Ax84 amp

Recent News. This was recorded by the condenser mic in a Zoom PS with reverb added at that point. Welcome to the AX84 Homepage! The AX84 Project was originally started with these goals: Design and build a simple tube guitar amp Make information available and understandable to beginning DIY'ers Discuss the designs and apply them to future projects Promote an atmosphere of learning and camaraderie between folks who know and folks who want to know.

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Ax84 amp

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Content:

• AX84 Single Ended Lead-ANYONE BUILD IT?
• Custom 5W High Gain Tube Amp (AX84 HO) 2018
• Welcome To the Hoffman Amplifiers Forum
• DIY Tube Amplifier using schematics from ax84. 12ax7 for pre amp and el34 for power.
• GAA's AX84 P1 Rev 10
• DIYRE Wiki
• Henrik's tube amp builds
• Speaker for Ax84 P1...
• www.ax84.com
• P1 AX84 Guitar Tube Amplifier

WATCH RELATED VIDEO: AX84 Guitar Amp Build - Part 1

AX84 Single Ended Lead-ANYONE BUILD IT?

Post by KimSeiji » Thu Mar 01, pm. Post by Paul Barker » Thu Mar 01, pm. Post by KimSeiji » Fri Mar 02, pm. Post by Paul Barker » Fri Mar 02, pm. Post by Mike H » Fri Mar 02, pm. Post by Mike H » Sat Mar 03, pm. Post by KimSeiji » Tue Apr 03, pm. Post by Paul Barker » Tue Apr 03, pm. Privacy Terms. Quick links.

AX84 Amp - P1 We all start somewhere. As my new tube amp project, I decided to make a 'HH Scott ', but it was too much complicated, and requires a certain expertise. I just got started, here are some photos. And no doubts for now! I have a power transformer for the filaments, and I made a test circuit for the other voltages. Next week I buy the output transformer. This amp will be completed!! You do not have the required permissions to view the files attached to this post. The power transformer schematic you have drawn shows that you are half wave rectifying the mains.

It is much safer to use an isolation transformer for HT. But perhaps in your country what you have drawn is the normal way of doing things. Last edited by Paul Barker on Thu Mar 01, pm, edited 1 time in total.

I have just built my first guitar head amp I based it on the AX84, but I decided on a Fender feedback tone control in the first stage. I chose to use an alternative valve in place of the 12ax7 because that meant I could buy original Western world valves without paying stupid prices. I decided to drive the output valve in my case with a cathode follower.

I have found that the 6em7 makes an excellent voltage amplifier and cathode follower in a huge number of applications. Post by KimSeiji » Thu Mar 01, pm Paul Barker wrote: The power transformer schematic you have drawn shows that you are half wave rectifying the mains.

Paul Barker wrote: OK that is great. Post by Paul Barker » Thu Mar 01, pm cathode follower is similar to an opamp. It has a high input impedance and low input capacitance, but a low output impedance. With valve the input capacitance creates the high frequecy -3db roll off look at an RC filter, the R is the output impedance of the previous stage the C is the input capacitance of the next valve. Whatever the inter electrode capacitances may be all of the stages in your AX84 P1 are what is known as common cathode voltage amplifiers.

Common in this case refers to ground, you could call them grounded cathode but for some reason that is not the name which has stuck. In a voltage amplification stage like this the input capacitance is increased by the gain. You may know the Miller effect from opamp theory in which is it the stage gain plus one times the feedback capacitance. In triode theory it is the stage gain actual gain not the mu of the valve plus 1 time the capacitance between the anode and the grid.

Why I am telling you this is because the 12ax7 with a mu of has a very high stage gain in that amp it may be 60 I haven't actually calculated it. So the miller capacitance is very high. When you use a cathode follower as a buffer there is no stage gain , therefore no miller effect. A further advantage is that, when choke loaded it's voltage potential is nearly at zero, so you can direct couple it to the output valve if you use autobias on the output valve with a slight addition to the cathode bias resistor.

Or you can fixed bias the output stage with a small negative supply on the cathode follower. The other benefit of the cathode follower is it has a single stage feedback so is more linear. You will notice that the versions of the AX84 which ara progressions of your P1 circuit use a cathode follower buffer stage to power the tone stack.

But I feel they would be better to add a further buffer to drive directly the output valve. I decided whether rightly or wrongly not to include a tone stack. Maybe I was wrong, time will tell.

