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PostPosted: 11 Sep 2008, 18:01 
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Joined: 06 Jun 2008, 18:23
Posts: 5195
Location: Australia
I had six members of the Melbourne Audio Club over on the weekend to listen to some open baffle speakers I had made just for the afternoon. Usually I have my big valve monoblocks (push-pull KT88s) on and playing one hour before guests arrive. This time I only managed to get it on 1/2 hour before they arrived.

The comment was made, after an hour of constant listening, that the valve amps had finally warmed up. I have also noticed that after an hour or so I find myself REALLY listening intently to whatever I am playing. I thought it may just be me settling into the afternoon. Now I'm wondering, do big valve amps need one or two hours of constant play before delivering their best. I may have ignored the comment only the person who made it is extremely well respected in the club and an extremely knowledgeable speaker builder.

I have read where the bigger brands, Krell etc. now have a constant on mode.They are suggesting the amps never be turned off but go into some lower mode of power draw. If they are turned off you can expect them not to deliver their best for many, many hours some even say days.

I wondering if our valve owners out there have found the same. How long does it take a valve amp to deliver its best?

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Projects:“MWH” - 1920s UX-171A preamp | ”Image” - Low Profile 100W Class D amp | ”fiih” - 150W Holton inpsired power amp | "Precision" - 300W Class AB Holton power amp


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PostPosted: 11 Sep 2008, 22:38 
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Joined: 06 Jun 2008, 14:03
Posts: 272
Location: Tulsa, Oklahoma
My Bell labs takes about 30 min to get sounding real good and the rca mono block about 15 min.


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PostPosted: 11 Sep 2008, 22:44 
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Joined: 31 Jul 2008, 23:21
Posts: 62
Big power tubes like the KT88 about 15 minutes. Small tubes about 5 minutes. One hour and more seems excessive. Are you purposely running the heaters at a lower voltage?


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PostPosted: 12 Sep 2008, 05:16 
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Joined: 26 Aug 2008, 20:57
Posts: 415
Location: Atlanta
My buddy has Odyssey SS monoblocks, they recommend that they be kept on all the time...the claim is the 120,000uf of capacitance takes so long to charge so the amps sound horrible until then.

Tubes...eh 15-20 minutes...30 tops...once I see that glow I don't want to sit around!!!


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PostPosted: 12 Sep 2008, 06:13 
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Joined: 04 Jun 2008, 21:02
Posts: 85
Location: Philippines
It takes my tube amps a couple of tracks on the CD, so around 6 to 10minutes.


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