#1
Is it possible to mod a valve amp, so it has a higher level of treble, and has more gain?

If so, how? or post a link =]

Thanks in adnvance

>> Its an Ashdown Fallen Angel btw, 60 watt combo
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Last edited by FNAFJ at Oct 31, 2007,
#2
what kind of valve amp? u think we're all psychics so we can guess???

valve jrs, blues jrs, hot rods are pretty common on the net.
Call me "Shot".

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#3
Ashdown fallen angel =] 6o watt combo =D
My Band =]
We play some goffic pish
Its fun

Leave us a comment, we'll get back to you =]
#4
it may be possible. i kno there is a way u can add a tube rectifier. Look on the Torres Engineering site. They have kits and books and stuff u can use.
#5
thanks, any advice on adding more treble boost?
My Band =]
We play some goffic pish
Its fun

Leave us a comment, we'll get back to you =]
#7
if u live in the US, u wanna buy one from me?
Call me "Shot".

ShotRod Guitar Works

Custom Hand-wired Amplifiers and Effect Pedals.

Est. 2007


Source to everything I say about Guitars, Pedals, and Amplifiers: I make them.


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#8
I don't have a schematic for that amp so I can't give you pics or even specific advice but I can speak in general terms.

lowering the value of the grid resistors will give you more gain
Lowering the value of the filter caps will increase high end
lowering the value of the coupling caps will increase high end
increasing the voltage going to the tubes for more gain and more high end
lower plate current for more high end and more volume but less breakup

These are some general ideas. If you don't know what the hell I'm talking about then you need to do a little more reading so that you can understand what some of this stuff is. If you do know what I'm talking about then we might be able to talk you through how to do this stuff.
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#9
a treble boost pedal :P
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#10
thanks for the people who are giving proper advice =]

Don't say treble boost pedal... or overdrive pedal.. thats just queer
My Band =]
We play some goffic pish
Its fun

Leave us a comment, we'll get back to you =]
#11
Quote by FNAFJ
Don't say treble boost pedal... or overdrive pedal.. thats just queer

its awesome!
Call me "Shot".

ShotRod Guitar Works

Custom Hand-wired Amplifiers and Effect Pedals.

Est. 2007


Source to everything I say about Guitars, Pedals, and Amplifiers: I make them.


UG's Best DIY PedalBoard
#12
Listen to Corduroy, that's really what you should be aiming for. You could also consider a new speaker as well with better high end response, that can cost quite a bit more though but in the long run you could always make a spare cab out of the old speaker and at least you would have a decent speaker in there.
#13
to Corduroy;
I didn't have any idea what that ment, could anyone link me to somewhere that I could learn about them from?
Thanks
My Band =]
We play some goffic pish
Its fun

Leave us a comment, we'll get back to you =]
#14
I have found that forums used a lot of jargon I didn't understand and nobody would define the terms for me. Eventually I gave up with the forums and started reading books on the subject. The best one I've seen so far is A Desktop Reference of Hip Vintage Guitar Amps by Gerald Weber. Then you can follow that up with his book "tube talk". You can find the books on ebay, from Kendrick, or I bet the library could get a copy of it for you. Reading these books will give you a general idea about how to improve your amp and it'll get you far enough along so that you can actualy talk to people on the amp tech forums.
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#15
right, I went on the wikipedia, and read up on what they are & what they do, so could you maybe post a guide giving me the general just of how to change them?

OR e-mail me something =]

itsmrbob@hotmail.co.uk

=P

thanks =]
My Band =]
We play some goffic pish
Its fun

Leave us a comment, we'll get back to you =]
#16
well you can get a schematic for your amp and locate the suggested capacitor or resistor. Then locate that on your amplifier and take a soldering iron and carefully de-solder the component. Then re-solder the new component in it's place.
#17
aah, that simple =P

Any idea where I can those parts?
My Band =]
We play some goffic pish
Its fun

Leave us a comment, we'll get back to you =]
#19
Quote by FNAFJ
to Corduroy;
I didn't have any idea what that ment, could anyone link me to somewhere that I could learn about them from?
Thanks


mate, that's basic electronics, if you have no idea what any of that ment, you should really not be thinking about modding up a massive complicated high gain tube amp. You could kill yourself. I'm not joking either, our phisycs teacher inadvertantley touched a 9 volt capacitor and it threw him across the room (not in class tho.) the type of capacitors in amps run on 100's of volts. And they can hold their charge for a very long time even after being unplugged. I think you should try out something simpler first like an FX pedal or a guitar. You can read all you like but imo, there's no substitute for experience, even if it's just small things it's better than nothing.
EH


