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  #1  
Old 10th May 2011, 10:36 AM
audiopete audiopete is offline
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Join Date: May 2006
Location: West Lothian, Scotland
Posts: 112
Default Missing image from FAQ thread

Hi,

If possible can the missing image from the following thread be re-inserted?

http://world-designs.co.uk/forum/showthread.php?t=147

Thanks in advance
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  #2  
Old 10th May 2011, 01:31 PM
Richard Richard is offline
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Join Date: Dec 2005
Location: Notts
Posts: 4,573
Default Re: Missing image from FAQ thread

Hi Pete,

That was a while ago! Some of the wording is corrupted so shout if all is not clear.
Overview is, the resistance of the fb resistor is increased to lessen the amount of signal fed back.
The hf compensating cap is adjusted to suit the lower amount of fb and it was found with a scope that the value changes in proportion to the fb resistor.
As the fb resistor is also the cathode resistor a second resistor is added as shown in the pic to keep the valve's dc conditions the same. It does this by providing a parallel path to the fb resistor to restore the original dc value.
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  #3  
Old 10th May 2011, 08:45 PM
audiopete audiopete is offline
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Join Date: May 2006
Location: West Lothian, Scotland
Posts: 112
Default Re: Missing image from FAQ thread

Hi Richard,

Many thanks for the pic and explanation. I had saved the pic showing the links but could not find it on my disc

Yes definitely back in the day, but all new to me
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