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Old 14th May 2005, 08:55 AM   #1
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Default 6528 Se

I had 8 6528A and 18 6528. I buy them just for OTL. but soon I found it not suitable. In Taiwan the weather is so hot . If i put it in my living room. It will be very terriable. So I want to make an AMP SE or SEPP will be fine. which tubes for 6528 seAMP will be better. I have 2 RAYTHEON 5842 some 5687 12av7 12b4a 6s4a 6c4 5844 5965 7898 6gk5 6er5 6j4 6j6 7062 ec86 6H30pi 6c45pi 5670 7b6 12sl7 12AT7 12au7....... or someone can give me an idea how to make a better SE-AMP.
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Old 14th May 2005, 11:22 AM   #2
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There's a 6528 design in Morgan Jones book Valve Amplifiers, ed. 3.
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Old 14th May 2005, 01:04 PM   #3
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I understand that the 6528 has a problem with severe radioactivity emanating from the plate. This can be very hazardous, especially in hot climates. The only safe answer is to carefully box them up and send them to me for proper disposal.
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And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
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Old 14th May 2005, 01:11 PM   #4
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I have been told that the 6528 has overheating problems, and a friend used his with a fan under it. Not sure how severe a problem this could be. I also wonder if tube coolers would help.
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Old 14th May 2005, 01:29 PM   #5
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The fan is a clever idea. The one OTL I built with 6528 required rather noisy forced-air cooling- they run HOT. There's 30 watts of heater power to dissipate before one even considers the plate dissipation.

One other thing is the criticality of warm-up time. The heaters must be run for at least 30-45 seconds before application of B+.

On the bright side, the tubes do make a lovely tinkling sound during warm-up and cool-down.
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And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
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Old 14th May 2005, 05:44 PM   #6
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There's a 6528 design in Morgan Jones book Valve Amplifiers, ed. 3.
can I find it in any webs
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Old 14th May 2005, 05:49 PM   #7
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Probably nothing on the web for Morgan Jones - best to buy his book - it's really worth having. Andy
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Old 14th May 2005, 08:58 PM   #8
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Thanks I just Order with Amazon. I had made one 5842 DC 7236 with VT(RCA 5R4GYB) regular and 1(RCA 6AS7G)pass + 1RCA 6SQ7 1RCA 0A3 1RCA 0D3. The same problem with it(ALL the tubes sets to closed esp 7236 5R4 6As7G 5842). So I use an Fan for coolling. It works but a little bit noisey. And I think the fan will vibrate all the tubes.
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Old 14th May 2005, 08:58 PM   #9
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Thanks for Dr. Yukio Hattori
I love these tubes and I'll try to deal with the problem. It seems much better than 6336(I have some6336 6336A 6336B) and much easy to drive so thanks again
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Old 15th May 2005, 01:25 AM   #10
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I think you reduce the noise of the fan by running it at half voltage, e.g. run a 12v fan at 6v.
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