EF184/6EJ7 in Vox AC15 circuit. Who needs EF86? - diyAudio
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Old 30th December 2009, 11:42 PM   #1
Cassiel is offline Cassiel  Libya
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Default EF184/6EJ7 in Vox AC15 circuit. Who needs EF86?

Since EF86 are expensive and it's not easy getting a good one i tried the EF184.

http://www.blueguitar.org/new/schem/vox/ac34ef86.pdf

EF184 in this schematic behaves like this:

P=98 volts
S=36 volts
K= 1.9 volts

Gain around 120.
Thick and creamy distortion. Wonderful, my tele sounds like a Les Paul.
Pics are crappy sorry but my digital cam just died.
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Old 31st December 2009, 01:31 AM   #2
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Indeed!

They are one gorgeous sounding tube.

I used one for a metal practise amp. Customer likes them now too
http://www.ckamps.com/ToneGeeks/Tone....msg177#msg177

Cheers!
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Old 24th August 2011, 10:09 PM   #3
emosms is offline emosms  Bulgaria
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Quote:
Originally Posted by Cassiel View Post

EF184 in this schematic behaves like this:

P=98 volts
S=36 volts
K= 1.9 volts

Gain around 120.
Thick and creamy distortion. Wonderful, my tele sounds like a Les Paul.
What are these P, S, K?
Did you adjust the schematics?
Best Regards
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Old 24th August 2011, 10:14 PM   #4
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Quote:
Originally Posted by emosms View Post
What are these P, S, K?
Did you adjust the schematics?
Best Regards
He's saying he built with EF184 in that schematic without changes (other than pinout) and he is reporting the voltages he measured on Plate, Screen, and Kathode.
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Old 24th August 2011, 10:52 PM   #5
emosms is offline emosms  Bulgaria
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I thought it is called Anode and Cathode (the others)

I would like to hear a demo of it, hope the author will see it.
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Old 24th August 2011, 11:18 PM   #6
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Anton at GSTUBE are plenty of EF86 tubes at 10 euros each.
''GSTube.com''. Tubes, sockets etc. Search result for <u>ef86</u>
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Old 25th August 2011, 12:01 AM   #7
emosms is offline emosms  Bulgaria
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i am bying tubes for 1,2 eu a piece , a rule of thumb
а local seller has one (good old used) for 1.50 eu,
but since I want at least two I don't want to pay the shipping, around 4 eu
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Old 25th August 2011, 12:11 AM   #8
Cassiel is offline Cassiel  Libya
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Quote:
I would like to hear a demo of it, hope the author will see it.
Hi, I think you can find demos with this tube substituting the ef86 (I did find them but don't have the links right now).There are also bad EF184's (noisy and microphonic) but it is much cheaper to find a good one. Modern EF86's don't sound good (IMO). Good luck.
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Old 25th August 2011, 12:35 AM   #9
emosms is offline emosms  Bulgaria
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typing ef184 in youtube and I get nothing
I cannot find any "modern" tubes overhere, (and I dont want to) a lot of russian NOS, some good old tungsram, e.t.c.
but, ef86 and the russian 6j32p - not that easy to find.
I am building a vox ac15 pentode chanel replica, 6n2p and 6p14p instead of ecc83 and el84.

Anyway, do you get the sparkle of the ef86 chanel?
It has awesome highs.
I put up smth with ef85 these days, but it sounds just mild, no strings sparkle, not the same highs

Last edited by emosms; 25th August 2011 at 12:42 AM.
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Old 25th August 2011, 01:06 AM   #10
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Forget about ef86 and 6j32p, they are greatly overpriced.

6j51p and 6j4p are much cheaper, and they indeed sound great.
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