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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: I have been using AC on filaments for so long ....... posted by vinnie2 on February 8, 2016 at 12:04:36:
I thought I had gotten rid of the preamp ac filament hum before by going to 1 turn pots with resistors on the ends, but I think that the freezer in my shop was masking it. I shut everything off in there and I could then hear a low level but audible hum. I tried every trick I could think of and every trick everyone suggested, but no luck.
I finally decided to try one channel with dc using a bridge and a 10k uf cap on each side of a small resistor. The preamp is now quiet. I think I will have to concede that for preamps, dc filaments are probably the way to go. I will still keep ac on my amp filaments however, as I have been able to get that hum very very low.
It has been quite an education. Thanks to all for your help!
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- I think it is FINALLY all gone..... - vinnie2 15:11:45 02/08/16 (0)
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