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.
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.
Attachments
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/ToneGeeks/index.php?topic=16.msg177#msg177
Cheers!
They are one gorgeous sounding tube.
I used one for a metal practise amp. Customer likes them now too
http://www.ckamps.com/ToneGeeks/ToneGeeks/index.php?topic=16.msg177#msg177
Cheers!
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.
Anton at GSTUBE are plenty of EF86 tubes at 10 euros each.
''GSTube.com''. Tubes, sockets etc. Search result for <u>ef86</u>
''GSTube.com''. Tubes, sockets etc. Search result for <u>ef86</u>
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
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:
I've just typed ef184 and Vox AC15 and this thread comes out in pole position. I can't find the demo now, the Moonlight amp has the same tube but the amp is completely different so....Yeah, plenty of highs; different sound than the ef86 though. I don't know if this tube will work in a combo amp due to the vibrations, you can try another pentode - follow Wavebourn's advice.
I can't find the demo now, the Moonlight amp has the same tube but the amp is completely different so....Yeah, plenty of highs; different sound than the ef86 though. I don't know if this tube will work in a combo amp due to the vibrations, you can try another pentode - follow Wavebourn's advice.Hey,
AC15 is a great amp, I once had the AC Ten Twin and I think it´s the same amp-circuit. Didn´t modify it though as it had the creamiest distortion I´ve found.
Have been thinking of using a high Gm tube have not gotten that far.
We also got tired of the expensive EF86. Instead we use a cascoded E88CC that is in current production. We use it in all our amps. Sounds a lot better and is noisefree. I´m not a great guitarist but you can listen to it here using the reVintage Pro. I don´t use a lot of overdrive though:
E-Flat Jump, Hot Little Mama - YouTube
AC15 is a great amp, I once had the AC Ten Twin and I think it´s the same amp-circuit. Didn´t modify it though as it had the creamiest distortion I´ve found.
Have been thinking of using a high Gm tube have not gotten that far.
We also got tired of the expensive EF86. Instead we use a cascoded E88CC that is in current production. We use it in all our amps. Sounds a lot better and is noisefree. I´m not a great guitarist but you can listen to it here using the reVintage Pro. I don´t use a lot of overdrive though:
E-Flat Jump, Hot Little Mama - YouTube
Last edited:
6n23p
e88cc? I have 6n23p
cascode mode, you mean like ax84 firefly?
Not quite the same on the demo, maybe the guitar player has "cut" the highs?
I can get a thick tone with a small pedal processor.
I need the transparent and bright almost clean sparkle tone.
Vox AC15 Heritage Handwired - YouTube
have you tried these>
6j1p
6j2p
6j23p
6j38p
6j5p
I can order these along wiht just a single piece of each ef86, 6j51p, 6j4p
but the others are more of a kind. All described as pentodes or hf pentodes, 7 pin
e88cc? I have 6n23p
cascode mode, you mean like ax84 firefly?
Not quite the same on the demo, maybe the guitar player has "cut" the highs?
I can get a thick tone with a small pedal processor.
I need the transparent and bright almost clean sparkle tone.
Vox AC15 Heritage Handwired - YouTube
have you tried these>
6j1p
6j2p
6j23p
6j38p
6j5p
I can order these along wiht just a single piece of each ef86, 6j51p, 6j4p
but the others are more of a kind. All described as pentodes or hf pentodes, 7 pin
Last edited:
6N23 E88CC, what should be the big difference? About the amateurish Firefly using AX7 and AU7, it´s not like that.
It´s our patentable TULP cicuit allowing us to go gradually from triode- to -pentode(=cascode) characteristics. It can be done with any pentode.
At the Vibro faceplate you can see the TULP-knob all to the left. The scale(?) goes from 1 to 11 and I think the one in the video was with 8 against pentode(11).
http://webc.revintage.se - http://webc.revintage.se - http://webc.revintage.se - http://webc.revintage.se - http://webc.revintage.se - http://webc.revintage.se - http://webc.revintage.se - http://webc.revintage.se - http://webc.revintage.se - http://
It´s a pity most of you don´t Swedish but it´s a test from Fuzz magazine at the site telling how it works IRL.
Anyway it would be very interesting to try a high-Gm pentode like EF184.
It´s our patentable TULP cicuit allowing us to go gradually from triode- to -pentode(=cascode) characteristics. It can be done with any pentode.
At the Vibro faceplate you can see the TULP-knob all to the left. The scale(?) goes from 1 to 11 and I think the one in the video was with 8 against pentode(11).
http://webc.revintage.se - http://webc.revintage.se - http://webc.revintage.se - http://webc.revintage.se - http://webc.revintage.se - http://webc.revintage.se - http://webc.revintage.se - http://webc.revintage.se - http://webc.revintage.se - http://
It´s a pity most of you don´t Swedish but it´s a test from Fuzz magazine at the site telling how it works IRL.
Anyway it would be very interesting to try a high-Gm pentode like EF184.
Cool...I've got some 6EJ7s and have been conteplating trying it instead of the 6922s I usually use. How are they in terms of microphonics?
Hey revintage, I've been using 6922/E88CC in my guitar amps as well. I like it a lot more than the 12AX7. Why use tubes where you have to dump gain? Also the 6922s can drive any tonestack even when coupled as a common cathode gain stage, no need for a CF.
Check em out here: devildogamps.com (search youtube for a clip)
Hey revintage, I've been using 6922/E88CC in my guitar amps as well. I like it a lot more than the 12AX7. Why use tubes where you have to dump gain? Also the 6922s can drive any tonestack even when coupled as a common cathode gain stage, no need for a CF.
Check em out here: devildogamps.com (search youtube for a clip)
Sorry, don´t understand how you mean. We use E88CC cascoded giving a gain of well over 50dB. And it is to substitute EF86 or other pentode. Would never use a triode as inputstage. We have a n allltogeteher different approach http://www.revintage.se
Last edited:
Well, no doubt we have different circuits, I've never heard of you and your amps before so it'd be kinda odd if we did it the same way. What I mean is we use the same tube that's all. I've used it in high gain stages as well, either cascode or with currentmirrors for gains > 30dB, and CCS or choke loaded for gains ~30dB.
Regarding dumping gain, most cascaded 12AX7 based preamps have at least one voltage divider in there at some stage, often between each stage, dumping some of that high mu tube's gain. So what I meant is instead of useing a tube with mu>80-100 and end up dumping some gain - and needing a CF to drive low-Z loads, why not just use a lower mu tube such as the 6922 and as a bonus be able to drive low-Z loads without a CF.
That's all, no offence intended.
Regarding dumping gain, most cascaded 12AX7 based preamps have at least one voltage divider in there at some stage, often between each stage, dumping some of that high mu tube's gain. So what I meant is instead of useing a tube with mu>80-100 and end up dumping some gain - and needing a CF to drive low-Z loads, why not just use a lower mu tube such as the 6922 and as a bonus be able to drive low-Z loads without a CF.
That's all, no offence intended.
Or the 6N1P which is cheaper. Another question: why all guitar amps (commercial units) use the 12AX7? There must be a reason. I've read (don't have much experience with that tube) that the 6922/6DJ8 doesn't last more than a few hundred hours before the sound goes dull and lifeless. As for your question about microphonics, yes, you can run into problems with the 6EJ7.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.