"Show me war; show me pestilence; show me the blood-red hands of retribution..."
#20
I've got experience, I just don't know what the names of things are, I know how not to kill myself.
My Band =]
We play some goffic pish
Its fun

Leave us a comment, we'll get back to you =]
#21
well i'm still a bit skeptical seeing as if you've really done this before, you must know what a resistor and capacitors are and what raising and lowering the value means and how to do that. but if you're sure then fine. But if you die or **** up your amp then don't say i didn't warn you. Not saying that you will of course.
EH


"Show me war; show me pestilence; show me the blood-red hands of retribution..."
#23
i toughed a capasitor because my hand sliped and the amp was unpluged and i ended up having nerve damage in my fretting hand . be ****ing carefull
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#24
Fallen Angels are really, really complicated. I've checked our their schematics before and it's not even something I'd attempt.
New tubes, a new speaker and something along the lines of a booster and EQ is what I'd be aiming for.
"Everybody, one day will die and be forgotten. Act and behave in a way that will make life interesting and fun. Find a passion, form relationships, don't be afraid to get out there and fuck what everyone else thinks."
#25
^ Gah, darn those complicated amplifiers. If the world was full of nice little simple VJs, amp modding would be so much more fun.
#26
If the preamp tubes use cathode resistors, bypass (connect in parallel) the resistors with capacitors. Several microfarads should be sufficient to boost the gain as well as the treble response. Anything rated above 16 volts should be ok, since the voltage across the cathode resistor will be relatively low. Play at your own risk!!!!
#27
Quote by cokeisbetter
A 9 volt capacitor?


yes a 9volt capacitor. And we were talking about how CRT tellys have 400V caps! so PLEASE never take apart a telly!

Quote by the_random_hero
Fallen Angels are really, really complicated. I've checked our their schematics before and it's not even something I'd attempt.
New tubes, a new speaker and something along the lines of a booster and EQ is what I'd be aiming for.


i agree. I really don't see what you have against a booster pedal to be honest, plug it into the FX loop and you'll probably get a very similar sound to what you would by replacing any internal parts. And it will be much more powerful too.
EH


"Show me war; show me pestilence; show me the blood-red hands of retribution..."
Last edited by eddiehimself at Nov 3, 2007,
#28
Quote by eddiehimself
yes a 9volt capacitor. And we were talking about how CRT tellys have 400V caps! so PLEASE never take apart a telly!


Amps have 400v caps too. I put 600v filter caps in my bassman because it was burning up the 400's and stock values were 520 which they don't make anymore. So amps can be just as bad.
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#29
Quote by eddiehimself
yes a 9volt capacitor. And we were talking about how CRT tellys have 400V caps! so PLEASE never take apart a telly!

Well, most tube amps have about 300-ish volts on the plates, so the caps are above that. But seriously, nine volts can't really do much. Your pedals are (almost) all powered by a nine volt battery, so they'll have sixteen-or-so volt capacitors. Ever heard of someone killing themselves with a pedal? Nope. And the voltage rating of a cap is the maximum voltage that can go through it, there's not always four hundred volts running through a cap in your TV.
#30
Quote by cokeisbetter
Well, most tube amps have about 300-ish volts on the plates, so the caps are above that. But seriously, nine volts can't really do much. Your pedals are (almost) all powered by a nine volt battery, so they'll have sixteen-or-so volt capacitors. Ever heard of someone killing themselves with a pedal? Nope. And the voltage rating of a cap is the maximum voltage that can go through it, there's not always four hundred volts running through a cap in your TV.


I've been hit with 300V+ off a couple of caps and it didn't hurt that much. Hell, I've licked 9V batteries thousands of times. I don't see how a 9v cap can do much, especially as your skin resistance is so high, the current coming out of the cap would be minimal.
"Everybody, one day will die and be forgotten. Act and behave in a way that will make life interesting and fun. Find a passion, form relationships, don't be afraid to get out there and fuck what everyone else thinks."