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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: Filament bias and PP DHT posted by fatbottle on January 26, 2007 at 01:02:14:
A couple of things I would change. Since you're using DC heating, it makes no sense in adding hum bucking pots on each side. I would replace the pots with fixed resistors - a pair of 10 ohms on each side would be okay and then take the signal from the center of those.Next for balance control I would add just one pot - the wiper would go to the center resistor that heads to ground. Each other end would go to the common connection of those 10 ohm fixed resistors on each 46. I don't know what value would be best for that one pot, but it shouldn't need to be too big.
Kurt
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Follow Ups
- Re: Filament bias and PP DHT - kurt s 08:15:05 01/26/07 (5)
- Yes, the pots are put in the wrong place. - cheap-Jack 08:26:41 01/26/07 (1)
- Re: Yes, the pots are put in the wrong place. - fatbottle 08:42:45 01/26/07 (0)
- Re: Filament bias and PP DHT - fatbottle 08:23:20 01/26/07 (2)
- I'd opt for the LL1635/5ma or perhaps the /20 - arend-jan 09:12:50 01/26/07 (1)
- Re: I'd opt for the LL1635/5ma or perhaps the /20 - fatbottle 10:59:56 01/26/07 (0)
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