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	<title>Válvula 12GB3 &#8211; Hobbytools &#8211; Ferramentas para hobbistas</title>
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	<title>Válvula 12GB3 &#8211; Hobbytools &#8211; Ferramentas para hobbistas</title>
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		<title>Válvula 12GB3</title>
		<link>https://www.hobbytools.com.br/produto/valvula-12gb3/</link>
					<comments>https://www.hobbytools.com.br/produto/valvula-12gb3/#respond</comments>
		
		<dc:creator><![CDATA[natali Montanhini]]></dc:creator>
		<pubDate>Mon, 13 Oct 2025 14:42:57 +0000</pubDate>
				<guid isPermaLink="false">https://www.hobbytools.com.br/?post_type=product&#038;p=4159</guid>

					<description><![CDATA[<p data-start="200" data-end="640">A <strong data-start="202" data-end="211">12GB3</strong> é uma <strong data-start="218" data-end="271">tetrodo de feixe de potência (beam power tetrode)</strong> desenvolvida para operação em <strong data-start="302" data-end="346">circuitos de deflexão horizontal (linha)</strong> de televisores e monitores valvulados, especialmente aqueles de 90° e 110°.<br data-start="422" data-end="425" />Ela é uma válvula robusta, capaz de lidar com <strong data-start="471" data-end="507">altas tensões de pico (até 7 kV)</strong> e <strong data-start="510" data-end="545">correntes instantâneas elevadas</strong>, projetada para trabalhar com <strong data-start="576" data-end="599">filamento de 12,6 V</strong> em aparelhos com aquecimento em série.</p>
<p data-start="642" data-end="824">A série <strong data-start="650" data-end="657">GB3</strong> inclui variações (6GB3, 12GB3, 17GB3, 23GB3) diferenciadas apenas pela tensão do filamento, sendo a 12GB3 adequada para equipamentos alimentados por redes de 117 V.</p>]]></description>
										<content:encoded><![CDATA[<h2 data-start="145" data-end="180">🧩 Ficha Técnica – Válvula 12GB3</h2>
<h3 data-start="182" data-end="199">📘 Introdução</h3>
<p data-start="200" data-end="640">A <strong data-start="202" data-end="211">12GB3</strong> é uma <strong data-start="218" data-end="271">tetrodo de feixe de potência (beam power tetrode)</strong> desenvolvida para operação em <strong data-start="302" data-end="346">circuitos de deflexão horizontal (linha)</strong> de televisores e monitores valvulados, especialmente aqueles de 90° e 110°.<br data-start="422" data-end="425" />Ela é uma válvula robusta, capaz de lidar com <strong data-start="471" data-end="507">altas tensões de pico (até 7 kV)</strong> e <strong data-start="510" data-end="545">correntes instantâneas elevadas</strong>, projetada para trabalhar com <strong data-start="576" data-end="599">filamento de 12,6 V</strong> em aparelhos com aquecimento em série.</p>
<p data-start="642" data-end="824">A série <strong data-start="650" data-end="657">GB3</strong> inclui variações (6GB3, 12GB3, 17GB3, 23GB3) diferenciadas apenas pela tensão do filamento, sendo a 12GB3 adequada para equipamentos alimentados por redes de 117 V.</p>
<hr data-start="826" data-end="829" />
<h3 data-start="831" data-end="855">⚙️ Estrutura Interna</h3>
<ul data-start="856" data-end="1206">
<li data-start="856" data-end="916">
<p data-start="858" data-end="916">Tipo: <strong data-start="864" data-end="914">Tetrodo de feixe direcionado (Beam Power Tube)</strong></p>
</li>
<li data-start="917" data-end="1012">
