L'Amp: A simple SIT Amp - Page 11

OlavHaal · 23rd December 2011, 04:50 PM

Hi all!

Just to have a note before the holiday: my old schoolteaching tells me - if you have a halogen bulb with 24 volt and 100 watt = 24x24=576 divided on 100 = 5,76 ohm!! Then you have 3 in seriell= 17,28 with 300 watt. If you then keep 3 more in paralell to those first 3 you end up with 600 watt AND 8,64 ohm. That is pretty close - and if you give 1 resistor in seriell with those bulbs - you get even closer. I have found som small bulbs(halogen 100 watt, 24 volt) here in Norway.

My SK82(KD33) was ordered 1 week ago. so the build will start in feb/mars!

Happy New Year

Greetings to all

Olav

Franz Gysi · 23rd December 2011, 04:53 PM

Olav

I was talking about 300W/120V bulbs, not 24V.

O.K. maybe a way to go.

Thanks for all answers up to now.

Franz

OlavHaal · 23rd December 2011, 05:01 PM

Yeah - I know that it would be a closer fit with 300watt and 120 volt, but it is somewhat difficult to get hold on 120 volts bulbs here in Norway - and with 230 volt and low wattage bulbs it is even vorse(like 230 watt and 20 or 10 watt)!

That is why I am thinking to try my amp with those 24/100 watt bulbs? Maybe?

Best to all.

Olav

juanitox · 23rd December 2011, 05:06 PM

don't you think this kind of filament could be inductive?!

Tea-Bag · 23rd December 2011, 05:07 PM

Quote:

Originally Posted by juanitox

with this one you don't have heatsink but 72W watt of dissipation on a 300W resistor could be ok?

Looks like a cigar

Quote:

Originally Posted by ra7

woodturner-fran was it, who used halogen sticks in the Delite amp? Check the Delite thread.

Yep.

juanitox · 23rd December 2011, 05:32 PM

Quote:

Originally Posted by juanitox

don't you think this kind of filament could be inductive?!

oops 75h of life...

triode_al · 23rd December 2011, 05:55 PM

Quote:

Originally Posted by Michael Rothacher

Is 15,000 views enough to crack open the Christmas Ale?

Should have an Aladdin L'Amp for Christmas

OlavHaal · 23rd December 2011, 06:15 PM

Hi again!

Here is my finding: From the ELFA catalog: 4000 HOURS!!!

: https://www.elfaelektronikk.no/elfa3...4-48&toc=19002

A search gave me this result - maybe it can be that i nyour country too??

Good luck - and the best to you.

Olav

Michael Rothacher · 27th December 2011, 12:08 PM

Out of sheer morbid curiosity, I tested a large source resistor bypass cap (47,000 uF) and the results were not especially good. 1W THD climbs from .07% to around .5%.

juanitox · 27th December 2011, 05:19 PM

0.5% not so bad for me ..

and the sound?? i must be sure that i will kill my SET amp

23rd December 2011, 04:50 PM	#101
OlavHaal diyAudio Member Join Date: Oct 2010 Location: Haugesund	Hi in these pre-christmas time! Hi all! Just to have a note before the holiday: my old schoolteaching tells me - if you have a halogen bulb with 24 volt and 100 watt = 24x24=576 divided on 100 = 5,76 ohm!! Then you have 3 in seriell= 17,28 with 300 watt. If you then keep 3 more in paralell to those first 3 you end up with 600 watt AND 8,64 ohm. That is pretty close - and if you give 1 resistor in seriell with those bulbs - you get even closer. I have found som small bulbs(halogen 100 watt, 24 volt) here in Norway. My SK82(KD33) was ordered 1 week ago. so the build will start in feb/mars! Happy New Year Greetings to all Olav

23rd December 2011, 05:01 PM	#103
OlavHaal diyAudio Member Join Date: Oct 2010 Location: Haugesund	Hi Franz Yeah - I know that it would be a closer fit with 300watt and 120 volt, but it is somewhat difficult to get hold on 120 volts bulbs here in Norway - and with 230 volt and low wattage bulbs it is even vorse(like 230 watt and 20 or 10 watt)! That is why I am thinking to try my amp with those 24/100 watt bulbs? Maybe? Best to all. Olav

23rd December 2011, 05:06 PM	#104
juanitox diyAudio Member Join Date: Dec 2006	don't you think this kind of filament could be inductive?! __________________ French is not a crime.

23rd December 2011, 06:15 PM	#108
OlavHaal diyAudio Member Join Date: Oct 2010 Location: Haugesund	so litlle .... Hi again! Here is my finding: From the ELFA catalog: 4000 HOURS!!! : https://www.elfaelektronikk.no/elfa3...4-48&toc=19002 A search gave me this result - maybe it can be that i nyour country too?? Good luck - and the best to you. Olav

27th December 2011, 12:08 PM	#109
Michael Rothacher www.audiohobby.com diyAudio Member Join Date: May 2001 Blog Entries: 3	Out of sheer morbid curiosity, I tested a large source resistor bypass cap (47,000 uF) and the results were not especially good. 1W THD climbs from .07% to around .5%. __________________ My Website, Projects, Sale Items


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23rd December 2011, 04:53 PM	#102
Franz Gysi diyAudio Member Join Date: Oct 2007	Olav I was talking about 300W/120V bulbs, not 24V. O.K. maybe a way to go. Thanks for all answers up to now. Franz

27th December 2011, 05:19 PM	#110
juanitox diyAudio Member Join Date: Dec 2006	0.5% not so bad for me .. and the sound?? i must be sure that i will kill my SET amp __________________ French is not a crime.

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