Install filter FCN PRO 5.645 Mhz 1.800 Hz BW, shape factor < 1.4, insertion loss < 4
dBm.
Replace all the equipment's pin diodes with low-noise ones.
Modify all mixers.
Modify UP CONVERTER module circuit.
Modify EXCITER BOARD module circuit.
Modify audio circuit in 2ND IF/AF UNIT module.
Modify circuit in POWER REGULATOR module so that the + 10 Vdc voltage is stabilized at +
10 Vdc +/- 1 mV.
Replace all one-turn adjustment trimmers with 25-turn trimmers.
Modify pre driver circuit in PA UNIT module.
Install BANDS FROM 0 to 1500 Khz without the AUX-7 module.
Install relay to switch antenna input in bands from 0 to 1500 Khz.
Install high stability 40,000,000 Hz reference oscillator (0.5 ppm per year from -45º to
85º).
Adjust the central shaft of the VFO/PTO gear and change the drive rubber.
Adjust all TX and RX parameters, calibrate reference oscillator.
Cosmetic restoration (Change screws for identical stainless steel ones, polish buttons and
legs, put new rubber bumpers on the legs, paint the white stripes on the controls, change
dial and smeter lamps, change blue filters on the dial and smeter window...).
Parts of the TR-7/A
Anodized bottom cover with the new original legs changedBlack dial button knob made with latheNew black injection molded TR-7/A sidesOriginal fan grillNickel-plated fan grill
Front profile
Detail of the milling cutter bitLowering the upper part of the front with the milling cutterMilling upper false profile of the frontScratched original upper front profileRestored upper front profile without scratches
Back side
Original rear panel, first halfOriginal rear panel, second halfRestored rear panel
TR-7/A finished
Restored TR-7/A upper partRestored TR-7/A front and bottom cover