Login / Register
 
Guitar Amp Mods
New Reply
Subscribe
#31
2nd January 2014
Old 2nd January 2014
  #31
Gear interested
 
Joined: Dec 2013
Posts: 6

danpenguin is offline
I have a Laney AOR protube 30 watt combo amp that I've been wanting to mod for a while. It was the first amp I bought in High School - and never liked the tone.

Here's a link to a youtube video of the amp:

Laney Protube AOR 3012 Demo - YouTube

I just read this article: 8 Guitar-Amp Mods for Newbies

Pretty informative.

I've been looking at amp kit build videos for the Plexi 45. Looks pretty cool. Here's what I want to know: what are the components that will affect the tone most?

Power transformer - not much affect on tone
Output transformer - yes
Capacitors - yes?
Transistors - yes?
Tubes - type (EL34 vs 6l6) and manufacturer (Mullard vs. Sovtek)

How much does PCB vs handwired turret board matter?

I want to simplify the amp. It has Three preamp knobs and push pull EQ.

I'm thinking lose preamp 1 and 2, simplify the EQ knobs, replace the output transformer (with what? What will make it better? Manufacturer? Type?) and try some values on the caps and resistors that more closely match what's in a Plexi.

I just want one preamp, master volume, bass, middle, treble and maybe keep the reverb. Will probably also try a different speaker.

Thoughts?
#32
3rd January 2014
Old 3rd January 2014
  #32
Gear Guru
 
John Eppstein's Avatar
 
Joined: May 2009
Location: San Francisco, CA.
Posts: 13,961

John Eppstein is offline
Quote:
Originally Posted by danpenguin View Post
I have a Laney AOR protube 30 watt combo amp that I've been wanting to mod for a while. It was the first amp I bought in High School - and never liked the tone.

Here's a link to a youtube video of the amp:

Laney Protube AOR 3012 Demo - YouTube

I just read this article: 8 Guitar-Amp Mods for Newbies

Pretty informative.

I've been looking at amp kit build videos for the Plexi 45. Looks pretty cool. Here's what I want to know: what are the components that will affect the tone most?

Power transformer - not much affect on tone
Output transformer - yes
Capacitors - yes?
Transistors - yes?
Tubes - type (EL34 vs 6l6) and manufacturer (Mullard vs. Sovtek)

How much does PCB vs handwired turret board matter?

I want to simplify the amp. It has Three preamp knobs and push pull EQ.

I'm thinking lose preamp 1 and 2, simplify the EQ knobs, replace the output transformer (with what? What will make it better? Manufacturer? Type?) and try some values on the caps and resistors that more closely match what's in a Plexi.

I just want one preamp, master volume, bass, middle, treble and maybe keep the reverb. Will probably also try a different speaker.

Thoughts?
Sell the amp. Get one you want.
#33
3rd January 2014
Old 3rd January 2014
  #33
Gear Guru
 
FFTT's Avatar
 
Joined: Dec 2005
Location: A stoned throw from ground zero
Posts: 11,855

FFTT is offline
Did the OP ever tell us what amp he was considering modifying?
#34
3rd January 2014
Old 3rd January 2014
  #34
Gear interested
 
Joined: Dec 2013
Posts: 6

danpenguin is offline
Well there are a few reasons I'd prefer to try modding the amp rather than sell it:
1) I'm not going to get much money out of it
2) I've never tried modding and want to give it shot
3) Want to keep it for sentimental reasons (it was my first amp)

Any other amps that I'd actually like to own are a good deal more than what I can get for this thing.
#35
3rd January 2014
Old 3rd January 2014
  #35
Gear interested
 
Joined: Dec 2013
Posts: 6

danpenguin is offline
#36
3rd January 2014
Old 3rd January 2014
  #36
Gear Guru
 
FFTT's Avatar
 
Joined: Dec 2005
Location: A stoned throw from ground zero
Posts: 11,855

FFTT is offline
If you want to get into amp building, try a basic 5-7 watt Champ circuit
or try it on something already affordable, like an Epiphone Valve Jr.

In any well made amp, the best mods are not mods at all but checking over
the amp for bad connections, dirty pots, replacing loose or cheap jacks and switches and then maybe trying some better quality tubes and better speakers.

Now if you have an old Marshall or Fender that needs refurbishing anyway,
there are plenty of fully reversible mods you can do that should
not affect their value, unless of course the work and materials are substandard.

Mods are more likely to decrease value than add to it for most buyers.

There are a few exceptions with known shops like Friedman, Bradshaw, Fargen etc.

