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CCE Mod on a triode connected EF86 (Read 1907 times)
fabian
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CCE Mod on a triode connected EF86
07/24/11 at 03:13:21
 
Hi,
I am planning on building an ef86 + el84/sv83 tube amp. The ouput socked will be wired with the CCE mod. However, being the ef86 a pentode and not being g3 and k internally connected  I was wondering if :
1- Is it possible to apply the cce mod to a triode strapped ef86
2- If so, which would be the value for the cap. would 0.1uF as with the sv83 be just fine ?

Thanks.
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veryoldcat
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Re: CCE Mod on a triode connected EF86
Reply #1 - 07/24/11 at 04:04:36
 
Hi Fabian,

I posted a very similar question last year (don't remember if it was here, but I think so), but with no answer.

Let's hope for some interest, as I've also been wondering the same thing.

Cheers,
Karl
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SE84CS (vcapped), CSP, zbox, Dec685, ZP 1.0, Sota tt/Well-Tempered Arm/V15XMR, Parker 98's, Parker Audio *Power Chords*, cat 6 wires, OSX; a garage sale of other stuff...
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fabian
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Re: CCE Mod on a triode connected EF86
Reply #2 - 07/24/11 at 20:44:23
 
Yep, I saw your post. Before asking I searched the forum to see if the answer was already here but as you said, noone answered Sad

I would try myself and see if it works but the problem is that Im in Argentina and I want Mundorfs for my amp. The problem is that there is only one Mundorf reseller in Argentina and every time I make a request it cant be just a couple of caps and I have to wait like forever for them to get here. Besides, costing them aroun 38 euro each, I just cant afford getting them to see "what happens" and I cant use another cap and if it works then ask for the Mundorfs because I cannot make a just two caps request Sad

Anybody can help ? There is two of us now. Please :-D
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dank
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Re: CCE Mod on a triode connected EF86
Reply #3 - 07/24/11 at 23:40:23
 
Fabian, Veryoldcat

Sure. The Zen and Zkit1 are pentodes running in triode mode that use the CCE mod, and the Taboo is a pentode running in pentode mode that uses the CCE mod too. I've never seen anything other than 0.1uf 400v suggested.


Dan
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fabian
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Re: CCE Mod on a triode connected EF86
Reply #4 - 07/25/11 at 02:59:04
 
Hi there,

Thanks for your answer, however what Id like to know is if the mod can be implemented in an ef86. Im planing to build an ef86/el84 amp and being the ef86 a pentode I wanted to try the CCE mod in the ef86 tube. I've seen the CCE Mod on sv83, el34, etc all are output tubes but Im not sure if it can be implemented in an input signal tube like the ef86 :-D

Thanks.
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« Last Edit: 07/25/11 at 02:59:49 by fabian »  
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dank
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pair of dual 18
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Re: CCE Mod on a triode connected EF86
Reply #5 - 07/25/11 at 13:25:05
 
As long as you have a pentode with g3 not internally tied to the cathode, the CCE mod should work. I believe the thoughts are that the CCE mod does something with secondary emission electrons that bounce off the plate, keeping them from being re-attracted to the plate and smearing the image. I would think that this secondary emission would be greatly reduced for an input/amplifier stage as opposed to the output stage due to the larger current flow in the output stage. However, the effect might be amplified if it is at an earlier point, so give it a try.

I would suggest getting a couple inexpensive .1 uf 400v polypropylene capacitors and trying it out.  If it appears to do something good you can always upgrade to your expensive Mundorfs later.

Dan
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fabian
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Re: CCE Mod on a triode connected EF86
Reply #6 - 07/25/11 at 23:04:01
 
Hi there, thank you very much for your help. Ill do that. Once I get the rest of the materials I need for my amp (power trans, chokes, etc etc etc) Ill implement the mod on the ef86 and will come back with the results.
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« Last Edit: 07/25/11 at 23:06:20 by fabian »  
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