Hi Guys,
because of lack of money,
i have to continue using my tascam M3500 rather than changing it,
i have allready recapped the whole board and PSU,
changed grounding to star grounding,
changed opamps to 2604 in the preamp section, OPA2132 in the buss sections
and NJM5532 elsewhere,
I now would like to change the frequency of the low freq eq and high freq eq,
wich are 100Hz and 10KHz ,to 80Hz and 12KHz
i also would like to upgrade transistor in the preamp and EQ sections,
the mic pre transistor are NPN 2SC1844
http://pdf1.alldatasheet.com/datasheet-pdf/view/108512/NEC/2SC1844.html
the EQ transistor are 2SC3112
http://www.toshiba.com/taec/components2/Datasheet_Sync//50/6481.pdf
here are the scans of the tascam input :
http://img4.imageshack.us/i/tascaminputa.jpg/
http://img299.imageshack.us/i/tascaminputb.jpg/
any help for these mods would be greatly appreciated,
especially changing the frequencies and transistor EQ.
Thanks for reading my post,
best regards,
Francois
because of lack of money,
i have to continue using my tascam M3500 rather than changing it,
i have allready recapped the whole board and PSU,
changed grounding to star grounding,
changed opamps to 2604 in the preamp section, OPA2132 in the buss sections
and NJM5532 elsewhere,
I now would like to change the frequency of the low freq eq and high freq eq,
wich are 100Hz and 10KHz ,to 80Hz and 12KHz
i also would like to upgrade transistor in the preamp and EQ sections,
the mic pre transistor are NPN 2SC1844
http://pdf1.alldatasheet.com/datasheet-pdf/view/108512/NEC/2SC1844.html
the EQ transistor are 2SC3112
http://www.toshiba.com/taec/components2/Datasheet_Sync//50/6481.pdf
here are the scans of the tascam input :
http://img4.imageshack.us/i/tascaminputa.jpg/
http://img299.imageshack.us/i/tascaminputb.jpg/
any help for these mods would be greatly appreciated,
especially changing the frequencies and transistor EQ.
Thanks for reading my post,
best regards,
Francois