If you just flat out hate the amp, sell it for whatever and put the funds towards something reasonably worthwhile and worth your investment.
__________________
Don't look at me in that tone of voice

Put music in your heart
and heart in your music
#37
3rd January 2014
Old 3rd January 2014
  #37
Gear interested
 
Joined: Dec 2013
Posts: 6

danpenguin is offline
I listened to some clips of that Epiphone Mod. Sounds fantastic!
#38
3rd January 2014
Old 3rd January 2014
  #38
Gear Guru
 
FFTT's Avatar
 
Joined: Dec 2005
Location: A stoned throw from ground zero
Posts: 11,855

FFTT is offline
Quote:
Originally Posted by danpenguin View Post
I listened to some clips of that Epiphone Mod. Sounds fantastic!
Even though the Valve Junior Head sounded pretty good stock with single coils,
it was $100.00 and with mods like $350.00 ish. The Turretboard.com mods are cool and affordable.

The Valve Junior Head cabinet is worth the price of the head as far as a mod base to mess with.

Allan Amps also has kits.

Take a look at the Chihuahua 10 watt kit.

Haven't been there for years, but 18watt.com has a ton of support for new builders,
plus I think turretboard.com has a forum as well.
#39
3rd January 2014
Old 3rd January 2014
  #39
Gear interested
 
Joined: Dec 2013
Posts: 6

danpenguin is offline
So here's the question: what's the difference between using an Epiphone head as the start for the mod vs. my Laney AOR? Is the Laney too complicated to begin with? Too much to remove?
#40
3rd January 2014
Old 3rd January 2014
  #40
Gear Guru
 
FFTT's Avatar
 
Joined: Dec 2005
Location: A stoned throw from ground zero
Posts: 11,855

FFTT is offline
Quote:
Originally Posted by danpenguin View Post
So here's the question: what's the difference between using an Epiphone head as the start for the mod vs. my Laney AOR? Is the Laney too complicated to begin with? Too much to remove?
I'm gonna guess way more complicated than it's worth.

If you're going to gut the stock chassis and just use it for a building base, that's
up to you.
#41
4th January 2014
Old 4th January 2014
  #41
Gear Guru
 
John Eppstein's Avatar
 
Joined: May 2009
Location: San Francisco, CA.
Posts: 13,961

John Eppstein is offline
Quote:
Originally Posted by danpenguin View Post
Well there are a few reasons I'd prefer to try modding the amp rather than sell it:
1) I'm not going to get much money out of it
2) I've never tried modding and want to give it shot
3) Want to keep it for sentimental reasons (it was my first amp)

Any other amps that I'd actually like to own are a good deal more than what I can get for this thing.
That's not the amp to start with. And the "mods" you're talking about essentially entail ripping the guts out, throwing them away, and starting over. Not a task for a novice.
__________________
All opinions expressed in my posts are solely my own: I do not represent any other forums (of which I may or may not be a member), groups, or individuals although at times my views may resemble those of other entities.

************************************
Inside every old man is a young man wondering WTF happened.

Quote:
Originally Posted by Bob Ohlsson
The appropriate role for science is the study of observed phenomena to gain an understanding. It is not dictating what people ought or ought not to be observing.
#42
4th January 2014
Old 4th January 2014
  #42
Gear Guru
 
John Eppstein's Avatar
 
Joined: May 2009
Location: San Francisco, CA.
Posts: 13,961

John Eppstein is offline
Quote:
Originally Posted by danpenguin View Post
So here's the question: what's the difference between using an Epiphone head as the start for the mod vs. my Laney AOR? Is the Laney too complicated to begin with? Too much to remove?
Yes and yes.
#43
4th January 2014
Old 4th January 2014
  #43
Gear interested
 
Joined: Jan 2014
Posts: 14

Thunk is offline
One point is what do you want from this venture? Is it a means to an end or is the journey more exciting? Is it more important to wind up with something really cool or is it more important to simply have fun trying?

If you are doing this just to have fun tinkering with an old amp you can pay less attention to the practical advice here and just do whatever. You may end up with something better suited as a boat anchor, but I guarantee you will learn tons in the process. And you will also have a fun time if being extremely frustrated is fun for you .

A couple of things:

1. If you know nothing about electricity/electronics get some basic knowledge. A few good sites were mentioned and I'd like to add AX84.com. They even have good beginner projects you might find interesting.

2. Know what will kill you. Parts of tube amps have 600+ volts. Knowing how to make an amp safe to work on is important! Don't just unplug -- discharge those electrolytic caps!

3. Know how to turn on an amp after you modded it. Sounds silly, but people wind up in the hospital after soldering a wire to the wrong terminal and turning the power on. At the ax84.com site you will find a link to a document that describes a safe power on procedure. Read it.

And above all, SAFETY FIRST.


