#Vox pathfinder 15r speaker mods#

Nothing replaces these parts once removed. The limiter modification requires that both LED1 and LED2 be removed from the PC board. The opposite ends of LED1 and LED2 are grounded. LED1 places the anode in the preamp signal path while LED 2 places the cathode in the preamp signal path. These LEDS are labeled 'LED1' and 'LED2' and are located side by side on the main PC board. The Pathfinder Reverb circuit used a pair of PC mounted LED lamps as a level limiter. All work should be completed by a qualified technician. Proceed at your own risk and please remember that amplifier circuits can store lethal voltages. The Vox Showroom has not tested and does not endorse these modifications and we accept no responsibility or liability for damage to person or property resulting from these changes.

#Vox pathfinder 15r speaker mods#

The Vox Showroom has selected several Pathfinder mods from various web sources for presentation below.

The Vox Pathfinder Reverb has drawn considerable attention for aftermarket modification. Modding the V1968R, P15SMR and SMR408 Pathfinder Reverb To protect against excessively low speaker impedances, inserting a cable into the extension speaker jack disconnects the internal 8 ohm speaker. The TDA2030 is not designed to accept speaker loads less than 8 ohms. All that was required for operation was a 40 VDC supply, an audio input signal, an inverse feedback loop connection and a ground. The chip's internal circuitry included over 40 electronic components. It functioned as a complete solid state 15 watt Class AB power amp. Rather than designing a power amp stage using discrete electronic components, Vox chose to utilize a TDA2030 integrated circuit power amplifier chip for the Pathfinder 15 amp. A single 8,' 8 ohm speaker of Oriental origin sported a Vox 'Bulldog' sticker (Figure 2). The Vox Pathfinder Reverb cabinet was constructed from MDF (medium density fiberboard). A label on the pan stated that the input transducer resistance was 600 ohms, the output transducer was 2200 ohms. The Vox Pathfinder Reverb utilized a chassis mounted single spring delay line (Figure 1). The 200-240 volts versions used a 250V/250ma fuse. The 100 and 120 volt versions of the amplifier used a 250V-T500ma fuse. For the UK, Europe and Asia, a 240-240 volt transformer was installed, p/n 057-VFE. For the US market, a 120 volt transformer was installed with the p/n 057-VFU.

For Japan and other countries with 100 VAC mains, Vox installed a power transformer with a 100VAC primary, p/n 057-VFJ.

Vox addressed this issue by offering the Pathfinder Reverb with one of three different mains transformers. The Vox Pathfinder Reverb did not include a mains selector to adjust for the various AC line voltages offered in the world.