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DIY HiFi Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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DIY HiFi Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: Schematic of my version of the LadyDay posted by Bas Horneman on December 19, 2005 at 16:20:52:
Hi,Nice one Bas, just a few notes....
1) The 12R resistor pair are heater balancers, so use these or the Humpot/Resistor combo instead, not both. My own use with two sets of resistors on each side of the heater balances the Cathode currents out of each side of the heater.
2) The 0.47uF X 2 Capacitors after the rectifier are really "tuning" capacitors, set so you get the kind of HT you want. I was operating the 300B with 350V/60mA with effectively 6K nominal Load (3K OPT Mismatched). Add a few uF to get the HT up to around 450V.
Also the RC circuit across the choke should be adjusted for lowest ripple.
Ciao T
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Follow Ups
- Re: Schematic of my version of the LadyDay - Thorsten 14:31:15 12/20/05 (8)
- Added 2uF B+/HT is now 440V .nt. - Bas Horneman 02:25:22 01/06/06 (4)
- And? Howzdazound? - Thorsten 03:12:19 01/06/06 (3)
- Dunno...did it at 02:00am...measured voltage - Bas Horneman 05:00:25 01/06/06 (2)
- Okay, now you had time for a listen, like it? - Thorsten 08:28:27 01/07/06 (1)
- Sorry T...since I am busy assembling the Prometheus - Bas Horneman 12:10:53 01/07/06 (0)
- Thanks T. - Bas Horneman 01:47:12 12/21/05 (2)
- Re: Thanks T. - Thorsten 04:27:31 12/21/05 (1)
- Thanks again! nt - Bas Horneman 06:25:16 12/21/05 (0)
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