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  #21  
Old 31st July 2011, 09:38 AM
ssaliba ssaliba is offline
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Default Choice of Tubes for Kel84

I have been shopping around for valves and noticed something about the KEL84 design. In the Kel84's voltage spec document is states that the anode voltage on the Power tubes should be around 309V. All tube datasheets (JJ,Svetlana,Mullard etc) rate their tubes with a maximum limiting anode voltage of 300V. Am I right then in concluding that the KEL84 is overdriving these valves and hence shortenting their liftime ?

If so, will this valve ( http://thetubestore.com/preferred7189.html ) solve the issue given that is has higher ratings then the std el84 ? What about its sound qualities ? Do you know of anyone who has tried this tube ?
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  #22  
Old 31st July 2011, 09:51 AM
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pre65 pre65 is offline
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Default Re: WAD Kel84 Glowing EL84

The "anode " rating is the voltage across the valve. So deduct the cathode voltage from the anode voltage to get the actual anode volts.
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Everything in this post is my honest opinion based on what i thought I knew at that very moment in time.
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  #23  
Old 31st July 2011, 10:46 AM
alnewall alnewall is offline
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Default Re: Choice of Tubes for Kel84

Quote:
Originally Posted by ssaliba View Post

If so, will this valve ( http://thetubestore.com/preferred7189.html ) solve the issue given that is has higher ratings then the std el84 ? What about its sound qualities ? Do you know of anyone who has tried this tube ?
Save some money by getting some 6p14p-ev tubes from a Russian seller. I can't tell you how they compare with all the other brands, but Russian tubes are becoming popular and the prices are going up.
I use them and like them.
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  #24  
Old 31st July 2011, 12:06 PM
ssaliba ssaliba is offline
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Default Re: WAD Kel84 Glowing EL84

Hi Philip


Thanks for your post about the anode voltage. The cathode voltage is 11v on the Kel84 right ? So in this case the actual anode volts is 298V, which is within spec but nearly to the limit. Am I correct in my conclusion ?
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  #25  
Old 31st July 2011, 12:08 PM
ssaliba ssaliba is offline
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Default Re: WAD Kel84 Glowing EL84

Thanks for your feedback Al.

I will have a look at this valve. Is it a straight replacment for my JJ EL84 or do I have to change some components to use this valve ?
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  #26  
Old 31st July 2011, 01:55 PM
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Ali Tait Ali Tait is offline
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Default Re: WAD Kel84 Glowing EL84

No, it will slot straight in. As Al says, they are very good.
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  #27  
Old 31st July 2011, 03:27 PM
Richard Richard is offline
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Default Re: WAD Kel84 Glowing EL84

I've used this seller twice and he's been good, 2 weeks from Moscow, this sale looks like for 1 pair. I ordered 20 6n2p and the postage automatically corrected to lower than single rate, but even at that posatge they look good. (EV is printed EB in Russian for some reason btw)

http://www.ebay.co.uk/itm/Matched-du...item1e64f4ddca
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  #28  
Old 31st July 2011, 06:02 PM
John Caswell John Caswell is offline
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Default Re: WAD Kel84 Glowing EL84

Hi all,
Richard wrote "EV is printed EB in Russian for some reason btw"

Cos it's the Cyrillic alphabet. q.v.

John
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  #29  
Old 31st July 2011, 08:23 PM
ssaliba ssaliba is offline
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Default Re: WAD Kel84 Glowing EL84

I just placed an order for the Russian 6P14P-EV. Looking forward to test them out Thanks for the help guys.
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  #30  
Old 31st July 2011, 08:55 PM
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Ali Tait Ali Tait is offline
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Default Re: WAD Kel84 Glowing EL84

If you want to try other valves in the future, I recommend these, they are very good indeed IMHO-

http://www.hotroxuk.com/el84-n709-ge...n-14040-0.html
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