6P14P Amp Scratch Build - Page 3

mitwrong · 25th December 2006, 03:26 AM

Quote:

Originally posted by motherone
as I found an ebayer selling 6P14P (Sovtek EL84s?) and picked up 40 of them at $2/each. eBay is definitely the place to get them, as the web shops are selling them for $7+ each!

Guys:

I want to repeat : 6p14 is made in China, and 6pie14pie, is made in Russian, on my keyboard, it doesn't has a " pie " symbol.

At Ebay only $2/each, Don't you think that is OK?????

I have bought tubes from Ebay, very cheap! But only 10% can work. the rest all went to junk yard!!!! Imagine how can a working tube sell at $2 of EL84???? Only an AB resistor cost???
Those tubes are selected ones, worse ones!!!! Don't try to pick up a penny without sweat ed!!!!

Good Luck! and have fortune!

sorenj07 · 25th December 2006, 04:33 AM

I don't see what the debate is here...

anyway, merry christmas, all!

p.s. i tried a quad of my RUSSIAN 6p14p's and they were all very close to each other, and sound great. i had no problems changing my 20-ohm pots to match them to .1mA of each other. ymmv.

motherone · 25th December 2006, 04:39 AM

My understanding of translating the "Pi" symbol is that it's indicated as 6N14N or 6P14P. While 6P14 may be the Chinese designation, folks chose the 6P14P as many do not have a way of putting in cyrillic characters.

As far as the tubes go, the ones I picked up came in a box marked Sovtek EL84, and the tubes look absolutely pristine. I've no way to tell if they're bad, but the seller sold them at a loss (I had a lengthy discussion with him regarding them).

I'm not particularly worried about it. Even if half of them are okay, it's still a good deal.

Eventually I hope to pick up a tube tester and match them up.

Also, there are sellers from eastern europe offering them up pretty inexpensively on there, for un-branded EL84 (6P14P), usually at $2-4/tube, depending on the quantity.

rdf · 25th December 2006, 05:16 AM

Same here, bought 16 of the Russian EL84M equivs and haven't seen a dud yet. They all measure as close as any other brand. EH on the other hand have been junk in my experience, so no-name doesn't always indicate no quality.

jon_010101 · 25th December 2006, 06:39 AM

Quote:

Originally posted by motherone
My understanding of translating the "Pi" symbol is that it's indicated as 6N14N or 6P14P. While 6P14 may be the Chinese designation, folks chose the 6P14P as many do not have a way of putting in cyrillic characters.

Cyrllic "H" -> "N"
Cyrllic "Pi" -> "P"

I suspect the only reason they indicate it on eBay as lower case "n" is because it is the closest shaped character to a Pi. Using P is a totally valid translation, just as we say 6N1P rather than 6H1Pi

Searching for 6P14P on eBay yields Russian tubes, 6P14 yields Chinese tubes.

motherone · 25th December 2006, 10:39 AM

The only experience I have so far with EH is their 12AU7 for a SOHA amplifier. It's by far the quietest I've tested so far. The Chinese 12AU7 is extraordinarily noisy. I've tried some vintage ones as well, but I have about 15 brands to try out and haven't gotten to all of them yet

Hopefully the ones I bought weren't duds. They seriously look flawless, so unless the guy I purchased from was shipped ones that weren't to spec (which I doubt), they should be fine!

All I have to say is that you've got to love eBay!

sorenj07 · 25th December 2006, 03:28 PM

Quote:

Originally posted by sorenj07
Well, I'm drawing around 192mA of current through the 6V3-A's and they seem to be holding pretty steady, but it's still kind of disturbing. The amp has worked so far, I rarely listen very loudly. Is it worth replacing each 6V3-A with a paralleled 6CA4 (which I can definitely do) or should I not sweat it?

note: datasheets I've seen for the 6V3-A specify 600-800mA steady peak current and 135mA DC current...

anyway, back to topic... any ideas?

Zibi · 25th December 2006, 05:02 PM

Off-topic but useful: russian tubes numbering system
http://www.jogis-roehrenbude.de/Russ...he_Roehren.htm

Menator · 26th December 2006, 07:53 PM

The tube 6P14P(EV) is made in USSR. It's russian. Most of this tube are made in Svetlana factory in Leningrad. I have many. It is the russian version of EL84 tube. The military version are "EV". The other are only 6P14P.

Zibi · 28th December 2006, 03:53 PM

Quote:

Originally posted by sorenj07
Well, I'm drawing around 192mA of current through the 6V3-A's and they seem to be holding pretty steady, but it's still kind of disturbing. The amp has worked so far, I rarely listen very loudly. Is it worth replacing each 6V3-A with a paralleled 6CA4 (which I can definitely do) or should I not sweat it?

note: datasheets I've seen for the 6V3-A specify 600-800mA steady peak current and 135mA DC current...

anyway, back to topic... any ideas?

Don't change anything.

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25th December 2006, 04:33 AM	#22
sorenj07 diyAudio Member Join Date: May 2006	I don't see what the debate is here... anyway, merry christmas, all! p.s. i tried a quad of my RUSSIAN 6p14p's and they were all very close to each other, and sound great. i had no problems changing my 20-ohm pots to match them to .1mA of each other. ymmv.

25th December 2006, 04:39 AM	#23
motherone diyAudio Member Join Date: Apr 2003 Location: Seattle	My understanding of translating the "Pi" symbol is that it's indicated as 6N14N or 6P14P. While 6P14 may be the Chinese designation, folks chose the 6P14P as many do not have a way of putting in cyrillic characters. As far as the tubes go, the ones I picked up came in a box marked Sovtek EL84, and the tubes look absolutely pristine. I've no way to tell if they're bad, but the seller sold them at a loss (I had a lengthy discussion with him regarding them). I'm not particularly worried about it. Even if half of them are okay, it's still a good deal. Eventually I hope to pick up a tube tester and match them up. Also, there are sellers from eastern europe offering them up pretty inexpensively on there, for un-branded EL84 (6P14P), usually at $2-4/tube, depending on the quantity.

25th December 2006, 05:16 AM	#24
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	Same here, bought 16 of the Russian EL84M equivs and haven't seen a dud yet. They all measure as close as any other brand. EH on the other hand have been junk in my experience, so no-name doesn't always indicate no quality.

25th December 2006, 10:39 AM	#26
motherone diyAudio Member Join Date: Apr 2003 Location: Seattle	The only experience I have so far with EH is their 12AU7 for a SOHA amplifier. It's by far the quietest I've tested so far. The Chinese 12AU7 is extraordinarily noisy. I've tried some vintage ones as well, but I have about 15 brands to try out and haven't gotten to all of them yet Hopefully the ones I bought weren't duds. They seriously look flawless, so unless the guy I purchased from was shipped ones that weren't to spec (which I doubt), they should be fine! All I have to say is that you've got to love eBay!

25th December 2006, 05:02 PM	#28
Zibi diyAudio Member Join Date: Jan 2006 Location: Bialystok	Off-topic but useful: russian tubes numbering system http://www.jogis-roehrenbude.de/Russ...he_Roehren.htm

26th December 2006, 07:53 PM	#29
Menator diyAudio Member Join Date: Dec 2006	The tube 6P14P(EV) is made in USSR. It's russian. Most of this tube are made in Svetlana factory in Leningrad. I have many. It is the russian version of EL84 tube. The military version are "EV". The other are only 6P14P.