<p data-start="919" data-end="1012">Elementos: Placa, Grade de Controle (G1), Grade de Tela (G2), Cátodo, Feixes direcionadores</p>
</li>
<li data-start="1013" data-end="1065">
<p data-start="1015" data-end="1065">Aquecimento indireto, base <strong data-start="1042" data-end="1063">Compactron (B12C)</strong></p>
</li>
<li data-start="1066" data-end="1116">
<p data-start="1068" data-end="1116">Invólucro de vidro de alta isolação dielétrica</p>
</li>
<li data-start="1117" data-end="1206">
<p data-start="1119" data-end="1206">Construção otimizada para suportar picos de corrente e tensão em operação com flyback</p>
</li>
</ul>
<hr data-start="1208" data-end="1211" />
<h3 data-start="1213" data-end="1242">⚙️ Características Gerais</h3>
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<thead data-start="1243" data-end="1264">
<tr data-start="1243" data-end="1264">
<th data-start="1243" data-end="1255" data-col-size="sm">Parâmetro</th>
<th data-start="1255" data-end="1264" data-col-size="md">Valor</th>
</tr>
</thead>
<tbody data-start="1288" data-end="1884">
<tr data-start="1288" data-end="1327">
<td data-start="1288" data-end="1295" data-col-size="sm">Tipo</td>
<td data-start="1295" data-end="1327" data-col-size="md">Tetrodo de feixe de potência</td>
</tr>
<tr data-start="1328" data-end="1394">
<td data-start="1328" data-end="1347" data-col-size="sm">Aplicação típica</td>
<td data-col-size="md" data-start="1347" data-end="1394">Saída horizontal / amplificador de potência</td>
</tr>
<tr data-start="1395" data-end="1441">
<td data-start="1395" data-end="1408" data-col-size="sm">Envoltório</td>
<td data-col-size="md" data-start="1408" data-end="1441">Vidro – Compactron (12 pinos)</td>
</tr>
<tr data-start="1442" data-end="1478">
<td data-start="1442" data-end="1454" data-col-size="sm">Filamento</td>
<td data-col-size="md" data-start="1454" data-end="1478">Aquecimento indireto</td>
</tr>
<tr data-start="1479" data-end="1518">
<td data-start="1479" data-end="1508" data-col-size="sm">Tensão de aquecimento (Uf)</td>
<td data-col-size="md" data-start="1508" data-end="1518">12,6 V</td>
</tr>
<tr data-start="1519" data-end="1559">
<td data-start="1519" data-end="1550" data-col-size="sm">Corrente de aquecimento (If)</td>
<td data-col-size="md" data-start="1550" data-end="1559">0,6 A</td>
</tr>
<tr data-start="1560" data-end="1632">
<td data-start="1560" data-end="1595" data-col-size="sm">Tensão máxima da placa (Va máx.)</td>
<td data-col-size="md" data-start="1595" data-end="1632">900 V contínuos / 7.000 V de pico</td>
</tr>
<tr data-start="1633" data-end="1677">
<td data-start="1633" data-end="1668" data-col-size="sm">Tensão máxima da tela (Vg2 máx.)</td>
<td data-col-size="md" data-start="1668" data-end="1677">300 V</td>
</tr>
<tr data-start="1678" data-end="1714">
<td data-start="1678" data-end="1704" data-col-size="sm">Corrente média da placa</td>
<td data-col-size="md" data-start="1704" data-end="1714">130 mA</td>
</tr>
<tr data-start="1715" data-end="1752">
<td data-start="1715" data-end="1743" data-col-size="sm">Corrente de pico da placa</td>
<td data-col-size="md" data-start="1743" data-end="1752">1,0 A</td>
</tr>
<tr data-start="1753" data-end="1790">
<td data-start="1753" data-end="1782" data-col-size="sm">Dissipação máxima da placa</td>
<td data-col-size="md" data-start="1782" data-end="1790">18 W</td>
</tr>
<tr data-start="1791" data-end="1828">
<td data-start="1791" data-end="1819" data-col-size="sm">Dissipação máxima da tela</td>
