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Steinhart tvp502e integrated amp
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<blockquote data-quote="Ampdog" data-source="post: 96038" data-attributes="member: 144"><p>Och where the hell did I get those figures! (Sorry guys, another through-night here minding the Community Patrol Action's radio - too much time on hand!) and nobody noticed. MAAA! My mail is not read!</p><p></p><p>Yea series KT88 heaters will give 25,2V which leaves 14,8V to be dropped, but at 1,6A, not 300mA!! Yielding a resistor of 9,25 ohm at 15W. Thus say a 30W resistor, adjustable for the correct voltage.</p><p></p><p>I have seen amplifiers with like size resistors, and it might still be the easiest way out. The bulk of the heat will still come from the power tubes, and there may not be space for an extra 50W heater transformer. Decisions, decisions.....</p></blockquote><p></p>
[QUOTE="Ampdog, post: 96038, member: 144"] Och where the hell did I get those figures! (Sorry guys, another through-night here minding the Community Patrol Action's radio - too much time on hand!) and nobody noticed. MAAA! My mail is not read! Yea series KT88 heaters will give 25,2V which leaves 14,8V to be dropped, but at 1,6A, not 300mA!! Yielding a resistor of 9,25 ohm at 15W. Thus say a 30W resistor, adjustable for the correct voltage. I have seen amplifiers with like size resistors, and it might still be the easiest way out. The bulk of the heat will still come from the power tubes, and there may not be space for an extra 50W heater transformer. Decisions, decisions..... [/QUOTE]
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Steinhart tvp502e integrated amp
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