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Audio and Video Talk
Valves / Vacuum Tubes
Dynaco ST-70
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<blockquote data-quote="Ampdog" data-source="post: 804207" data-attributes="member: 144"><p>Side remark:</p><p></p><p>I have not looked but if the input is 1,3V for full output, remember you will never run it at that. That would mean overload as soon as you exceed the figure. To stay clear of clipping you should have a suitable room volume with less than 50% of that. (Headroom and such.)</p><p></p><p>Perhaps heresy, but I have occasionally installed a small op-amp input 'pre-amp' in power amplifiers; gain of 2 - 5. Fits into a small metal enclosure; wired spider-web way. (Stuck the op-amp upside down to the borrom of the enclosure.) There is little danger of colouring the sound at that low level and can comfortably 'bridge' any 'lack-of-gain'. Supply voltage can be taken off the power valves' cathode voltage through an R.C for filtering.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 804207, member: 144"] Side remark: I have not looked but if the input is 1,3V for full output, remember you will never run it at that. That would mean overload as soon as you exceed the figure. To stay clear of clipping you should have a suitable room volume with less than 50% of that. (Headroom and such.) Perhaps heresy, but I have occasionally installed a small op-amp input 'pre-amp' in power amplifiers; gain of 2 - 5. Fits into a small metal enclosure; wired spider-web way. (Stuck the op-amp upside down to the borrom of the enclosure.) There is little danger of colouring the sound at that low level and can comfortably 'bridge' any 'lack-of-gain'. Supply voltage can be taken off the power valves' cathode voltage through an R.C for filtering. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Dynaco ST-70
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