Found this info too. The website seems to be down so I copied from Google cashed harvest.
https://www.radiomods.co.nz/texasranger300_600_900seriesmods.html
Texas Ranger TR 300/600/900 series mods
This mod info was sent to me by Weak One, thank you.
Channel conversion
After removing the bottom cover, look behind the channel selector..
You are looking for J33, once located, find P5(yellow) &P6 (grey).
Cut wire on P5 which is yellow and install a SPST switch inline.
Cut P6 which is grey and install a SPST switch in line.
If you want, you can wire it up to the switches on the radio, anl-nb-ch19/off-dim bright.
Just make sure that if you want it bright, that you wire acordingly, the same with the anl-nb, if you want it on, wire acordingly.
Talk back
Clip D75 and install a switch for on/off talk back.
OR
This version will give you the abillity to change the audio level.
1. Remove D75
2. Add a jumper from JP25 to Cathode of D79
3. If the audio level is not loud enough, replace R-221 with 56K ohm.
Step #3 is not really necessary as the audio level is loud, but to some users it may not be loud enough
Clarifier mods for the TR696, TR966 and TR696F mobile and base ssb radios
First off, remove the top and bottom covers, take the knobs off of the radio, and remove the screws for the face plate.
Very carefully lift the face plate up just far enough so you can do the clarifier mod..
You have to lift the face up and if your carefull, it's easy to lift it up far enough without having to un-hook any wires with no problem..
VERSION#1
1.Remove R113
2.Remove D68
3.Remove D38
4.Place a wire across D38 mounting holes
5.Place a wire from J14 (which is +8volts) and connect it to J9 at the F1 connection.
Version #2
With the instructions about the covers and
face being taken off as in the first and third version.
1. Remove R113
2. Remove D68
3. Place wire from J14(+8volts) and connect it to J9 at position F1
Version #3
After the covers and face are taken off, and the face lifted slightly
1. Remove JP195
2. Remove JP196
3. Place wire from J14(+8volts)and connect it to J9 at the F1 position
HIGH POWER MOD (30-35watts)
This will work for most EPT-069610Z Boards.
Install the parts listed below:
1. Q47 One additional 2sc1969 final with isolation hardware.
2. A heat sink should be bolted to the rear of the chassis after the conversion.
3.D91-1n4148 diode.
4. C209-390pf 5% 50mv mica capacitor.
5. C212-104uf 5% 50mv ceramic capacitor.
6. R242-22 ohm 1/8 watt 5% carbon film resistor
7. R243-150ohm 1/2 watt 5% carbon film resistor
8. L34-22uh conformal coated choke
9. Q47-2SC1969 Transistor
10. VR11-100 variable potentiometer.
Adjustments
AM Modulation limiter R-276
VR-1 AM S-METER
VR-2 SSB S-METER
VR-3 SSB SQUELCH RANGE
VR-4 AM SQUELCH RANGE
VR-6 SSB CARRIER BALANCE
VR-7 TX OFFSET
VR-9 RF METER
VR-10 FINAL BIAS
VR-12 DRIVER BIAS
VR-13 SSB ALC
VR-14 A HIGH POWER
VR-15 AM MODULATION METER
VR-16 AM MODULATION
VR-17 SSB POWER
VR-18 AM LOW POWER
VC1-10.240 MHz Frequency adjustment