Happy Modding!

Last edited by Thunk; 4th January 2014 at 06:01 PM.. Reason: Formatting & grammer
Quote
1
#44
4th January 2014
Old 4th January 2014
  #44
Gear Guru
 
FFTT's Avatar
 
Joined: Dec 2005
Location: A stoned throw from ground zero
Posts: 11,855

FFTT is offline
If a complete build from turret board is over your head, consider a complete Ceriatone chassis and mount it in a generic head cab from Mojotone Music Supply
or DIY head cab.

Check out this little Ceriatone Express clone.



http://www.ceriatone.com/productSubP...s_Complete.htm



You can see Nik offers the chassis in various stages of completion.
Lots of people opt to order the chassis without transformers to save shipping weight and also to use even higher quality American transformers, NOS tubes, etc.

Look at the size of those transformers for a little 15 watter.
Big Iron = Depth of tone.
#45
4th January 2014
Old 4th January 2014
  #45
Lives for gear
 
mdme_sadie's Avatar
 
Joined: Nov 2007
Location: Santa Rosa CA
Posts: 1,572

mdme_sadie is offline
Quote:
Originally Posted by danpenguin View Post
I have a Laney AOR protube 30 watt combo amp that I've been wanting to mod for a while. It was the first amp I bought in High School - and never liked the tone.

Here's a link to a youtube video of the amp:

Laney Protube AOR 3012 Demo - YouTube

I just read this article: 8 Guitar-Amp Mods for Newbies

Pretty informative.

I've been looking at amp kit build videos for the Plexi 45. Looks pretty cool. Here's what I want to know: what are the components that will affect the tone most?

Power transformer - not much affect on tone
Output transformer - yes
Capacitors - yes?
Transistors - yes?
Tubes - type (EL34 vs 6l6) and manufacturer (Mullard vs. Sovtek)

How much does PCB vs handwired turret board matter?

I want to simplify the amp. It has Three preamp knobs and push pull EQ.

I'm thinking lose preamp 1 and 2, simplify the EQ knobs, replace the output transformer (with what? What will make it better? Manufacturer? Type?) and try some values on the caps and resistors that more closely match what's in a Plexi.

I just want one preamp, master volume, bass, middle, treble and maybe keep the reverb. Will probably also try a different speaker.

Thoughts?
Change the speaker. Seriously everyone goes on and on about tone mods for amps, but an amps tone is about 90% the cab. It's the simplest mod you can do and it'll give you the greatest effect.

Most amp mods are about changing the amount of gain and the distortion characteristics, these are for the most part pretty subtle changes compared to changing out the cab, adjustments to the workflow with more options and tone stack adjustments have a greater effect but rarely make the things any better.

If you really can't be deterred and want to get into amp modding I'd suggest getting in to amp building first so you can see how the different circuits work (most are variations of fender circuits), then go from there.

Otherwise focus on the other area everyone ignores with tone, which is the playing technique and arrangement. It's the cheapest option and it works with any amp.
#46
4th January 2014
Old 4th January 2014
  #46
Gear Guru
 
FFTT's Avatar
 
Joined: Dec 2005
Location: A stoned throw from ground zero
Posts: 11,855

FFTT is offline
You can always find a home for a good speaker, so sure that's a start,
but if you really want to get into DIY building, take it carefully step by step.

If you just want a great amp for under $1000.00 I guarantee you Ceriatone
is putting out better quality than current production Marshall anything.

You can do cabinets and speaker cabs and speakers and refine the critical amp components, but at least you end up with a rippin rig when you're done.
#47
6th January 2014
Old 6th January 2014
  #47
Gear addict
 
eve69's Avatar
 
Joined: Apr 2012
Posts: 370

eve69 is offline
Tubes are one of the finest mods. Some fun tubes too like 12BZ7s and stuff for the PI. The old great tubes allow greater range - some more lows - some more highs - some break up fast, some slow. Those little tweaks can build up some differences, and they are a simple mod.
__________________
...or something.
#48
6th January 2014
Old 6th January 2014
  #48
Gear nut
 
Joined: Apr 2011
Posts: 75

GVIS is offline
Well, I've been down this road. Cut my hellhound combo into a head because I realized I just don't like combos and I'll keep the amp forever.

Did the same for deville 4x10, although I really wasn't sure I'd keep it forever. Also had a guy mod it to sound similar to a JCM 800. Lots of stuff changed, including transformer. Runs el34s.

The gain side comes pretty close, but it's fizzier imo, and the bass is not the best imitation. Not bad though, considering the amp he started with.

