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Old 18th October 2009, 07:42 PM   #1
Ryssen is offline Ryssen  Sweden
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Default Need to regulate 450v --> 300v

I want to use one transistor (mosfet?)and zeners.
the currentvis about 20mA at the 300v.
How?
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Old 18th October 2009, 08:31 PM   #2
Arnulf is offline Arnulf  Europe
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Replace BJT with a MOSFET in this schematic. Add a capacitor (100 uF or so) in parallel with the zener chain if you want a "soft start" for B+ on top of regulation.
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Old 18th October 2009, 09:22 PM   #3
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Don't forget a small heatsink. You're burning three watts.
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Old 18th October 2009, 09:39 PM   #4
Ryssen is offline Ryssen  Sweden
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Ok,thanks.
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Old 19th October 2009, 05:27 PM   #5
Tetrode is offline Tetrode  United States
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Use a 6L6.

Look at the Grommes 260A for an example.
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Old 19th October 2009, 10:58 PM   #6
Gordy is offline Gordy  United Kingdom
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Tetrode means this one: Schematic - Grommes 260-A Tube Amplifier @ AmpsLab.com

6L6 open loop voltage reduction located near output transformer on the schematic.
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Old 19th October 2009, 11:46 PM   #7
Ryssen is offline Ryssen  Sweden
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Quote:
Use a 6L6
Hmm,yes that way I get the heat ontop of the chassie and I get softstart,yes maybee..
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Old 20th October 2009, 12:14 AM   #8
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Quote:
Originally Posted by Ryssen View Post
Hmm,yes that way I get the heat ontop of the chassie and I get softstart,yes maybee..
Like this:

You can use EITHER the tube or the MOSFET, whatever is your preference.
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File Type: pdf tubereg EL84 circuit.pdf (6.8 KB, 107 views)
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Last edited by jan.didden; 20th October 2009 at 12:19 AM.
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Old 20th October 2009, 12:18 AM   #9
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.... or with a 6582 or 6080:

and get this performance:

http://www.linearaudio.nl/t-reg-1.htm

jd
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Old 20th October 2009, 03:23 PM   #10
Ryssen is offline Ryssen  Sweden
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I´will use a SS rectifier and a CLC filter,is it okay to use the 6L6 before the CLC?
I mean so the CLC get a soft start..or best to have it after?
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