<td data-col-size="md" data-start="1819" data-end="1828">2,5 W</td>
</tr>
<tr data-start="1829" data-end="1857">
<td data-start="1829" data-end="1836" data-col-size="sm">Base</td>
<td data-start="1836" data-end="1857" data-col-size="md">Compactron (B12C)</td>
</tr>
<tr data-start="1858" data-end="1884">
<td data-start="1858" data-end="1876" data-col-size="sm">Peso aproximado</td>
<td data-col-size="md" data-start="1876" data-end="1884">25 g</td>
</tr>
</tbody>
</table>
</div>
</div>
<hr data-start="1886" data-end="1889" />
<h3 data-start="1891" data-end="1933">⚡ Dados de Operação – Classe A (Áudio)</h3>
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<table class="w-fit min-w-(--thread-content-width)" data-start="1934" data-end="2283">
<thead data-start="1934" data-end="1955">
<tr data-start="1934" data-end="1955">
<th data-start="1934" data-end="1946" data-col-size="sm">Parâmetro</th>
<th data-start="1946" data-end="1955" data-col-size="sm">Valor</th>
</tr>
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<tbody data-start="1979" data-end="2283">
<tr data-start="1979" data-end="2011">
<td data-start="1979" data-end="2002" data-col-size="sm">Tensão de placa (Va)</td>
<td data-col-size="sm" data-start="2002" data-end="2011">250 V</td>
</tr>
<tr data-start="2012" data-end="2044">
<td data-start="2012" data-end="2035" data-col-size="sm">Tensão de tela (Vg2)</td>
<td data-col-size="sm" data-start="2035" data-end="2044">250 V</td>
</tr>
<tr data-start="2045" data-end="2078">
<td data-start="2045" data-end="2069" data-col-size="sm">Tensão de grade (Vg1)</td>
<td data-col-size="sm" data-start="2069" data-end="2078">–14 V</td>
</tr>
<tr data-start="2079" data-end="2113">
<td data-start="2079" data-end="2104" data-col-size="sm">Corrente de placa (Ia)</td>
<td data-col-size="sm" data-start="2104" data-end="2113">60 mA</td>
</tr>
<tr data-start="2114" data-end="2147">
<td data-start="2114" data-end="2139" data-col-size="sm">Corrente de tela (Ig2)</td>
<td data-col-size="sm" data-start="2139" data-end="2147">5 mA</td>
</tr>
<tr data-start="2148" data-end="2177">
<td data-start="2148" data-end="2168" data-col-size="sm">Potência de saída</td>
<td data-col-size="sm" data-start="2168" data-end="2177">6,5 W</td>
</tr>
<tr data-start="2178" data-end="2207">
<td data-start="2178" data-end="2200" data-col-size="sm">Distorção harmônica</td>
<td data-col-size="sm" data-start="2200" data-end="2207">8 %</td>
</tr>
<tr data-start="2208" data-end="2246">
<td data-start="2208" data-end="2232" data-col-size="sm">Transcondutância (gm)</td>
<td data-col-size="sm" data-start="2232" data-end="2246">7.500 µmho</td>
</tr>
<tr data-start="2247" data-end="2283">
<td data-start="2247" data-end="2275" data-col-size="sm">Impedância de carga ótima</td>
<td data-col-size="sm" data-start="2275" data-end="2283">5 kΩ</td>
</tr>
</tbody>
</table>
</div>
</div>
<hr data-start="2285" data-end="2288" />
<h3 data-start="2290" data-end="2337">⚡ Dados de Operação – Saída Horizontal (TV)</h3>
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<table class="w-fit min-w-(--thread-content-width)" data-start="2338" data-end="2604">
<thead data-start="2338" data-end="2359">
<tr data-start="2338" data-end="2359">
<th data-start="2338" data-end="2350" data-col-size="sm">Parâmetro</th>
<th data-start="2350" data-end="2359" data-col-size="sm">Valor</th>
</tr>
</thead>
<tbody data-start="2383" data-end="2604">
