Hey guys, I'm reworking my FT-101e and thought I'd ask the question, what could I do to the Ft to improve the AM audio quality? How would I interface a audio chain for the best results? Thanks
Good Morning,
Well, first things first, Number one, Change All the relays to new, Number two, do the filter board and replace all HV Filters. Number three Check and make sure in your unit all the removable boards sit correctly and the contacts are very clean and tight, as well clean and tighten as necessary all contactors and Crystal sockets and Tube sockets ETC...Clean the rig...., Number four, in the Pa section :
There will come a time when the finals in your FT101E will need
replacing. These transceivers were originally equipped with 6JS6C
tubes manufactured by NEC. This tube's properties are slightly
different from the 6JS6C tubes available today from American tube
manufacturers. By the way, don't bother looking for tubes made by
NEC. They got out of the business several years ago.
In order to use the "American" variety 6JS6's, a simple modification
to the neutralization circuit must be made to the final section of the
transceiver.
The modification consists of replacing the fixed value 100 pf 1000 VDC
mica capacitor with a 10 pf 1000 VDC mica capacitor. This capacitor,
C125, is in series with the 10 pf variable neutralizing capacitor off
of the plate circuit.
If this modification has not already been completed on your rig, be
sure to use a mica or silver mica of at least 1000 VDC. Do not
substitute a different type, because the heat in the final compartment
will change the value, and your tubes will fail prematurely. Also, be
very careful to keep all leads short and in exactly the same
orientation as the original capacitor.
Before reneutralizing, open the variable neutralizing capacitor all the
way to minimum engagement and follow the neutralizing instructions in
the manual. While dipping the plate, remember to adjust the
neutralizing capacitor for equal value meter reading peaks (IC
position) on both sides of the dip when tuning the "Plate" control.
This may be already done in your unit but check just in case.....and check Neutralization for specs.....must be done...
Next, Do the Trons method for the Mod it does work very well, as for your audio chain, use a good isolation transformer and feed your audio chain in at Mic level, use this section from nu9n's web site as your guide,
http://www.nu9n.com/tx.html , it works...
Do not run this rig at maximum Yaam, Tune for maximum and reduce carrier to a sufficient signal and add a little loading for a nice upward movement in signal.
Then have a Blast with it..it's a gud rig for Yaam...
This is what i always did with mine...it worked vely well...