The real surprise was how cool the clean channel came out. Due to the tone stack design and shared eq, messing with the gain side to get higher gain affected the clean channel. In this case it's got this great, thick, somewhere between marshall and dumble vibe that's so thick it takes high gain distortion pedals to get it to break up; but when it does it's just crushing, with endless sustain; nothing else sounds like it. Many distortion pedals will work, but believe it or not a metal muff, which normally is far too thin and tinny for my tastes, works best here.

It was a gamble, and it required some revoicings to get it acceptable/useable. Not super expensive, but enough to have bought a nice used high gain amp. Not sure I'd do it again, but I do like having something unique.

Did the chopping into a head myself. What was the top is now the front. I use a weber amp switcher to toggle between amps, which is just great; fender like with the hellhound/6l6s or marshall/dumble like with the deville/el34s. And I mean like; not really accurate representations.

Cabs are over sized lopolines with swamp thangs. Huge sound. Not tight and punchy like a 4x12, but big everywhere, with pounding bass if I want it. And little speaker breakup, which I'm not a fan of. Just what i wanted. Everyone who plays the setup (all better players than me...lol) is left blown away. Unfortunately I still haven't had an opportunity to play it in a band setting. Haven't recorded enough with it yet to how that goes, but will soon.

I've never been out to cop standard tones for a base setup, so I'm happy for now. But one day i'm sure I'll add some higher end amps and more standard cabs.
Attached Thumbnails
Guitar Amp Mods-013y.jpg  
#49
6th January 2014
Old 6th January 2014
  #49
Lives for gear
 
Joined: Jan 2012
Posts: 1,041

Frodebro is offline
Quote:
Originally Posted by FFTT View Post
Did the OP ever tell us what amp he was considering modifying?
This thread was started in 2003, I don't think it matters at this point.
#50
6th January 2014
Old 6th January 2014
  #50
Gear Guru
 
John Eppstein's Avatar
 
Joined: May 2009
Location: San Francisco, CA.
Posts: 13,961

John Eppstein is offline
It was revived by a guy with a Laney AOR protube 30, so I assume that's what we're talking about now. From what he says he wants he might as well just get a different amp, either that or rip all the guts out except the transformers and build something from scratch in the chassis.

EDIT: I just downloaded the schematic, circuit doesn't look too bad. Tried to find some pics inside the chassis, looks like a PC board amp that might be kind of a pain in the butt to work on.

Not as much of a pain as a friggin' DeVille, however. Those things are nightmares.
#51
6th January 2014
Old 6th January 2014
  #51
Lives for gear
 
Joined: Jan 2012
Posts: 1,041

Frodebro is offline
Quote:
Originally Posted by John Eppstein View Post
It was revived by a guy with a Laney AOR protube 30, so I assume that's what we're talking about now. From what he says he wants he might as well just get a different amp, either that or rip all the guts out except the transformers and build something from scratch in the chassis.

It doesn't look like a good foundation for modding, really.
FFTT specified "OP", so I assumed he was referring to the original poster/thread starter.

I agree on the Laney thing, you have to draw a line on what is worth digging into and what isn't, and for that list of mods you might as well just gut the whole thing and stuff a completely new circuit in there.
#52
6th January 2014
Old 6th January 2014
  #52
Gear Guru
 
FFTT's Avatar
 
Joined: Dec 2005
Location: A stoned throw from ground zero
Posts: 11,855

FFTT is offline
I think if he really wants to learn how to build, then he's better off starting with
a complete kit including new chassis box.

Trying to retrofit a gutted chassis is more trouble than its worth in this case.
#53
7th January 2014
Old 7th January 2014
  #53
Gear interested
 
Joined: Dec 2013
Posts: 6

danpenguin is offline
Guys, I really appreciate all the input. I'm going to put the mod project on hold for now. First reason is: I ended up putting the Laney up for sale on eBay on Sunday.
I've got four other amps that work great and what I really want is a solid mic pre. So, selling the amp for whatever scratch I can get out of it.
The other reason is that most of the folks on this thread advised not to bother with this particular mod. I think if I'm going to do a project I'll try the Ephiphone one. Looks cool and sounds great on the youtube clips.
New Reply Submit Thread to Facebook Facebook  Submit Thread to Twitter Twitter  Submit Thread to LinkedIn LinkedIn  Submit Thread to Google+ Google+ 
 
Thread Tools
Search this Thread
Search this Thread:

Advanced Search
Similar Threads
Thread
Thread Starter / Forum
Replies
manning1 / Music Computers
15
NickH / Geekslutz forum
6
Zack Dust / So many guitars, so little time!
3
6strings / So much gear, so little time!
3
drBill / So much gear, so little time!
12

Forum Jump

SEO by vBSEO ©2011, Crawlability, Inc.