Graziano
25th September 2012, 10:10 AM
Earlier this year my nephew was after a valve guitar amp and after picking up a box of 6CM5 valves fairly cheaply, I had a look round on the 'net for amp projects based around these valves and found: ECONOMICAL VALVE BASED AUDIO POWER AMPLIFIER (http://www.vk6fh.com/vk6fh/ECONOMICAL%20VALVE%20BASED%20AUDIO%20POWER%20AMPLIFIER.htm) and Grant Wills (http://home.alphalink.com.au/~cambie/6AN8amp/Grant_Wills_6CM5amp.htm)
I built a stereo version of the first amplifier fairly cheaply, probably well under $200 as I had most of the parts lying around already. It was fairly straight forward to make and after letting a few guitar players try it out the general consensus was that it was no good as a guitar amp: it sounded "too clean" and "no distortion there" which made sense as I built it with a fairly stiff power supply with plenty of 47 microfarad 400 volt electrolytics. I also used a 20 Watt PA transformer instead of the 15 Watt unit for the later guitar amp which should extend the ful power bandwidth a bit.
http://www.woodworkforums.com/attachments/f99/234077d1348528115-valve-amp-project-6cm5-amp15a.jpg
I built a stereo version of the first amplifier fairly cheaply, probably well under $200 as I had most of the parts lying around already. It was fairly straight forward to make and after letting a few guitar players try it out the general consensus was that it was no good as a guitar amp: it sounded "too clean" and "no distortion there" which made sense as I built it with a fairly stiff power supply with plenty of 47 microfarad 400 volt electrolytics. I also used a 20 Watt PA transformer instead of the 15 Watt unit for the later guitar amp which should extend the ful power bandwidth a bit.
http://www.woodworkforums.com/attachments/f99/234077d1348528115-valve-amp-project-6cm5-amp15a.jpg