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The Water Cooler
General Discussion
Anyone know how to tell if a Vacuum Tube is good?
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<blockquote data-quote="xnavychief" data-source="post: 1819558" data-attributes="member: 24455"><p>I happen to build amps around those very things(link below)....</p><p></p><p>Current production 12ax7 style twin triodes are available from many vendors but New Old Stock USA's are still what the gear heads want and pay dearly for. The problem is that unless you have flawless packaging with the original dividers it's hard to sell them as such. Most testers you'll find locally are of the emmission, short, parametrical variety which will tell you that the tube is functional, but a mutual conductance or dynamic conductance tester is the only way to validate true matching in a tube that has two separate three element tubes in it(twin triode) as they do.</p><p></p><p>If they are the standard green label long plate variety of sylvania that are so plentiful and test good you are looking at at easy $20 - $25 ea on ebay.</p><p></p><p>6AQ5's are the lower plate voltage/less dissipating predecessor of the more common 6Bq5 / el84 (used in vox ac15, 30's and all or Brad paisly DrZ rigs clones etc.) Not that many people build around them anymmore but very popular with early Gibson collectors. Worth about $30 a pair if authentic NOS.</p><p></p><p>Hope that helps.</p></blockquote><p></p>
[QUOTE="xnavychief, post: 1819558, member: 24455"] I happen to build amps around those very things(link below).... Current production 12ax7 style twin triodes are available from many vendors but New Old Stock USA's are still what the gear heads want and pay dearly for. The problem is that unless you have flawless packaging with the original dividers it's hard to sell them as such. Most testers you'll find locally are of the emmission, short, parametrical variety which will tell you that the tube is functional, but a mutual conductance or dynamic conductance tester is the only way to validate true matching in a tube that has two separate three element tubes in it(twin triode) as they do. If they are the standard green label long plate variety of sylvania that are so plentiful and test good you are looking at at easy $20 - $25 ea on ebay. 6AQ5's are the lower plate voltage/less dissipating predecessor of the more common 6Bq5 / el84 (used in vox ac15, 30's and all or Brad paisly DrZ rigs clones etc.) Not that many people build around them anymmore but very popular with early Gibson collectors. Worth about $30 a pair if authentic NOS. Hope that helps. [/QUOTE]
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The Water Cooler
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Anyone know how to tell if a Vacuum Tube is good?
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