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Old 26th January 2013, 12:35 AM   #1
surfstu is offline surfstu  United Kingdom
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Default PSU id and help (psu designer ii)

I have a transformer from an old heathkit s99, I presume it is approx 200ma but I'm not sure. I've attached a schematic for the circuit it came from. It was powering 4ecl86 and 3 ecc83's and 2 ef86's.

I have no idea of what values to enter into duncans psu designer, is the RMS V = 270 x 1.414 = 381V - and then how do I calculate the source resistance?

Is there a way to calculate more info from this transformer seeing as on the full scematic

HT 1 = 320V
HT 2 = 270V
HT 3 = 250V

cheers Stuart
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Old 26th January 2013, 04:17 AM   #2
DUG is offline DUG  Canada
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"I have no idea of what values to enter into duncans psu designer, is the RMS V = 270 x 1.414 = 381V - and then how do I calculate the source resistance?"

look at the data sheet for V10: GZ34

http://www.wooaudio.com/docs/tube_data/5AR4.pdf

Hope that helps.
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Old 26th January 2013, 01:48 PM   #3
DF96 is offline DF96  England
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RMS voltage is 270V. Peak will be 381V. I believe PSUD2 uses RMS, so enter 270V. For source resistance measure primary and secondary resistance with a DVM, and then enter the results into the PSUD2 transformer calculator (or do the calculation yourself).
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Old 26th January 2013, 02:18 PM   #4
surfstu is offline surfstu  United Kingdom
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Thanks Df96, I didn't realise I could just stick a DVM on primary winding (mains side?) and then over the secondary winding (leave CT out?) to get resistances - that I could then apply to a formula to find the source resistance!

If I then setup a circuit in PSUD2, using full wave rectifier (GZ34) followed by CRCRC will I be able to identify the current throught the circuit by seeing what flows through the final 5K resistor that PSUD2 puts in by default?

Or do I change that final 'resistor to ground' to a resistance that matchs the perceived resistance of the amp I wish to build?

If I wish to build the original Baby Huey amp that gingertubes modded for UL operation, should I be changing the value of the final 5k resistor of PSUD2?

Thanks again for everyones help here, and thanks Dug for the data sheet
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Old 26th January 2013, 02:35 PM   #5
DF96 is offline DF96  England
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I'm not sure about the CT, as I can't remember what PSUD2 assumes for secondary resistance.

You can use either a resistor or constant current load for your PSU. A resistor may better approximate the load of a real valve amplifier. Set it to whatever value is appropriate.
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Old 26th January 2013, 02:40 PM   #6
surfstu is offline surfstu  United Kingdom
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Thanks DF, but how do I know what value is appropriate for the final R in PSUD2

and... I just read somewhere that the primary resistance is taken across the mains, and the secondary is HALF the secondary... I'm guessing this means CT to one side of the secondary?
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Old 26th January 2013, 02:46 PM   #7
surfstu is offline surfstu  United Kingdom
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If this is the circuit I intend to build then is there a way of approximating the final R value?
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Old 26th January 2013, 02:48 PM   #8
surfstu is offline surfstu  United Kingdom
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better image!
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Old 26th January 2013, 06:38 PM   #9
DF96 is offline DF96  England
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Find the current, then use Ohm's Law.
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Old 27th January 2013, 04:52 PM   #10
surfstu is offline surfstu  United Kingdom
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Would it be safe to say that the current drawn by this circuit (4 x ecl86) will be 4 x 35mA which is 140mA?
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