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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: Round 2 of YAWE91B300BA (warning bigpics) posted by Thorsten on January 20, 2005 at 05:17:31:
Thorsten,Thanks so much for the detailed construction notes and pictures. I need explanation on a couple of your comments. This question will show my ignorance on TUBE DIY. Anyway, your notes say:
"Also please note that the Heater of the 310A input valve is elevated to around 30V, instead of being simply centered and returned to ground."
and you go on to say:
"Lastly, in my Amplifier (this one and others) I routinely operate Valves at the lower tolerance limit for the Heater Voltage, in my case the 300B and 274A both have actually 4.8V across them and not 5V and the 310A operates at 9.1V Heater voltage."
I've read previously about raising the heater above ground for noise reduction, but I don't understand the implementation. You mention only running the Heater at 9.1 volts, but you also say that the heater is elevated to 30 volts. How are both of these objectives achieved? Is there a positive input of 9.1 volts and a negative return to ground that is 30 volts above ground potential? Maybe I just don't understand the basic electrical theory and/or how the taps on a transformer work....
Sorry if this is an amateurish question.
Erik
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Follow Ups
- Re: Round 2 of YAWE91B300BA (warning bigpics) - longdrive55 01/21/0504:48:30 01/21/05 (1)
- Re: Round 2 of YAWE91B300BA (warning bigpics) - Thorsten 06:29:35 01/21/05 (0)
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