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Loud buzz upon turning on the amp
149.5.23.2 |
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Posted on August 24, 2014 at 10:07:27 | ||
Posts: 979
Location: Russia Joined: July 1, 2010 |
I have a no-name Chinese SE amplifier powered with two KT88 tubes. I know everything is relative, but it sounds awesome. I asked the seller whether I can use the GE 6550 tubes instead of the stock Chinese instead of the stock Chinese KT88-98 tubes. She said yes, and I've been listening to it for approx. a month without any problems - until yesterday. I turned the amp on and immediately heard a very loud hum and buzz from the speakers - it sounded like a motor sound. The CDP was not turned on. I turned the amp off and noticed that I forgot to set the volume switch to zero. The same thing occurred once again. I cannot say for sure but as far as I remember, I did not always set the volume knob to zero before turning the amp on, and no such thing occurred when I used the stock KT-88 tubes. When I heard the buzz, I switched the amp off immediately both times, then set the volume to zero and switched it on again. After that, no such thing occurred again. Perhaps, this is explained by a different nature of 6550 tubes as compared to KT-88s and by a current in-rush upon turning on? The amp is auto-biased. Soundwise, I like the GE 6550A tubes better here, though the stock tubes are also great. Any ideas? Should I always set the volume to zero before turning the amp on? |