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#21 |
diyAudio Member
Join Date: Mar 2007
Location: Melbourne, Victoria
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You could at least answer the questions you were asked here.
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#22 |
diyAudio Member
Join Date: May 2013
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EJP...Thats exactly what i was wondering about. Do the last two capacitors EACH cop 505 volts ? From what you said i should measure voltage at start up on each cap individually to know the answer .
The last two caps in my circuit are 450volt rated. As to the Cathode biased idea i believe the 6cm5's can handle a lot more than 10 watts diss. Some say they wont red plate till about 25 watts diss. I don't know what maximum plate voltage they can handle. So what cathode current and plate voltage in a cathode biased situation to aim for i simply dont know. |
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#23 |
diyAudio Member
Join Date: Mar 2007
Location: Melbourne, Victoria
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That's exactly what *we* were wondering about. I asked a clear question. Only you can answer it. I don't know what exactly you mean by 'last two capacitors' or even '505 volts' at the moment, as you haven't stated where it was measured or what it was referenced to, or whether you are including the capacitors for HT2/3, but none of the capacitors in the schematic has the full HT1 rail voltage across it.
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#24 |
diyAudio Member
Join Date: May 2013
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Sorry EJP i thought my question was clear enough. By the last two capacitors i meant the very last two in the 6 times multiplier C3 and C6 , which on the circuit are marked as 250volt types. The ac supply is 55vac. The B+ is at The C3 + (also marked as HT1).
I was curious about the voltage rating when i saw 505 volts dc at the B+ Hence the question. |
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#25 | |
diyAudio Member
Join Date: Aug 2009
Location: College Station, TX
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Quote:
I'm still unclear why you haven't answered your original question by simply measuring the voltage across each of the final capacitors. |
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#26 |
diyAudio Member
Join Date: Mar 2007
Location: Melbourne, Victoria
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And I'm still unclear why you don't answer the questions you're asked here.
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#27 | |
diyAudio Member
Join Date: Mar 2003
Location: Haarlem, the Netherlands
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Quote:
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#28 |
diyAudio Member
Join Date: May 2013
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The circuit is the same as the Valve heaven Lamington 2 . I havent been able to post it . But it is a standard common 6 times multiplier. With 250 volt rated capacitors. This is why i was curious about the 505 volts at the B+ and (at the last two capacitors ) . Sorry i can't explain it any better than that ! I will measure the voltages at those two capacitors.
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#29 | |
diyAudio Member
Join Date: Aug 2009
Location: College Station, TX
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Quote:
But since you are saying yours is a sextupler, it would seem you must be meaning a different schematic. Last edited by cnpope; 22nd October 2019 at 12:24 PM. |
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#30 |
diyAudio Member
Join Date: May 2013
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Thank you cnpope . It is in fact a 6 times multiplier. as per the Lamington 2 . Other lamington power supplies are 4 times. With your calcualations that means 509 volts across each capacitor. And i guess thats why i saw 505 volts on the B+ at start up . The circuit has 250 volt capacitors , hence the question.
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