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Steinhart tvp502e integrated amp
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<blockquote data-quote="Ampdog" data-source="post: 95570" data-attributes="member: 144"><p>At least, not without some work! To elucidate:</p><p></p><p>The heater voltage for a PL519 is 40V at 300mA. Pa = 40W and Pg2 = 5W. My search for other data came out blank.</p><p>I would believe a starting point would be 4 x KT88, where series heaters would take 25,2V - if the 14,8V rest @ 300mA is taken with a resistor, that would have to be 50 ohms at 10W.</p><p></p><p>Steinhart worked his valves at low voltage, high current - I believe the h.t. was no more than 250V. That would mean operation into a low anode-anode impedance. Unfortunately the valve Gm is not listed (not important for a tv switcher). The KT88 value of 11mS is one of the highest available, so would be my choice for a refurbishment, but the available output would be lower.</p><p></p><p>Whether this is worthwhile - as Hi-Phibian said.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 95570, member: 144"] At least, not without some work! To elucidate: The heater voltage for a PL519 is 40V at 300mA. Pa = 40W and Pg2 = 5W. My search for other data came out blank. I would believe a starting point would be 4 x KT88, where series heaters would take 25,2V - if the 14,8V rest @ 300mA is taken with a resistor, that would have to be 50 ohms at 10W. Steinhart worked his valves at low voltage, high current - I believe the h.t. was no more than 250V. That would mean operation into a low anode-anode impedance. Unfortunately the valve Gm is not listed (not important for a tv switcher). The KT88 value of 11mS is one of the highest available, so would be my choice for a refurbishment, but the available output would be lower. Whether this is worthwhile - as Hi-Phibian said. [/QUOTE]
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Steinhart tvp502e integrated amp
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