<tr data-start="2383" data-end="2419">
<td data-start="2383" data-end="2408" data-col-size="sm">Tensão de placa (pico)</td>
<td data-col-size="sm" data-start="2408" data-end="2419">7.000 V</td>
</tr>
<tr data-start="2420" data-end="2457">
<td data-start="2420" data-end="2448" data-col-size="sm">Corrente de pico de placa</td>
<td data-col-size="sm" data-start="2448" data-end="2457">1,0 A</td>
</tr>
<tr data-start="2458" data-end="2494">
<td data-start="2458" data-end="2484" data-col-size="sm">Corrente média de feixe</td>
<td data-col-size="sm" data-start="2484" data-end="2494">130 mA</td>
</tr>
<tr data-start="2495" data-end="2528">
<td data-start="2495" data-end="2519" data-col-size="sm">Tensão de tela (pico)</td>
<td data-col-size="sm" data-start="2519" data-end="2528">600 V</td>
</tr>
<tr data-start="2529" data-end="2567">
<td data-start="2529" data-end="2554" data-col-size="sm">Frequência de operação</td>
<td data-col-size="sm" data-start="2554" data-end="2567">15,75 kHz</td>
</tr>
<tr data-start="2568" data-end="2604">
<td data-start="2568" data-end="2596" data-col-size="sm">Dissipação média da placa</td>
<td data-col-size="sm" data-start="2596" data-end="2604">17 W</td>
</tr>
</tbody>
</table>
</div>
</div>
<hr data-start="2606" data-end="2609" />
<h3 data-start="2611" data-end="2648">🔌 Pinagem – Base Compactron B12C</h3>
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<table class="w-fit min-w-(--thread-content-width)" data-start="2649" data-end="2957">
<thead data-start="2649" data-end="2667">
<tr data-start="2649" data-end="2667">
<th data-start="2649" data-end="2656" data-col-size="sm">Pino</th>
<th data-start="2656" data-end="2667" data-col-size="sm">Conexão</th>
</tr>
</thead>
<tbody data-start="2688" data-end="2957">
<tr data-start="2688" data-end="2726">
<td data-start="2688" data-end="2692" data-col-size="sm">1</td>
<td data-col-size="sm" data-start="2692" data-end="2726">Cátodo + Feixes direcionadores</td>
</tr>
<tr data-start="2727" data-end="2757">
<td data-start="2727" data-end="2731" data-col-size="sm">2</td>
<td data-col-size="sm" data-start="2731" data-end="2757">Grade de controle (G1)</td>
</tr>
<tr data-start="2758" data-end="2784">
<td data-start="2758" data-end="2762" data-col-size="sm">3</td>
<td data-col-size="sm" data-start="2762" data-end="2784">Grade de tela (G2)</td>
</tr>
<tr data-start="2785" data-end="2798">
<td data-start="2785" data-end="2789" data-col-size="sm">4</td>
<td data-start="2789" data-end="2798" data-col-size="sm">Placa</td>
</tr>
<tr data-start="2799" data-end="2818">
<td data-start="2799" data-end="2803" data-col-size="sm">5</td>
<td data-col-size="sm" data-start="2803" data-end="2818">Sem conexão</td>
</tr>
<tr data-start="2819" data-end="2838">
<td data-start="2819" data-end="2823" data-col-size="sm">6</td>
<td data-col-size="sm" data-start="2823" data-end="2838">Sem conexão</td>
</tr>
<tr data-start="2839" data-end="2858">
<td data-start="2839" data-end="2843" data-col-size="sm">7</td>
<td data-col-size="sm" data-start="2843" data-end="2858">Sem conexão</td>
</tr>
<tr data-start="2859" data-end="2876">
<td data-start="2859" data-end="2863" data-col-size="sm">8</td>
<td data-col-size="sm" data-start="2863" data-end="2876">Filamento</td>
</tr>
<tr data-start="2877" data-end="2894">
<td data-start="2877" data-end="2881" data-col-size="sm">9</td>
<td data-start="2881" data-end="2894" data-col-size="sm">Filamento</td>
</tr>
