Friday, December 21, 2012

Building a tube amp Fender Champ 5f1 model copy

It is a fender 5f1 copy with some mods: 

- Solid state rectifier (FRED diodes)
- AA764 power source resistors values
- Standby switch
- One knob traditional tone control
- NFB pot
- Resistive attenuator
- Fat switch
- Master Volume (V 2.0)
- 100nF for the second coupling cap (before the vol pot)
- 6V6 United Electron and 12AX7 Tung-Sol
- PIO capacitors (V 2.0)

* I have tried Carbon Comp Resistor as a plate resistor, but the amp showed up a little hiss noise. So I have used metal film resitors all around.

** updated photos HERE (V 2.0)





fender champ 5f1



The V 1.0 guts:
The "head":
The "box":
The "combo":



NEW PHOTOS V 2.0 :



NEW PROJECT AA764:




6 comments:

  1. This comment has been removed by a blog administrator.

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  2. I prefer solid state because of the cost. The two 100 R resistors are for noise reduction, the catode is for a reference voltage, it is a configuration useded at some amps, whem you don't have the 3,15 + 3,15 transformer with a center tape. Tks for the questions.

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  3. If you have the center tape, only conect it to the ground.

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  4. and forget the two 100R resistor and the cathode.

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  5. There are four pots in the schematic, but I only see three of them on pictures. Where is the fourth one (NFB I guess).

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    Replies
    1. There are four now: one knob tone control, gain, master volume and a negative feedback. The post was updated at some time, the new pictures are in http://guitar4geek.blogspot.com/2016/06/the-new-8-inch-speaker-cabinet-tolex.html (NEW PHOTOS V 2.0 :). I'm not a organized person. Sorry and tks!

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