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Old 5th December 2009, 09:15 PM   #1
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Default please help me change this

this is my first time doing a amp and i want to make a vox ac30 clone (but not down to every lil thing) here is the diagram
AC30schematicbetter.jpg picture by spiderweblw - Photobucket
all the way to the left are the 6 input but i would like to get rid of the last two the vib/trem ones. so can any one help me change it
thank you
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Old 6th December 2009, 12:47 AM   #2
Cassiel is offline Cassiel  Libya
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Get rid of the tremolo circuit?, is that what you mean?
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Old 6th December 2009, 02:03 AM   #3
llwhtt is offline llwhtt  United States
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By not using the vib/trem circuit you will be eliminating many parts and making it a much easier amp to clone. First scrap all the circuitry in and around V3, the input stage and part of vib/trem circuit. Next scrap all of the circuitry in and around V4, that's the modulator for the vib/trem circuit. Next scrap all of the circuitry in and around V5, that's the oscillator and phase splitter for the vib/trem circuitry. All of that circuitry finally ends up feeding the right side of V6, the phase splitter, through an RC network or high pass filter made up of several .0047uf (4n7) capacitors and 1 meg resistors, scrap all of the .0047 (4n7) caps and the 1 meg resistors and the 500k(470k) volume control, leave the .047uf (47n). The high pass filter was there to eliminate the very low frequency from the oscillator which runs at approx. 6,7, or 8Hz depending on the speed switch. Now the right side of the phase splitter is open with only the .047uf (47n) connected to it. Next connect the end of the .047uf (47n) that was connected to the wiper of the volume control to ground. I've built probably over 150 AC15/30 clones in the past few years, very very popular amplifiers providing you use the Celestion Blue Alnico speakers.

Craig
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Old 6th December 2009, 03:13 PM   #4
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Quote:
Originally Posted by llwhtt View Post
By not using the vib/trem circuit you will be eliminating many parts and making it a much easier amp to clone. First scrap all the circuitry in and around V3, the input stage and part of vib/trem circuit. Next scrap all of the circuitry in and around V4, that's the modulator for the vib/trem circuit. Next scrap all of the circuitry in and around V5, that's the oscillator and phase splitter for the vib/trem circuitry. All of that circuitry finally ends up feeding the right side of V6, the phase splitter, through an RC network or high pass filter made up of several .0047uf (4n7) capacitors and 1 meg resistors, scrap all of the .0047 (4n7) caps and the 1 meg resistors and the 500k(470k) volume control, leave the .047uf (47n). The high pass filter was there to eliminate the very low frequency from the oscillator which runs at approx. 6,7, or 8Hz depending on the speed switch. Now the right side of the phase splitter is open with only the .047uf (47n) connected to it. Next connect the end of the .047uf (47n) that was connected to the wiper of the volume control to ground. I've built probably over 150 AC15/30 clones in the past few years, very very popular amplifiers providing you use the Celestion Blue Alnico speakers.

Craig
thank you very much i will posting pics when it is done
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