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I asked Brian at edcor "What's the highest voltage a CXSE25-8-5K can take? " He said "Remember that P=E2/R. The would give the highest voltage you should be putting in at 25W. But the coil has a brake down voltage of over 800V."

I keep seeing people use $1000 Tangos, even Pete Millet uses a Tango on his 813. I know Edcor's work, because Geek uses one, should I get a CXSE24-8-10K or his custom made EM0074-CXSE? What's the difference, other than 1K.

(I'm working on two projects while waiting on parts to come in, 811A and right now I'm leaning toward 813 because I can't find any 838s )

Hope you have a good amount of money! here they are!! 838's

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Tube Type
NOS ----- Used

838 99.00 65.00

I found 5 places that have them, but 2 didn't have any in stock (the 2 cheapest), I emailed 2 more and am waiting, and the $100 838. Ebay only has 1 for display, that got me worried. Chinese 211s are cheap, but I've only seen one review and it wasn't good.

Hi DeathRex,
This could be your answer, a 203A Substitute I found in Auction on Ebay at $13.50 Pair; in bidding right now!
Location of Item is in Austin, Texas so you know it has to be good!
RCA 203A Tubes UV-203A (General Electric Western 211 845 811)

Thems are some pretty bottles.

I did not bid on these, these are for you! so, go ahead and bid before the 3-days that are left expires and someone else wins the auction!

The OPT's can handle the B+, they just had no intentions of making the power transformer again (RMS vs. Peak and all).

http://edcorusa.com/boards/topic/241/mi ... m-the-list

Cheers!

DeathRex wrote:I asked Brian at edcor "What's the highest voltage a CXSE25-8-5K can take? " He said "Remember that P=E2/R. The would give the highest voltage you should be putting in at 25W. But the coil has a brake down voltage of over 800V."

I keep seeing people use $1000 Tangos, even Pete Millet uses a Tango on his 813. I know Edcor's work, because Geek uses one, should I get a CXSE24-8-10K or his custom made EM0074-CXSE? What's the difference, other than 1K.

(I'm working on two projects while waiting on parts to come in, 811A and right now I'm leaning toward 813 because I can't find any 838s )

For an 813, a 5K primary impedance is as low as you want to go. Millet's Tango is 5k, however.

My pick for the 813 is a CXSE25-8-6_5.

http://www.edcorusa.com/p/479/cxse25-8-6_5k

Millet used the two windings of a (175Vac) 225VA Piltron toroid in series for his doubler. 1 per channel. He claimed to get ~1000VDC. But, his B+ after filtering, dropping and loading was 800Vdc.

Antek sells a 320V 400VA toroid, which - with the windings in parallel - should be good for a stereo 813. Not as much dropping needed to get to 800Vdc with the Antek, than the Piltron.

http://www.antekinc.com/details.php?p=710