1--- For UHF section
a--- what is " .10mH + 9V " in uhf section ????
A cut and paste vestige - I fixed it.
b--- Because I'm a 2405 (16 ohms) and the DCR is 8 ohms and the 2405H
is 4 ohms DCR Right??
it is necessary to modifie circuit in according impedance change ???
No. All 077's, 2405's and 2405H's are 10 ohm transducers regardless of what is stamped on the foilcal.
2--- For LF section
a--- the 5.4 mH air coil is .63 Ohms....
but I found a air core of .30 Ohms...
It is a better but the difference in ohms it is problem ???
No. Use the 0.30 ohm 5.4 mH coil.
It is necessary to compensate by a resistance in serial ???
No.
b--- Heuu.... Giskard it is possible to other cut and paste error:
In your second listing parts you match 33 mfd and 51 mfd for
according of not 2 X 40 Mfd is not available on solen but this caps
is obligation to match value in opposite (according to DC Charge) ???
The 33 uF and 51 uF in series are closer to 20 uF than the two 39 uF.
Use whichever you want.
3--- For MF section
a--- You write put down mH in coil for 2121 => 1.8 to 1.7 but It is necessary to adap the 2420 too
I'm not going to modify the 3144/3145 circuit for a 2121. It has undesireable breakup modes and I would never use it. Recone a 2121 as a 2122.
4--- For HF section (according to modification) :
a--- 3 resistance in parralle in 62 ohms but one of .42 Ohms in serial with
.68 mH ?? It is value of coil resistance or it really other resistance
for compensation of transfo coil???
5--- The PB is polypropylene caps 400V...
it is better to build with a bypass at low value in paper and foil ???
( I know is realy higher price but I dont care at this state...
)
I don't understand what you are trying to tell me.