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11th January 2006, 07:33 AM
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#1 |
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diyAudio Member
Join Date: Dec 2003
Location: New Zealand
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PX25 SE without NFB
Hi
 I had a good look through Google and I also tried searching through this forum but all I found are 3 schematics for PX25 SE. Two of them are from Japanese DIYers and they both used negative feedback... Does anybody know or have a PX25 SE circuit without NFB...? Thanks James |
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11th January 2006, 11:31 PM
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#2 |
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diyAudio Member
Join Date: Jul 2002
Location: New Zealand
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Hey James
All you need is a driver circuit grunty enough- how about this: Per channel- 1/2 12AU7->6SN7(both halves paralleled)->PX25 I have some data for this somewhere... It should be able to drive any triode, just adjust the plate voltage/cathode resistor/PX25 grid resistor and you would be away... I have great respect for the designer (schematic description in the first post of this thread) Just remove the loop feddback and you are good to go... |
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12th January 2006, 03:33 AM
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#3 |
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diyAudio Member
Join Date: Dec 2003
Location: New Zealand
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Hi SHiFTY,
Good to see you again Actually I've just found this design with switchable NFB, which gives me both options... http://www2u.biglobe.ne.jp/~tossie/PX25SE-E.html I also have a U18 as used in that design, but I'll probably go with a GZ37 cause it has soft start... BTW do you prefer the sound of EF37A to a Z729...? |
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