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Title: screen resistor Post by: joex on August 15, 2010, 06:57:02 PM Hi, I do not see a screen resistor on the output tubes. Do I need them on this build?
Title: Re: screen resistor Post by: mcinku on August 17, 2010, 07:06:11 AM Yes you do.... which picture are you looking at?
Title: Re: screen resistor Post by: joex on August 17, 2010, 11:31:37 PM Hi, thanks for the reply and I was referring to the schematic. There is usually a 470ohm or a
1k soldered to pin 4 although some tweeds did not have a screen resistor. I used a 1k 5w on each just to be safe. Which value would you suggest? I am using Sylvania chrome tops. Thanks again. Title: Re: screen resistor Post by: mcinku on August 18, 2010, 05:39:09 AM I was talking about pin5 which is considered as screen pin... I consider pin 4 as grid only pin...
There's no resistor on pin 4 for this amp. ;) Title: Re: screen resistor Post by: cmoore on August 18, 2010, 02:29:59 PM Are you guys sure you are on the same page...?
To my knowledge, the original BF Princeton did not have screen or grid resistors. It looks like Nik has 1k5 resistors on the grids of his build. He "designed" this layout so I would assume they were a good idea. Pin 4 is the Screen grid. Pin 5 is the Control grid. Good Luck Title: Re: screen resistor Post by: mcinku on August 18, 2010, 06:19:39 PM Source wiki...
Pin 4 - Grid 2 (Screen) Pin 5 - Grid 1 Here it is... http://en.wikipedia.org/wiki/6L6 (http://en.wikipedia.org/wiki/6L6) so I was wrong sorry... |