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June 16, 2021, 03:17:18 AM

Author Topic: Need Help with First Tube Build - WE91 300B Parafeed Derivative  (Read 8926 times)

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Offline EricS

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Re: Need Help with First Tube Build - WE91 300B Parafeed Derivative
« Reply #270 on: May 30, 2021, 04:55:17 AM »
Someone suggested that I insert a resistor and see if that reduces the noise level. It did reduce the noise, just not enough to make me happy.  Any resistor greater than 10k results in the meter not moving at all - it just buzzed. Smaller resistors in the range of 1k to 7k actually allow the meter to move and certainly reduce the noise, but still not to a level that I find acceptable.

Bummer. I think I'll need to look into digital meters and find a way to mount one inside the housing for the mechanical meter since all of the digital ones have a smaller diameter face plate. 

Thanks for the links, Tubejack.
Eric

Haven't electrocuted myself yet...   
There are ALWAYS User Serviceable Parts Inside!

Offline EricS

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Re: Need Help with First Tube Build - WE91 300B Parafeed Derivative
« Reply #271 on: June 09, 2021, 04:16:58 PM »
OK, I feel like I cheated by replacing a period hour meter with a new digital one, but it is much more quiet than the original one that I chose.  I think it's time to call this one done and move onto other projects  :D
Eric

Haven't electrocuted myself yet...   
There are ALWAYS User Serviceable Parts Inside!