Worldwide DX Amateur Radio Forums - Ham - CB - HF - VHF - UHF

i would like to try this too.....i actually have a m6b thats a little bassy on my rig.how can i add treble?can someone donate me a pot to do this mod with ?or does radio shack have them?

fnky the only d104's i ever heared that were too bassy are the old original large cartridge versions with the 2 stage amplifiers like the 555 truckers,
you could reduce bass by reducing the value of the load resistor across the input to the amplifier to reduce the cartridges ability to make bass,
just a reverse of what i do with the newer ones that sound tinny,
you are restricted in how much trebble you can actually add while leaving the bass response where it is because the mics dont have enough capacitance to ground that you could alter to make a significant boost in trebble,
i never managed to get the old style sounding as sweet as the tone modded new ones but big improvements can be made on just about any microphone or radio.

__________________
The importance of an antenna having good radiation characteristics cannot be overemphasized.

im screwing with one now.. would rather have a fixed resistor than a adjustable pot..

anyone try it the hard way yet?

whats the hard way?
i tried fixed resistor clipped resistor and tiny surface mount pot, the pot was the most tricky to solder by far but it works perfect, fixed resistor works just as well its just more messing about finding the one that suites your voice and the radio you use, clipping the resistor gives too much bass for my ears,
astatic never changed the case front when they changed to the smaller cartridge, putting foam or a baffle around the cartridge to seal it against the case front helps remove coloration from reflections within the case,
a bit of work and you can almost make a silk purse out of a sows ear.

__________________
The importance of an antenna having good radiation characteristics cannot be overemphasized.

has anyone "stabbed" the points on the back of the board to see
what value they come up with after they get the mic set right?

oh.. hard way = fixed resistor..

The way to do that would be to remove the variable pot once it's been set and check it then but the chances of having the same resisitor or even close to that value would be nearly 0 and then no-ones voices pitches ar the same so a fixed resistor is out of the question which is the reason for the variable in the 1st place.

__________________

no i hear what you are saying..
but the mics we are using now, the RK56 and 636L have no frequency response!

we use cobra/uniden cb's
they all sound great, but they are missing that big export sound!

im still going to play around with a fixed resistor for mine..
i really dont like drilling holes in my new mic..

the pot modification is a great idea.. just not for me..

just trying to get some kind of an idea instead of blindly swapping out
resistors and recording the results from the home 20..

right now i clipped off the top of the load resistor leaving enough to solder to..
took the other leg, bent it out of the way a bit and used forcepts to put a slight kick on the end..

then i solder a resistor across the 2..
when i get what i want i might leave it like that or yank the mic out and
just put the value i want in..

when taking out the mic, is getting at the front a PITA?
if so, i will do it the way i got it now..


thanks for the help,
johnny

No holes required, you simply set it to your liking while you have it open the button it up when you're done.

__________________

i want a fixed resistor, so far im up to 770k..

so far i cut the stock resistor at the top and left some to solder on to.
spread it out and put a 470k across it.

the mic sounds real good, it does have a tad more lower frequencies to it..
not very noticible to my ear..

my buddy replaced his completely with a 1meg resistor..
he likes it..

im wondering at what point it will start to sound bad..

anyone who used the 575 mic run it with the slider set max bass?
(im guessing 2meg?)