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DIY For Audio
Diagnosing power supply of SRPP
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<blockquote data-quote="handsome" data-source="post: 1084180" data-attributes="member: 772"><p>The PSU on that pre seems to be a zener-follower - this is a stabilised not filtered, supply. So pull the valves and measure the HT voltages - this will eliminate the valve's and their associated circuitry as problems and confirm that the PSU is indeed working properly. The asymmetrical waveform <em> could be </em> the valve being pushed out of its operating range - but you need to fist establish that the PSU is innocent. Post the schematic with the voltages marked including the voltages on each valves' cathodes and anodes.</p></blockquote><p></p>
[QUOTE="handsome, post: 1084180, member: 772"] The PSU on that pre seems to be a zener-follower - this is a stabilised not filtered, supply. So pull the valves and measure the HT voltages - this will eliminate the valve's and their associated circuitry as problems and confirm that the PSU is indeed working properly. The asymmetrical waveform [i] could be [/i] the valve being pushed out of its operating range - but you need to fist establish that the PSU is innocent. Post the schematic with the voltages marked including the voltages on each valves' cathodes and anodes. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Diagnosing power supply of SRPP
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