#2611.1/#2612.1 (also known as GUF-1) are superior replacements for original 4-pole units. Exceptional improvement. Installation requires drilling three small holes in the radio chassis -- instructions are provided.

The 2nd IF fitlers are designed to be installed in the accessory crystal filter slots. Installation is as described in the Drake Model R-4C Receiver Instruction Manual.

R-4C

Sort by: Product Price Default #2600.2 125 Hz 5695.0 kHz CW 8-pole... See details   #2601.2 250 Hz 5695.0 kHz CW 8-pole... See details   #2603.2 500 Hz 5695.0 kHz CW 8-pole... See details   #2608.2 1800 Hz 5695.0 kHz SSB 8-pole... See details   #2609.2 2100 Hz 5695.0 kHz SSB 8-pole... See details   #2611.1 6000 Hz 5645.0 kHz GUF-1... See details   #2611.2 6000 Hz 5645.0 kHz AM 8-pole... See details #2612.1 8000 Hz 5645.0 kHz GUF-1... See details