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About my KT88 Tubes

I am fairly new to analog,tube audio equipment so I thought I'd use this thread to gain some insight on a tube situation that I am experiencing.
My Cary 120S amp uses 8, KT88 power tubes and came with 8 matched Electro Harmonix tubes. Recently, I started loosing tubes from both sides. I would replace them and rebias everything and everything sounded good. I started thinking probably these tubes were getting near the end of there useful life so I chose to replace them all with 2 matched quads of "Gold Lions" which I have heard, were superior. Upon installing them, I am noticing that my top end is very shrill almost to a tinny sound. Do these tubes have a break in period? Does anyone else have experience with these tubes?
markus1299

Showing 2 responses by vegasears

vegasears
1,173 posts
 
I am no expert either but I replaced my Winged "C" 6550 tubes with Gold Lion KT88's. At first I was not impressed. With my amps it took a week of heavy use for them to come around but when they did I was hooked. My feeling is yours will smooth out real nice so give it a little time.

good luck
vegasears
1,173 posts
 
I am no expert either but I replaced my Winged "C" 6550 tubes with Gold Lion KT88's. At first I was not impressed. With my amps it took a week of heavy use for them to come around but when they did I was hooked. My feeling is yours will smooth out real nice so give it a little time.

good luck
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