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Tube DIY Asylum: Seeking advice on my first shot in designing a 5842 DC'ed to 45 by arnoldc Do It Yourself (DIY) paradise for tube and SET project builders. |
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Hi, I would like to seek advice if what i have came up with is correct.Sorry for the poor photo above of the diagram but I hope it would help. Based on some formulas i've gathered, I came up with:
My operating point for the 5842 driver stage is as follows -
Plate voltage of 98.5V current of 20mA and bias of 1.5V
Rk = 75 ohm (1.5V / 20mA)
Bypass cap is 470uF from C = 159 / (5 * 0.075) = ~ 424uF
My operating point for the 45 is as follows -
Plate voltage of 275V at 36mA
I calculated Rk of 4,166 ohms which will give me a cathode to ground of 150V
My B+ is 150V + 275 (plate to cathode) = 425
Grid voltage is -50, so 150V - 50V (grid to cathode) = 100V which is provided by the voltage divider made up of 220K and 68K resistors.
Am i on the right track or I completely lost it?
Appreciate any help. Thanks!
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Topic - Seeking advice on my first shot in designing a 5842 DC'ed to 45 - arnoldc 18:29:10 08/18/03 ( 21)
- TAKING IT TO the NEXT LEVEL? - fewf 07:46:56 08/20/03 ( 2)
- Axiom it? - Ronnie Ericsson 00:48:15 08/21/03 ( 0)
- Monkey it? (NT) - Kuei Yang Wang 10:11:24 08/20/03 ( 0)
Re: Seeking advice on my first shot in designing a 5842 DC'ed to 45 - Kuei Yang Wang 03:36:56 08/19/03 ( 11)
- Re: Seeking advice on my first shot in designing a 5842 DC'ed to 45 - Dave Cigna 05:37:38 08/20/03 ( 2)
- Instability? Nah. - Brian C. 11:14:36 08/24/03 ( 0)
- Re: Seeking advice on my first shot in designing a 5842 DC'ed to 45 - Kuei Yang Wang 06:24:01 08/20/03 ( 0)
Here's the schematic - did i get it right? - arnoldc 17:59:41 08/19/03 ( 4)
- Re: Here's the schematic - did i get it right? - Kuei Yang Wang 01:21:15 08/20/03 ( 3)
- Sorry!! Wrong schematic, it should be this one... - arnoldc 03:05:09 08/20/03 ( 2)
- Re: Sorry!! Wrong schematic, it should be this one... - Kuei Yang Wang 03:39:57 08/20/03 ( 1)
- Re: Sorry!! Wrong schematic, it should be this one... - arnoldc 03:50:59 08/20/03 ( 0)
Re: On bypass caps..... - Derick 12:55:30 08/19/03 ( 0)
Re: Seeking advice on my first shot in designing a 5842 DC'ed to 45 - arnoldc 08:26:49 08/19/03 ( 1)
- Re: Seeking advice on my first shot in designing a 5842 DC'ed to 45 - Kuei Yang Wang 10:59:08 08/19/03 ( 0)
Cathode bypass - Paul Joppa 20:57:47 08/18/03 ( 3)
- Re: Cathode bypass - arnoldc 08:29:17 08/19/03 ( 2)
- Re: Cathode bypass - Paul Joppa 17:50:32 08/19/03 ( 1)
- Re: Cathode bypass - arnoldc 18:06:15 08/19/03 ( 0)
Re: Seeking advice on my first shot in designing a 5842 DC'ed to 45 - elan120 19:58:21 08/18/03 ( 1)
- Re: Seeking advice on my first shot in designing a 5842 DC'ed to 45 - arnoldc 21:07:56 08/18/03 ( 0)