Hi dstockwell,
Your 200 uF cap is a pair of 100 uF's in parallel. It's rated at 500 VDC like the other dual 100 uF. You need the 500 V rating for the period in time before the outputs draw current and drop the supply voltage.
You may be able to get away with 450 VDC. With no tubes in circuit, install a smaller 500V cap and read the voltage. Also note the AC supply voltage and leave some safety headroom.
-Chris
Your 200 uF cap is a pair of 100 uF's in parallel. It's rated at 500 VDC like the other dual 100 uF. You need the 500 V rating for the period in time before the outputs draw current and drop the supply voltage.
You may be able to get away with 450 VDC. With no tubes in circuit, install a smaller 500V cap and read the voltage. Also note the AC supply voltage and leave some safety headroom.
-Chris
Hi dstockwell,
Also, after you have it running, note the level of hum in the output. Then try to bias the heater strings up to 30~40 VDC via a bleeder string from B+ to common, add a cap to common from the bias point.
Sometimes larger caps will generate a buzz due to the higher peak currents due to the higher capacitance.
-Chris
Also, after you have it running, note the level of hum in the output. Then try to bias the heater strings up to 30~40 VDC via a bleeder string from B+ to common, add a cap to common from the bias point.
Sometimes larger caps will generate a buzz due to the higher peak currents due to the higher capacitance.
-Chris
You install a 100 / 100 @ 500 in the 200 uF spot. You then install one section of 100 / 100 @ 500 in the two 100 uF spots. Or you can use four capacitors depending on layout and space.
That should do it. Again, you may be able to use 450V units instead of the 500V specified. Test and measure first.
-Chris
That should do it. Again, you may be able to use 450V units instead of the 500V specified. Test and measure first.
-Chris
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