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Audio and Video Talk
Valves / Vacuum Tubes
Replacement valves needed for Little Dot version 1
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<blockquote data-quote="Ampdog" data-source="post: 745197" data-attributes="member: 144"><p><span style="color: red"><em><span style="font-size: 19px">WHAT??</span></em></span></p><p></p><p>In the late 40s we built battery operated radio superhets with typically 1R5, 1T4, 1S5 and 3S4. Typical output alll of 250 mW. Power: 1,5V cell. 67,5V sandwich "B" battery. Haven't heard of them since.</p><p></p><p>Cyzer, not to discourage you and wishing you well with the search, but .... not sure how to put it. It will be hard to find replacements since manufacture of these valves were stopped about 1960, in favour of then transistor radios or indirectly heated valves. It will thus also be just about impossible to 'rearrange' the circuit for any 'modern' type valve. I would say forget about what brand you can get and take what you can find. I am really surprised that these valves still appear in circuits. I peered at the photos to try detect a possible misunderstanding, but there they are in full glory: 1945-style battery valves,</p><p></p><p>(Charles: You will find then in very old editions of the RCA Receiving Tube Manual, otherwise under the Replacement Guide at the back of the Tube manual. I think listing was dropped later - not sure that there were RCA Receivinvg Tube Manuals after the 1970 edition. ) </p></blockquote><p></p>
[QUOTE="Ampdog, post: 745197, member: 144"] [color=red][i][SIZE=19px]WHAT??[/SIZE][/i][/color] In the late 40s we built battery operated radio superhets with typically 1R5, 1T4, 1S5 and 3S4. Typical output alll of 250 mW. Power: 1,5V cell. 67,5V sandwich "B" battery. Haven't heard of them since. Cyzer, not to discourage you and wishing you well with the search, but .... not sure how to put it. It will be hard to find replacements since manufacture of these valves were stopped about 1960, in favour of then transistor radios or indirectly heated valves. It will thus also be just about impossible to 'rearrange' the circuit for any 'modern' type valve. I would say forget about what brand you can get and take what you can find. I am really surprised that these valves still appear in circuits. I peered at the photos to try detect a possible misunderstanding, but there they are in full glory: 1945-style battery valves, (Charles: You will find then in very old editions of the RCA Receiving Tube Manual, otherwise under the Replacement Guide at the back of the Tube manual. I think listing was dropped later - not sure that there were RCA Receivinvg Tube Manuals after the 1970 edition. ) [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Replacement valves needed for Little Dot version 1
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