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Hi Jim---regarding 'Headroom'...

Posted by Kico (A) on March 20, 2006 at 10:45:59

In Reply to: Re: See my previous post below... posted by Jim McShane on March 19, 2006 at 10:07:23:

'Headroom" at least to me, is what I describe as how loud a clean channel will go before 'breaking up' into distortion. I know this is often associated with the amp's wattage, but I also know it's a bit misleading and rarely too accurate. Yet, a 100 watt amp should have more headroom than a 10 watt. I also know are many other factors that contribute to the perceived headroom, not in the least--

The amount of gain stages in the preamp
How hot the preamp and power tubes are biased
The efficiency of the speakers and output transformers
Whether the rectifier is tube or solid state and probably many more.

I noticed the volume before signal breakup was higher on the KT-88SC's than my Tung-Sols and the KT-90. TS's went first, then the KT-90's, and finally the KT-88SC's. All were biased using the same line voltage (117V) off my auto transformer and were at 85ma.

Again, just my experience...



Regards,
"Kico"

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