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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Project 165
Hi, a few weeks ago, the issue of output valve matching was raised by NG regular Trevor Wilson in a post relating to the Peavey Classic 60. In a subsequent post he mentioned the AVO VCM163 - the last and possibly best valve tester made by that famous brand. Intrigued by the unique method employed by the AVO, I experimented with various circuit lash ups on my bench and after a few stages of evolution and using a couple of bright ideas of my own wound up with a very handy output valve tester capable of doing bias matching and far, far more. My prototype tester is now pictured & fully described on the ESP web site by my good mate Rod Elliot as "Project 165". http://sound.westhost.com/project165.htm My example was built using a small plastic box and other bits lying around the workshop and employs externally a standard 240:240 isolation transformer, a Variac, a couple of DC bench supplies for heaters and negative grid bias plus dual trace scope and DMM. It performs equally well using a DSO like the Rigol or a regular analogue job like my ancient BWD821 for waveform monitoring. Please take note of the SAFETY WARNINGS - this is NOT a project for beginners or clever folk who like to take short cuts. Questions and comments welcome .... ..... Phil |
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Project 165
On Thu, 11 Feb 2016 03:52:40 -0800 (PST) Phil Allison
wrote in Message id: : Hi, a few weeks ago, the issue of output valve matching was raised by NG regular Trevor Wilson in a post relating to the Peavey Classic 60. In a subsequent post he mentioned the AVO VCM163 - the last and possibly best valve tester made by that famous brand. Intrigued by the unique method employed by the AVO, I experimented with various circuit lash ups on my bench and after a few stages of evolution and using a couple of bright ideas of my own wound up with a very handy output valve tester capable of doing bias matching and far, far more. My prototype tester is now pictured & fully described on the ESP web site by my good mate Rod Elliot as "Project 165". http://sound.westhost.com/project165.htm My example was built using a small plastic box and other bits lying around the workshop and employs externally a standard 240:240 isolation transformer, a Variac, a couple of DC bench supplies for heaters and negative grid bias plus dual trace scope and DMM. It performs equally well using a DSO like the Rigol or a regular analogue job like my ancient BWD821 for waveform monitoring. Please take note of the SAFETY WARNINGS - this is NOT a project for beginners or clever folk who like to take short cuts. Questions and comments welcome .... A digital scope!!!??? Phil, I'm SHOCKED! Nice work, though. |
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