If the decision is to replace the field coil spkr with a classic spkr, the field coil choke can be replaced with a choke used in:
Vox AC15, 100mA DC, 10 Hy, D.C.R. = 270 Ω
http://www.classictone.net/40-18082.html
Vox AC30, 100mA DC, 20 Hy, D.C.R. = 419Ω
http://www.classictone.net/40-18043.html
Marshall JMP & JCM800, 120 mA DC, 5 Hy, D.C.R. = 115Ω
http://www.classictone.net/40-18032.html
Filtration with series resistor instead choke is not practical because requires high power resistors (> 10W)
Vox AC15, 100mA DC, 10 Hy, D.C.R. = 270 Ω
http://www.classictone.net/40-18082.html
Vox AC30, 100mA DC, 20 Hy, D.C.R. = 419Ω
http://www.classictone.net/40-18043.html
Marshall JMP & JCM800, 120 mA DC, 5 Hy, D.C.R. = 115Ω
http://www.classictone.net/40-18032.html
Filtration with series resistor instead choke is not practical because requires high power resistors (> 10W)
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