Ebay 10 pounders with tubelab pcb's

nightanole · 14th October 2010, 07:45 PM

I have 1 extra ebay 10 pounder power transformer. I believe it does 300vdc and 330vdc unloaded. Is that enough for a standard ul simple PP el84? If i do a simpleSe with el34's in ul what power would i get out? 300 seems a bit low for for a SE build...

Just trying to find something to make out of my 10 pounder and my left over el84's and el34's.

chrisb · 14th October 2010, 09:12 PM

Quote:

Originally Posted by nightanole

I have 1 extra ebay 10 pounder power transformer. I believe it does 300vdc and 330vdc unloaded. Is that enough for a standard ul simple PP el84? If i do a simpleSe with el34's in ul what power would i get out? 300 seems a bit low for for a SE build...

Just trying to find something to make out of my 10 pounder and my left over el84's and el34's.

any idea of the current ratings for HV and filament supplies?

nightanole · 09:39 PM

well with a 35c rise above ambient he was getting 200ma and 6 amps on the filaments. id say thats a pretty good judgement considering ambient of 25-30c.

You figure 45ma a tube tops for a stereo el84 pp setup. for a el34 SE at 300v your looking at 75ma per tube.

Ty_Bower · 11:36 PM

You've got me thinking... I have one of each type of the ten pounders (#7018 and #7019). I wonder if somehow I could cobble one onto my Simple SE and get a ~300 volt B+ suitable for running my old coke bottle 6L6? But alas, the ten pounders lack a center tap. How to make this work?

I suppose I could take the #7019 (235VDC) and use an off-board full wave solid state bridge rectifier. Feed the rectified DC into T1-RED and T1-RED-YEL. Build an octal shorting plug to stick in the rectifier socket, or jumper SW1 and D1/D2. Hmm...

nightanole · 15th October 2010, 12:14 AM

ya dont need a center tap since there is only one rec in the circuit. However you need to do a full bridge. Which means 4 real diodes just like ,ahem, modern electronics.

I thought the only diff between the 7018 and the 7019 was one wire was pink and one wire was red.

nightanole · 15th October 2010, 11:05 AM

Ah crap, the 7018 is the 220vdc loaded 265ma ones, and the 7019 is the 300 200ma ones. Then again he stats its ma with the voltage doubler. So maybe these are 220 at 530ma and 300 at 400ma?

14th October 2010, 07:45 PM	#1
nightanole diyAudio Member Join Date: Feb 2009	Ebay 10 pounders with tubelab pcb's I have 1 extra ebay 10 pounder power transformer. I believe it does 300vdc and 330vdc unloaded. Is that enough for a standard ul simple PP el84? If i do a simpleSe with el34's in ul what power would i get out? 300 seems a bit low for for a SE build... Just trying to find something to make out of my 10 pounder and my left over el84's and el34's.

14th October 2010, 09:34 PM	#3
nightanole diyAudio Member Join Date: Feb 2009	well with a 35c rise above ambient he was getting 200ma and 6 amps on the filaments. id say thats a pretty good judgement considering ambient of 25-30c. You figure 45ma a tube tops for a stereo el84 pp setup. for a el34 SE at 300v your looking at 75ma per tube. Last edited by nightanole; 14th October 2010 at 09:39 PM.

14th October 2010, 11:28 PM	#4
Ty_Bower diyAudio Member Join Date: Mar 2007 Location: Newark, DE	You've got me thinking... I have one of each type of the ten pounders (#7018 and #7019). I wonder if somehow I could cobble one onto my Simple SE and get a ~300 volt B+ suitable for running my old coke bottle 6L6? But alas, the ten pounders lack a center tap. How to make this work? I suppose I could take the #7019 (235VDC) and use an off-board full wave solid state bridge rectifier. Feed the rectified DC into T1-RED and T1-RED-YEL. Build an octal shorting plug to stick in the rectifier socket, or jumper SW1 and D1/D2. Hmm... Last edited by Ty_Bower; 14th October 2010 at 11:36 PM.

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15th October 2010, 12:14 AM	#5
nightanole diyAudio Member Join Date: Feb 2009	ya dont need a center tap since there is only one rec in the circuit. However you need to do a full bridge. Which means 4 real diodes just like ,ahem, modern electronics. I thought the only diff between the 7018 and the 7019 was one wire was pink and one wire was red.

15th October 2010, 11:05 AM	#6
nightanole diyAudio Member Join Date: Feb 2009	Ah crap, the 7018 is the 220vdc loaded 265ma ones, and the 7019 is the 300 200ma ones. Then again he stats its ma with the voltage doubler. So maybe these are 220 at 530ma and 300 at 400ma?

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