But all I was after was the tone of '60's '70's telecaster blues players. I wanted to build an amp which sounds bluesy and vintage. I don't really want it to drift too far into the Prog Rock era. I hope that an amp and guitar calculated to sound like a blues system will do that job better than the more flexible and manipulateable stratocaster into a rock amp wi th a whole range of tones. The may be the worst choice.

Perhaps I should have used a pair of el84's? But I have one thought that if the tone and distortion is achieved in the earlier stages, then a pure output valve may be worth a go, such as the The in itself has the right kind of pure tone, it may well make a very good output valve for a bluesy distortion provided by the alnico pickups in a telecaster, the simple tone control of a Fender amp of that same era and the overdrive in the amp.

Paul Barker wrote: When you use a cathode follower as a buffer there is no stage gain , therefore no miller effect. Paul Barker wrote: the other benefit is that it has a low output impedance which means it can pass decent amounts of current into the grid of a power valve.

Paul Barker wrote: The other benefit of the cathode follower is it has a single stage feedback so is more linear. Last edited by KimSeiji on Fri Mar 02, pm, edited 1 time in total.

At least I now have a speaker and an amp. Post by Mike H » Fri Mar 02, pm Paul Barker wrote: Why I am telling you this is because the 12ax7 with a mu of has a very high stage gain in that amp it may be 60 I haven't actually calculated it. Mike H wrote: Paul Barker wrote: Why I am telling you this is because the 12ax7 with a mu of has a very high stage gain in that amp it may be 60 I haven't actually calculated it.

There are so many stages and so many components that take away from the delciacy and tonality of the natural sound that compared to what I am used to hearing it sounded veiled. It was much better sounding that the AX84 clone. I hope this does not upset you. The Timbre was so good, the AX84 by comparrison had no Timbre to provide the sound of an acoustic instrument.

I know guitar players are looking for something different to me. I am the wrong sort of person to build a guitar amp. But for me the simple ealry Tweed or Vox is the way to go. But what do I know about the guitar world? I speak as I find as they say round here. Not with the intention of upseting anyone, purely to provide more information from which people can make an informed decision.

Custom 5W High Gain Tube Amp (AX84 HO) 2018

By Lump , July 20, in Amps. Can someone explain what this is? I'm not familiar with the term AX I tried a google search but could not get a clear explanation of what sort of amp this is.

Welcome To the Hoffman Amplifiers Forum

Welcome, Guest. Please login or register. Default Google Bing. Home Help Login Register. Read times. Oh wow, good to see this come back up. I still have the populated turret board that I used to build mine, somewhere in the shed.

DIY Tube Amplifier using schematics from ax84. 12ax7 for pre amp and el34 for power.

DIY Fever — Building my own guitars, amps and pedals. Idea to build this amp came after watching an amazing YouTube video of Glen Kuykendall with his Trainwreck. Caps in the pf range are silver mica and 1nF ceramic cap is MuRata. Signal resistors are all metal film, mix of nice brown Dale, few Xicon and Beyschlag.

GAA's AX84 P1 Rev 10

Welcome, Guest. Please login or register. Home Help Search Login Register. Pages: [ 1 ] Go Down. Mehfuzhoss Level 1 Posts: 33 I love Tube amps. Hello, I want to lower the db level.

DIYRE Wiki

The schematic is from the AX84 Project. AX84 is a website for people interested in designing and building do it yourself guitar amps. I highly recommend the website. I assume you're here because you want to see an AX84 P1 example, so this page describes the construction in some detail and give some tips based on my experience. Note that I used Revision 10 of the schematic. I built the amp as a combo. The chassis is a Hammond 12x8x2 steel chassis spray painted with Antique White enamel paint. From left to right on the front panel you see the input jack, volume, bass, mid, treble, standby switch, power switch and indicator light.

Henrik's tube amp builds

I think I'd like to experiment with the basic Marshall 18 Watt design, maybe put a Plexi front end on the EL84 power amp. Add some NFB and a presence pot. Maybe even use fixed bias. It didn't take long to realize I was not the first to have this idea.

Speaker for Ax84 P1...

RELATED VIDEO: Handmade AX84 P1 tube amp - pentode/triode mode

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www.ax84.com

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P1 AX84 Guitar Tube Amplifier

I n the course of fixing up an old Silvertone amp I bought on eBay, I came across www. After taking a look at the schematics for some of their amp projects, I realized it didn't look all that hard, and I ordered a kit from Chris The P1. The first amp I built is the P1.