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Stoo
PostPosted: Thu May 07, 2009 3:43 pm 
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Could a fellow use the unused 5k tap on the R/S clone opt as a U/L connection?.......Or have I inhaled too much solder fumes over the years?
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zaphod
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PostPosted: Thu May 07, 2009 5:59 pm 
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Funny, I just answered someone about that very same issue today, over on 18wat.com! :wink:

www.18watt.com/modules.php?name=Forums& ... ic&t=21437

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Stoo
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PostPosted: Thu May 07, 2009 6:10 pm 
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Great minds think alike :wink:

Seriously though...Have you ever used U/L in an EL84 amp like the 18?
Stew
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coco
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PostPosted: Thu May 07, 2009 8:52 pm 
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The original OT had UL taps. We had them altered slightly to 5K [as close to half] so we could to get the Crunch/Munch Lightning effect!

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zaphod
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PostPosted: Fri May 08, 2009 9:36 am 
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Stoo wrote:
Seriously though...Have you ever used U/L in an EL84 amp like the 18?

Graydon Stuckey did this to a pair of 18W amps, to use for hi-fi. He says the trick worked pretty good. It made the amps run much cleaner.

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Revv23
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PostPosted: Fri May 08, 2009 1:33 pm 
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sorry to always be the noob, but what is a U/L?
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Stoo
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PostPosted: Fri May 08, 2009 2:25 pm 
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U/L is Ultra Linear. When in U/L mode the screens are fed from special "U/L" taps on the opt primary instead of a node in the power supply. It was big in the HiFi industry and some builder still use it on Musical instrument amps.
Have a look at this marshall bass amp
http://www.drtube.com/schematics/marshall/1978u.gif
Stew

:lol: Heh!!! my 18 watt kit just arrived!! :D :D :D
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