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Audio and Video Talk
Valves / Vacuum Tubes
100 watt push-pull fixed bias amplifier
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<blockquote data-quote="Mars" data-source="post: 858276" data-attributes="member: 817"><p>I have dabbling with fixed bias output stages in an attempt to get more power output for less sensitive speakers. The EICO HF60 caught my attention, since it has a 6SN7 phase inverter, as opposed to the high gain Mullard 5-20. Here is a schematic of the circuit:</p><p></p><p><img src="http://2.bp.blogspot.com/-5qB3wxDGKGg/T_9gaNk31pI/AAAAAAAAAbo/zJsDmqfuYEE/s1600/Eico_HF60_schem.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>This article (<a href="http://tronola.com/html/hf-60_with_6550s.html" target="_blank">http://tronola.com/html/hf-60_with_6550s.html</a>) discusses possible improvements and modifying ideas. I used some of them in this build. The power supply is my own design (regular bridge/cap/inductor/cap) PI filter.</p><p></p><p><a href="https://flic.kr/p/JvDPBB" target="_blank"><img src="https://farm1.staticflickr.com/892/27902541957_b50ab79dae_b.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a><a href="https://flic.kr/p/JvDPBB" target="_blank">Mars 100</a> by <a href="https://www.flickr.com/photos/marsamps/" target="_blank">Karel Mars</a>, on Flickr</p><p></p><p>After a bit of to and fro', the sound is settling beautifully. The EF37's were chosen in stead of EF86, since I recently acquired a whole hoard of EF37's that begged to be used. KT66's were handy, since the 6550's are still on order. A very appealing sound. If you like music loud, this may be the way to go.</p></blockquote><p></p>
[QUOTE="Mars, post: 858276, member: 817"] I have dabbling with fixed bias output stages in an attempt to get more power output for less sensitive speakers. The EICO HF60 caught my attention, since it has a 6SN7 phase inverter, as opposed to the high gain Mullard 5-20. Here is a schematic of the circuit: [IMG]http://2.bp.blogspot.com/-5qB3wxDGKGg/T_9gaNk31pI/AAAAAAAAAbo/zJsDmqfuYEE/s1600/Eico_HF60_schem.jpg[/IMG] This article ([url=http://tronola.com/html/hf-60_with_6550s.html]http://tronola.com/html/hf-60_with_6550s.html[/url]) discusses possible improvements and modifying ideas. I used some of them in this build. The power supply is my own design (regular bridge/cap/inductor/cap) PI filter. [url=https://flic.kr/p/JvDPBB][IMG]https://farm1.staticflickr.com/892/27902541957_b50ab79dae_b.jpg[/IMG][/url][url=https://flic.kr/p/JvDPBB]Mars 100[/url] by [url=https://www.flickr.com/photos/marsamps/]Karel Mars[/url], on Flickr After a bit of to and fro', the sound is settling beautifully. The EF37's were chosen in stead of EF86, since I recently acquired a whole hoard of EF37's that begged to be used. KT66's were handy, since the 6550's are still on order. A very appealing sound. If you like music loud, this may be the way to go. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
100 watt push-pull fixed bias amplifier
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