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-   -   Russian EL509 / 6KG6 quality question?? (http://www.diyaudio.com/forums/tubes-valves/4691-russian-el509-6kg6-quality-question.html)

cocolino 21st July 2002 02:24 AM

Russian EL509 / 6KG6 quality question??
 
Is somebody around here who has bought Russian Svetlana EL509/6KG6 tubes which are offered at ebay quite often??
Sellers are Gintaras (ebay-ID: kwtubes) in Lithuania and Tony Welsh (ebay-ID: tonywelsh) in England .
I`m considering to make a high-power OTL tube amp and therefore would need a hole bunch of them.
Before spending big money I`d like to know about the quality and reliability of this tubes and wether or rather not to buy them? :confused:
BTW: Are this tubes from current production or NOS?

As far I know there is only one other manufacturer of affordable (I don`t want and can`t spend $35/each) EL509`s today, it`s "EI" (Yugoslawia). Any inputs which (and why) to prefer - "EI" or the mentioned "Svetlana"?

Any kind of advice is highly appreciated!!
Thank You!!

Mohan Varkey 1st August 2002 09:31 PM

I do not know Gintaras. EL509 from Russia are generally good reliable tubes. I have only 2-4 tubes out of 100 fail on testing.

Mohan

cocolino 3rd August 2002 12:52 AM

Thanks Mohan!

Fine to hear about good reliability. Does You refer to current production Svetlana EL509 which is supposed to be even better quality than ever before or to NOS?
Quote:

I have only 2-4 tubes out of 100 fail on testing.
Does this mean once You had 100 of them?:eek:
I have to admit I`m somewhat curious to know what kind of gear (maybe an OTL tube amp?....or several:) ) You do/did with such an amount of EL509`s?

Is anybody out there who can tell me something about the quality of current production "EI" EL509 also?

planet10 3rd August 2002 05:22 AM

Re: Russian EL509 / 6KG6 quality question??
 
Quote:

Originally posted by cocolino
Sellers are Gintaras (ebay-ID: kwtubes) in Lithuania
I can't comment on the 509s but i can vouch for Gintaras being a stand-up eBay seller.

dave

Mohan Varkey 11th August 2002 11:26 PM

Christoph,

I specialise in electron tube applications (high power transmitting). My company Australian Electric Valve distributes electron tubes. This will explain my stock of 100+ tubes.

Audio is my hobby. So I design audio amplifiers as well.

I have been stocking Russian tubes since 1990. Tubes that I have in stock are marked in Russian. My comments refer to these. I have not purchased Svetlana branded ones yet. My comments apply to the original Russian production.

I used to have stocks of EI tubes-PL519. These are tonally very pleasing in Tim de Paraviciniís EAR amps. If you use these tubes you may need replacements every two years or so.

More dynamic than the EI tubes are the Tugsram PL519. They are also quite reliable and will last a few more years than EI tubes.

I hope that this answers most of your questions.

Mohan

dice45 11th August 2002 11:35 PM

Christoph,

have read a lot of comments about Gintaras on the JoeNet, all comments positive and seconding he is an honest busness partner and his stuff is good..

cocolino 12th August 2002 05:18 PM

Thanks a bunch Mohan - that`s exactly the information I have hoped to hear!
What You said about the "EI`s" corresponds with rumours I have hard about that they are not the best regarding durability (maybe that`s the reason why they are the cheapest among the EL/PL 509/519). This might be reason enough for me better to invest a little more in higher quality.

Dave and Bernhard:
Thanks to You too. I know Gintaras already from a former purchase (not tubes) and I also think he is very okay. But I thought it cannot harm to hear some other opinions though, unless the one from the seller (the opinion from a seller about the quality of his ware hardly is completely free of bias, even if he otherwise is very honest ;)).

Denis 10th October 2002 12:18 PM

Re: Russian EL509 / 6KG6 quality question??
 
[QUOTE]Originally posted by cocolino
[B]Is somebody around here who has bought Russian Svetlana EL509/6KG6 tubes which are offered at ebay quite often??
Sellers are Gintaras (ebay-ID: kwtubes) in Lithuania and Tony Welsh (ebay-ID: tonywelsh) in England .

These are excellent tubes!

I`m considering to make a high-power OTL tube amp and therefore would need a hole bunch of them.

You need just two pairs of them and two decent OPTs. Do not make an OTL. This is for those who not beleive the blameless transformers do exist. They exist.

Before spending big money I`d like to know about the quality and reliability of this tubes and wether or rather not to buy them? :confused:
BTW: Are this tubes from current production or NOS?

As far as I know, Svetlana EL509 are currently in production.

In good PP pentode output stage EL509 has no rivals.
The best circuit solution is cathode feedback or distributed load circuit like that of QUAD II.
What do you say about a total absence of odd harmonics at low and moderate levels just SET?


Denis.

mike galusha 14th October 2002 08:40 PM

Re: Re: Russian EL509 / 6KG6 quality question??
 
Quote:

Originally posted by Denis
In good PP pentode output stage EL509 has no rivals.

The best circuit solution is cathode feedback or distributed load circuit like that of QUAD II.
What do you say about a total absence of odd harmonics at low and moderate levels just SET?

Denis.
Denis,

I'm new here but could not help being intrigued by your statement. I recently completed a pair of PP EL509 amps and they sound pretty good. I built them per the schematic in Bruce Rozenblit's Audio Reality book. Since I have been working with these tubes recently your post caught my eye.

Do you have a design such as you mentioned above? I would love to learn more as I don't yet have the knowledge to design an amp from scratch.

Mike

Denis 18th October 2002 06:56 AM

Re: Re: Re: Russian EL509 / 6KG6 quality question??
 
Quote:

Originally posted by mike galusha


Denis,

I'm new here but could not help being intrigued by your statement. I recently completed a pair of PP EL509 amps and they sound pretty good. I built them per the schematic in Bruce Rozenblit's Audio Reality book. Since I have been working with these tubes recently your post caught my eye.

Do you have a design such as you mentioned above? I would love to learn more as I don't yet have the knowledge to design an amp from scratch.

Mike

You can find more on my designs at http://www.cortmi.com.ua/omak
Also I make the special output transformers.
I use one(OMAK J1) or two(OMAK J3) pairs of EL509 tubes in a push-pull arrangement with a cathode feedback. This means a small part of the primary winding (12.5% in my design) is connected to the cathodes of the power tubes providing a local voltage NFB. This arrangement allows one to greatly reduce the output resistance (even better than with triode connection) and get very linear operation over a wide range of loads. The screen grids are connected to a constant B+ supply, and it is esssential that Eg2 < Ep. The proper choice of Eg2 results in almost total elimination of third harmonic from the distortion spectra al low and moderate signal levels. The only significant distortion product is a residual 2H, which depends on tube matching. In this mode of operation the pentodes surpass everything including SET.
The greatest benefit of EL509 over all other power pentodes is that there is a lot of output power even at the above conditions with reduced Eg2 thanks to its enormous emission current.
I use EL509 in class A for the most of load range.
Although one PP pair of EL509s can reliably deliver up to 150W, I use them in far more conservative margins, and the distortion certainly fall below the perception limit.

Best regards.

Denis.


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