<tr data-start="2895" data-end="2915">
<td data-start="2895" data-end="2900" data-col-size="sm">10</td>
<td data-start="2900" data-end="2915" data-col-size="sm">Sem conexão</td>
</tr>
<tr data-start="2916" data-end="2936">
<td data-start="2916" data-end="2921" data-col-size="sm">11</td>
<td data-col-size="sm" data-start="2921" data-end="2936">Sem conexão</td>
</tr>
<tr data-start="2937" data-end="2957">
<td data-start="2937" data-end="2942" data-col-size="sm">12</td>
<td data-start="2942" data-end="2957" data-col-size="sm">Sem conexão</td>
</tr>
</tbody>
</table>
</div>
</div>
<blockquote data-start="2959" data-end="3076">
<p data-start="2961" data-end="3076"><em data-start="2961" data-end="2968">Nota:</em> Filamento entre <strong data-start="2985" data-end="3000">pinos 8 e 9</strong>.<br data-start="3001" data-end="3004" />O cátodo e os feixes direcionadores estão interligados internamente.</p>
</blockquote>
<hr data-start="3078" data-end="3081" />
<h3 data-start="3083" data-end="3108">🧠 Aplicações Típicas</h3>
<ul data-start="3109" data-end="3405">
<li data-start="3109" data-end="3190">
<p data-start="3111" data-end="3190">Estágio de <strong data-start="3122" data-end="3145">deflexão horizontal</strong> em televisores preto e branco e coloridos.</p>
</li>
<li data-start="3191" data-end="3273">
<p data-start="3193" data-end="3273"><strong data-start="3193" data-end="3220">Amplificadores de áudio</strong> classe A ou AB, com som encorpado e timbre quente.</p>
</li>
<li data-start="3274" data-end="3337">
<p data-start="3276" data-end="3337"><strong data-start="3276" data-end="3311">Fontes de alta tensão (flyback)</strong> e osciladores lineares.</p>
</li>
<li data-start="3338" data-end="3405">
<p data-start="3340" data-end="3405"><strong data-start="3340" data-end="3372">Conversores e moduladores RF</strong> em equipamentos experimentais.</p>
</li>
</ul>
<hr data-start="3407" data-end="3410" />
<h3 data-start="3412" data-end="3447">🔁 Equivalentes e Substituições</h3>
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<thead data-start="3448" data-end="3483">
<tr data-start="3448" data-end="3483">
<th data-start="3448" data-end="3457" data-col-size="sm">Modelo</th>
<th data-start="3457" data-end="3483" data-col-size="md">Diferença / Observação</th>
</tr>
</thead>
<tbody data-start="3520" data-end="3802">
<tr data-start="3520" data-end="3561">
<td data-start="3520" data-end="3527" data-col-size="sm">6GB3</td>
<td data-col-size="md" data-start="3527" data-end="3561">Mesmo tipo, filamento de 6,3 V</td>
</tr>
<tr data-start="3562" data-end="3603">
<td data-start="3562" data-end="3570" data-col-size="sm">17GB3</td>
<td data-col-size="md" data-start="3570" data-end="3603">Mesmo tipo, filamento de 17 V</td>
</tr>
<tr data-start="3604" data-end="3632">
<td data-start="3604" data-end="3612" data-col-size="sm">23GB3</td>
<td data-col-size="md" data-start="3612" data-end="3632">Versão para 23 V</td>
</tr>
<tr data-start="3633" data-end="3692">
<td data-start="3633" data-end="3642" data-col-size="sm">12GB3A</td>
<td data-col-size="md" data-start="3642" data-end="3692">Versão aprimorada com maior resistência a arco</td>
</tr>
<tr data-start="3693" data-end="3743">
<td data-start="3693" data-end="3700" data-col-size="sm">6KD6</td>
<td data-col-size="md" data-start="3700" data-end="3743">Similar com potência ligeiramente maior</td>
</tr>
<tr data-start="3744" data-end="3802">
