OngoingMarshall 2203 Amplifier
STDMarshall 2203 Amplifier
License
：Public Domain
Description
Another EasyEDA user asked me to try an build a MARSHALL 2203 Guitar Amplifier, BUT as a low wattage, single-ended guitar amplifier.
What I have done is kept the preamp circuit exactly as the 2203 (two 12AX7 Vacuum tubes, Hi and Low Inputs and Tone Control Circuit) , but made the output amplifier single-ended using a single EL84 Vacuum Tube and Elcor-USA Output Transformer.
Also, the 2203 has a built-in effects effects circuit board, but I have provided Send and Receive Jacks to add external effects!
The "Presence" control circuit can be omitted, as I am not sure it will work with a single-ended circuit.
CORRECTION: R17 and R18 should be 100 ohms (not 100K ohms!!!)
Unverified!
(NOTE: for some unknown reason, the pcb on my laptop will not render in 3D using EasyEDA. I contacted them, but it renders on their computers fine.)
Design Drawing
BOM
| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | L / N / E | AC_IN | TERMINAL_BLOCK_3P_5MM | 1 |
| 2 | KBP306G_C2764881 | BR1 | KBP_4P-L14.5-W3.5-P3.81-L | 1 |
| 3 | 22uf 100v | C1 | CAP-TH_BD8.0-P3.50-D0.6-FD | 1 |
| 4 | 680nF | C2 | CAPACITOR-RADIAL-5MM | 1 |
| 5 | 22nF 400v | C3,C4 | FILM_CAP_15MMPITCH | 2 |
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