Drake R7 Modifications 1. 24V & -5V multivibrator PS PCB ["19" board] was fed from the +10V regulated supply line on some models. Reconnecting the input to this board to the +13.8V supply removes some burden & switching transients from the +10V supply improving voltage regulation. 2. Remove Q1301 from the RF filter-switch ["13"] board & place a jumper in the holes formerly occupied by its emitter & collector leads. This allows operation of preamp [Q1302] on bands 1, 2, & 3. Preamp is still controlled by the preamp enable switch. 3. Replace incandescent RIT indicator lamp w/a red T1 or rectangular LED in series w/a 1K ohm, 1/4-watt resistor to end bulb burnouts here. 4. Remove the no. 53 pilot lamps from the analog tuning dial & S-meter, break the glass bulbs & remove the filaments. Solder a high intensity white T1 3/4 LED in place of each filament w/the cathode connected to the shell of the lamp base & the anode to the center terminal. I left the lamp sockets wired in parallel & connected a 200 ohm, 10-watt resistor in series w/their +13.8 supply line. Although this resistor was much heavier than necessary it had the advantage of being able to mount to the R7 chassis. I tried soldering 1/2 watt series resistors to each of the old no. 53 lamp bases first but found they got too hot & made the new LED/resistor "lamp" assemblies too large so I removed them from the bases & fed them both w/the 200 ohm resistor from my junk box. In reality, anything 180-200 ohms, over 2 watts just to be safe will work here. 5. This last mod. I haven't tried yet. It consists of outputting the R7's 3rd IF to an upconverter which changes it to 455 KHz., then this signal is buffered & fed to a Sherwood Engineering SE-3 MK III D AM PLL [phase locked loop] detector which is claimed to outperform Drake's PLL detector. This is an outboard unit & sells for about $744 w/all three components plus S&H. If Sherwood connects the 3rd IF output line there's an additional $45 charge. If you're interested more info can be found at: www.sherweng.com. Drawings showing these changes are available, for more info e-mail me at email@example.com.