<td data-start="3744" data-end="3760" data-col-size="sm">PL509 / PL519</td>
<td data-col-size="md" data-start="3760" data-end="3802">Equivalentes europeus (base diferente)</td>
</tr>
</tbody>
</table>
</div>
</div>
<hr data-start="3804" data-end="3807" />
<h3 data-start="3809" data-end="3836">⚠️ Cuidados de Operação</h3>
<ul data-start="3837" data-end="4198">
<li data-start="3837" data-end="3920">
<p data-start="3839" data-end="3920">Trabalha com <strong data-start="3852" data-end="3878">altas tensões (&gt; 7 kV)</strong> — requer isolamento e soquete cerâmico.</p>
</li>
<li data-start="3921" data-end="3992">
<p data-start="3923" data-end="3992">Evitar operação sem carga (sem flyback ou transformador conectado).</p>
</li>
<li data-start="3993" data-end="4071">
<p data-start="3995" data-end="4071">Utilizar resistor de grade (“grid stopper”) em G1 (4,7 kΩ) e em G2 (1 kΩ).</p>
</li>
<li data-start="4072" data-end="4140">
<p data-start="4074" data-end="4140">Garantir boa ventilação do chassi; dissipação térmica é elevada.</p>
</li>
<li data-start="4141" data-end="4198">
<p data-start="4143" data-end="4198">Tempo de aquecimento mínimo antes da carga: <strong data-start="4187" data-end="4195">20 s</strong>.</p>
</li>
</ul>
<hr data-start="4200" data-end="4203" />
<h3 data-start="4205" data-end="4246">📈 Curvas Características (descrição)</h3>
<ul data-start="4247" data-end="4486">
<li data-start="4247" data-end="4343">
<p data-start="4249" data-end="4343"><strong data-start="4249" data-end="4276">Ia × Va (G2 constante):</strong> comportamento linear até 300 V; saturação progressiva até 600 V.</p>
</li>
<li data-start="4344" data-end="4423">
<p data-start="4346" data-end="4423"><strong data-start="4346" data-end="4359">Ia × Vg1:</strong> corte em torno de –22 V; operação linear entre –10 V e –18 V.</p>
</li>
<li data-start="4424" data-end="4486">
<p data-start="4426" data-end="4486"><strong data-start="4426" data-end="4444">Curva de pico:</strong> suporta pulsos de 1 A sem arco interno.</p>
</li>
</ul>
<hr data-start="4488" data-end="4491" />
<h3 data-start="4493" data-end="4522">🧾 Observações Históricas</h3>
<p data-start="4523" data-end="4810">A <strong data-start="4525" data-end="4534">12GB3</strong> foi lançada por <strong data-start="4551" data-end="4558">RCA</strong> e <strong data-start="4561" data-end="4573">Sylvania</strong> na década de <strong data-start="4587" data-end="4595">1960</strong>, como parte da família <strong data-start="4619" data-end="4626">GB3</strong> de válvulas de deflexão horizontal, substituindo as séries 6DQ6 e 12DQ6.<br data-start="4699" data-end="4702" />Projetada para os novos televisores de 110° de deflexão, tornou-se um padrão de robustez e confiabilidade.</p>
<p data-start="4812" data-end="5084">Hoje, é procurada por <strong data-start="4834" data-end="4874">restauradores de televisores vintage</strong> e <strong data-start="4877" data-end="4895">audiodesigners</strong> que apreciam seu timbre forte e capacidade de entrega de corrente.<br data-start="4962" data-end="4965" />Em amplificadores experimentais, a 12GB3 oferece <strong data-start="5014" data-end="5042">alta potência e dinâmica</strong>, mantendo excelente estabilidade térmica.</p>
<p data-start="4812" data-end="5084"><a href="https://www.hobbytools.com.br/wp-content/uploads/2025/10/DATASHEET-VALVULA-12gb3.pdf">DATASHEET VALVULA 12gb3</a></p>
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