Get loud, clear audio through the PRO-106 Headphone jack and Speakers !
The Radio Shack Pro-106 (GRE PSR500) headphone jack only allows approximately 30% of the receivers audio through it to protect your hearing when using an earpiece. This however, makes it nearly impossible to use an eternal speaker with the unit, as the audio signal is greatly reduced through the headphone jack and will sound distorted when the volume is turned up.To obtain crisp, clean, loud audio using an extension speaker, follow these simple directions: (now your audio will increase by 70 per cent !)
first go to :mods.dk - Modifications for radioamateur
Don't want to undo the radio and do a quick fix !
This mod is done with a small piece of hobby wire.