musix2000
Member
Hi ....
In the last years I`ve got a lot of information out of this forum and now I think it`s time to show you my experimental prototype. I`ve finished the build in the last month. The body and some parts of the psu came from a t.bone SCT-2000.
To find out what differences in sound various kinds of resistors and capacitors bring: I used switches for 3 different plate resistors and dip-switches for 5 cathode resistors and 5 bypass capacitors. Also there is a switch for two 100pf capacitors, one on or both off. One is an old ceramic tube capacitor, same kind as in the original M250e, the other a KP.
Outside is a switch for omni and cardioid. All switches are slider-switches with very low resistance.
The components inside are the best I`d found (my opinion): CT12 capsule by Tim Campbell, CM13114 transformer by cinemag, microphone graded GE 6072a tube from the 70ies and the best available resistors and capacitors, some NOS (Siemens karbowid), some modern (Vishay foil RS92NA, Welwyn RC55Y, and others). All grounded to one point.
Because nobody produces a suitable 8M resistor I`d asked vishay and they made some probes of the 7M96 cmf55-143 non magnetic for me (all=8M, less than 0,5%).
The components don`t touch the pcb or each other. The transformer lies on felt and is held by a thick wire with small silicon-dampers on it. The tube hangs on two rubber-dampers. Only the big 1uf partly touches the pcb.
The capsule is mounted on a rubber-damper which is mounted on a thick piece of plastic that is hold by four silicon-dampers (these once held the original SCT-2000 capsule).
Maybe someone likes my prototype.
Here you can find some pics:
https://drive.google.com/drive/folders/1jJ0XkZHOZco51QeiIv9Ixl3MyO3B_nmv?usp=sharing
With a click on one of the tumpnails you can open the photos (= better quality).
PS: My english is not the best, please ignore faults I possibly made in the script!
In the last years I`ve got a lot of information out of this forum and now I think it`s time to show you my experimental prototype. I`ve finished the build in the last month. The body and some parts of the psu came from a t.bone SCT-2000.
To find out what differences in sound various kinds of resistors and capacitors bring: I used switches for 3 different plate resistors and dip-switches for 5 cathode resistors and 5 bypass capacitors. Also there is a switch for two 100pf capacitors, one on or both off. One is an old ceramic tube capacitor, same kind as in the original M250e, the other a KP.
Outside is a switch for omni and cardioid. All switches are slider-switches with very low resistance.
The components inside are the best I`d found (my opinion): CT12 capsule by Tim Campbell, CM13114 transformer by cinemag, microphone graded GE 6072a tube from the 70ies and the best available resistors and capacitors, some NOS (Siemens karbowid), some modern (Vishay foil RS92NA, Welwyn RC55Y, and others). All grounded to one point.
Because nobody produces a suitable 8M resistor I`d asked vishay and they made some probes of the 7M96 cmf55-143 non magnetic for me (all=8M, less than 0,5%).
The components don`t touch the pcb or each other. The transformer lies on felt and is held by a thick wire with small silicon-dampers on it. The tube hangs on two rubber-dampers. Only the big 1uf partly touches the pcb.
The capsule is mounted on a rubber-damper which is mounted on a thick piece of plastic that is hold by four silicon-dampers (these once held the original SCT-2000 capsule).
Maybe someone likes my prototype.
Here you can find some pics:
https://drive.google.com/drive/folders/1jJ0XkZHOZco51QeiIv9Ixl3MyO3B_nmv?usp=sharing
With a click on one of the tumpnails you can open the photos (= better quality).
PS: My english is not the best, please ignore faults I possibly made in the script!