I tried not to mess with the Fender Champ's original parts value's but ended up adding extra filter caps and keep the choke of the (5E1)
to smooth out the power supply. The 5F1 went to 16uf on the first cap but dropped the Choke.
Two caps at 8uf and two at 20uf were used instead of using the original three at 8uf.
By today's standard the filter caps value's in the champ are small, this is because back in the day capacitors were expensive.
On the 5E1 Champ, the screen and plate are tied together on the same node, on the 5F1 Champ they are on separate
nodes with a 10k resistor between them.
This brings the screen voltage below the plate voltage.
A 5.6k resistor was used resulting in 309 volts at the plate and 298 volts at the screen.
The 5E1 has a 22uf bypass cap (bass boost) on the first stage, while the 5F1 has no bypass cap, a three position
switch was installed to swap between 10uf bypass cap no bypass cap (5F1) and a 2.2uf bypass cap.
On the second stage a two position switch was installed to swap between the standard 1.5k cathode resistor and a 2k cathode resistor with a 3.3uf
bypass cap (bass boost). A couple of eyelets were added to the board so these parts could be mounted.
On the layout the red wires from the power transformer are the high voltage.
They connect to pins 4 and 6 on the rectifier tube socket, the gray center tap connects to ground.
The yellow wires are 5 volts and connect to pins 2 and 8,the heaters on the Rectifier tube socket.
From the power transformer, the green 6.3 volt wires(not shown) connect to T5 and T6.
Circuit Board Drilled with
eyelets Tube Sockets x 2 Potentiometer Alpha Audio Wire & RG-174 cable Jack Mono 6.3mm Coupling Caps Mallory 150 0.022uf Cathode Caps .22uf/1uf/2.2uf/22uf/100uf Filter Caps 22uf/450v x 3
Pull Down 1M Vishay Metal
Film Grid stopper 39k Vishay Dale Plate Load 100k Allen Bradley x 2 Cathode 1.5k Carbon Comp x 2 Grid leak 240k Metal Film Metal Oxide 10k 2w, 22k 2w Cathode 470r 3w Metal Oxide Negative feedback 22k Carbon Comp
