You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

Taking a look at the filter capacitor arrangement shows there are no bleeder resistors. There should be one across each capacitor. 220k 2 Watt works well. A resistance much lower than that will require a larger wattage. Higher resistance is okay, but takes longer to bleed down the caps. Just need to make all three of them the same resistance value.

I see a sketchy angle to the filter caps. To use a string of three caps like that the High/Low switch should be rewired to switch the AC voltage going into the rectifier bridge. This one appears to be using the transformer center tap for the Low side, and switching DC to select High or Low side. That would tend to put too much DC voltage on the filter cap that has the negative side grounded.

But that's why we recommend rewiring the High/Low switch to the AC side of the high voltage before using the 3-capacitor kit we sell for Maco amplifiers.

73

<blockquote data-quote="nomadradio" data-source="post: 605719" data-attributes="member: 22">Taking a look at the filter capacitor arrangement shows there are no bleeder resistors. There should be one across each capacitor. 220k 2 Watt works well. A resistance much lower than that will require a larger wattage. Higher resistance is okay, but takes longer to bleed down the caps. Just need to make all three of them the same resistance value. I see a sketchy angle to the filter caps. To use a string of three caps like that the High/Low switch should be rewired to switch the AC voltage going into the rectifier bridge. This one appears to be using the transformer center tap for the Low side, and switching DC to select High or Low side. That would tend to put too much DC voltage on the filter cap that has the negative side grounded. But that&#039;s why we recommend rewiring the High/Low switch to the AC side of the high voltage&nbsp; before using the 3-capacitor kit we sell for Maco amplifiers. 73</blockquote>

[QUOTE="nomadradio, post: 605719, member: 22"] Taking a look at the filter capacitor arrangement shows there are no bleeder resistors. There should be one across each capacitor. 220k 2 Watt works well. A resistance much lower than that will require a larger wattage. Higher resistance is okay, but takes longer to bleed down the caps. Just need to make all three of them the same resistance value. I see a sketchy angle to the filter caps. To use a string of three caps like that the High/Low switch should be rewired to switch the AC voltage going into the rectifier bridge. This one appears to be using the transformer center tap for the Low side, and switching DC to select High or Low side. That would tend to put too much DC voltage on the filter cap that has the negative side grounded. But that's why we recommend rewiring the High/Low switch to the AC side of the high voltage before using the 3-capacitor kit we sell for Maco amplifiers. 73 [/QUOTE]

Top Bottom