astatic 575m6 and d104mb series mics

[crusader]

hi ,with production of the 575m6 finished and the mobile 104 series still available, can anyone tell me the difference in circuit diagrams? are they basically the same inside with the exception of the tone control? do either use speech compression ? thanks in advance.

 

[bob85]

newer d104m6's use the same circuit and cartridge without the tone control, it uses a fixed load resistor where the 575 has a variable resistor to alter bass response, it is pretty easy to put a tone on the 104 and make it sound much less tinny, i think i posted how to do it somewhere on here.

 

[crusader]

thanks very much bob, i bought a 104 off e-bay recently,and always fancied a 575 teardrop but are hard to come by and are expensive, so if you say they are all but identical, there does'nt seem much point spending an arm and a leg buying one if the 104 will do the trick. thank you very much for the quick reply.

 

[rfoverlord]

i have the 575, 1rst one. i think i prefer the 104m6b with mods.
both are good mics imho. now i want to try and find a shure since they are suppose to be the most natrural sounding.

 

[rachet_jaw]

If memory serves me right, you can remove the fixed limiter, and replace with a 2meg variable, and viola! 575 a la d104.

 

[crusader]

nice one ratchet-jaw,but what is a fixed limiter? is it a resister? what value? 73's

 

[bob85]

heres how to do it, sorry i seem to have lost the pics, i will try and find them, some thick foam around the cartridge can help with case acoustics too,, http://forum.worldwidedx.com/viewtopic.php?t=7997

 

[crusader]

nice one and thanks very much Bob.

 

[Metal Head]

I realy need a picture of that resistor that you can clip for more base. After I had my Connex 330 HP modded the pitch went way high and i need to bring it down.

 

[bob85]

heres a pic mack took, i would change rather than just clip the resistor
http://i5.photobucket.com/albums/y152/ukmudduck/my album/DSC00001.jpg

 

[Metal Head]

Thanks for the picture.

 

[Highlander_821]

The 575 uses a ceramic element, the d104 uses a crystal element.

 

[bob85]

my 575's and d104's use the same small cartridge, not sure what the old d104m6 uses but they have a larger cast alloy cartridge like a 555/539 and a few other astatic hand mics, the mod will work on either type of d104, all the amplified models i have seen use a load resistor to control bass output of the high impedance cartridge.