in advance.