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Audio and Video Talk
Valves / Vacuum Tubes
Ideas for MM valve phonostage
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<blockquote data-quote="Ampdog" data-source="post: 955719" data-attributes="member: 144"><p>I apologise for posts coming in spurts; won't bore with explanations.</p><p></p><p>Only regarding valve heaters in series, I am the bearer of negative news to boot. It has been mentioned before that to an unacceptable degree, valve heaters can notoriously differ in current consumption. </p><p></p><p>This to the extent that I was unable to connect e.g. ECF80s and E182CCs in series for easier application of a higher voltage lower current regulated supply. (In series with same numbers!) Some 'dropped' 5,5V, others >7V. (I do believe 12V heaters are more consistent but have no proof.) This is also a conditional statement: in the days of a.c./d.c. radios with the higher heater voltage heaters, they were specifically made to work successfully in series, i.e. draw the same current.) Thus I was forced to use a 6,3V 3A regulated power supply - stupid thing . . .</p><p></p><p>Hopefully others can respond to this with different experiences?</p><p></p><p>Then regarding heater connections on P.C. boards: twisted pair wire connections from valve socket to socket are often used below the p.c.; no connection via tracks - can also simplify component layout, connecting tracks etc. I would prefer that method.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 955719, member: 144"] I apologise for posts coming in spurts; won't bore with explanations. Only regarding valve heaters in series, I am the bearer of negative news to boot. It has been mentioned before that to an unacceptable degree, valve heaters can notoriously differ in current consumption. This to the extent that I was unable to connect e.g. ECF80s and E182CCs in series for easier application of a higher voltage lower current regulated supply. (In series with same numbers!) Some 'dropped' 5,5V, others >7V. (I do believe 12V heaters are more consistent but have no proof.) This is also a conditional statement: in the days of a.c./d.c. radios with the higher heater voltage heaters, they were specifically made to work successfully in series, i.e. draw the same current.) Thus I was forced to use a 6,3V 3A regulated power supply - stupid thing . . . Hopefully others can respond to this with different experiences? Then regarding heater connections on P.C. boards: twisted pair wire connections from valve socket to socket are often used below the p.c.; no connection via tracks - can also simplify component layout, connecting tracks etc. I would prefer that method. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Ideas for MM valve phonostage
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