I just purchased Sony ICF-SW7600GR at the end of 2005. Unfortunately, the receiver didn't come with its original AC adaptor called "Sony AC-E60HG" (sold separately and now discontinued).
So far, I've been powering the unit with NiMH rechargeable batteries, but I'm still not satisfied with the unit's performance due to the following results:
1. When the batteries get weak, my reception suffers/sounds noisy.
2. The tiny volume (sound isn't room filling).
Anyway, the original adaptor AC-E60HG was also dissapointed. I found many reviews that it introduced noise/hum against the SW band (maybe this was the reason behind it's discontinued?).
So, we would like to know, how are you solving this general problem for any 7600GR users.
I use NiMH batteries in my own SW7600GR. It's interesting to hear of the noisy reception issue with weak batteries, which I didn't recognize. The voltage of rechargeable batteries is 1.2 volts, which is 20% less than a 1.5 volt alkaline battery. Batteries will provide less voltage after use. Even a weak alkaline battery can provide more voltage than a fully-charged NiMH battery.
If you have been in the habit of running your rechargeable batteries in the radio until the radio won't power on anymore,
consider periodically measuring the voltage of your rechargeable batteries. If the measured voltage falls below a certain level (such as 1 volt), then consider moving the rechargeable batteries into a less sensitive device like a flashlight until the batteries fade away. Keep a second set of rechargeable batteries around so that you can put fresh ones in your radio when the current batteries are too weak.
On the AC power side, Sony's original adapter for the SW7600GR was reported to introduce interference. Universal Radio, a mail-order radio company in the USA, offers a power supply for the Sony ICF SW7600GR: MW 41-680 power supply. This adapter provides 6 volts DC, 300 milliamps, is filtered, and is not known to cause interference. I wrote to Universal to get a shipping estimate for Indonesia, but unfortunately they do not ship to Indonesia at this time. If you want their power adapter, you may need to be creative in order to obtain it. It is designed for 110 volt AC outlets, so I assume you would need a transformer in order to use it in Indonesia.
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