MyLesPaul.com
Homepage - Sponsors - Subscription - Auctions - Advertise - Spy  
Go Back   MyLesPaul.com > Music Gear > The Squawk Box
LIKE MyLesPaul on Facebook FOLLOW MyLesPaul on Twitter
  
Like Tree1Likes
  • 1 Post By Syrus

Reply
LinkBack Thread Tools Display Modes
Unread 01-31-2012, 05:53 AM   #1 (permalink)
Senior Member
 
Asdain's Avatar
 
Join Date: Jan 2011
Location: Aachen, Germany
Posts: 285
Thanks: 1
Thanked 2 Times in 2 Posts
Send a message via MSN to Asdain
Modding a Bugera V22

Hey Guys,

i plan on modding my little Bugera V22. Mainly the OD section needs some tweaking.
here is a schematic of the AMP:




I'd like some Input on my Ideas and maybe someone has more Suggestions as well.

I was planning the following points:

0. change the Bright Input to work more like a bright boost instead of a bass cut.
1. Raise Preamp Voltages
2. Increase Clean channel Gain
3. Rebuild the OD section, cold stage - hot stage, both with big grid stoppers
4. Increase output from the OD section
5.(Open the local feedback of V2b ?)
6. High Grid stopper for Cathodyne PI (!!!!!!!!!!!)
7. Slight changes to the Tonestack

Here is a little beta version of some mods i am plannning, just to see the direction in which this is going. i marked the changed things with lots of !!!'s, messy i know, but i haven't found a way to change colors in eagle yet..



PS: The reference schematic was drawn by netbear on the tubetown forums. I do NOT have other Bugera schematics
__________________

Last edited by Asdain; 01-31-2012 at 08:55 AM. Reason: linking gives me trouble..
Asdain is offline   Reply With Quote
Alt Today
Les Paul

Beitrag Sponsored Links

__________________
This advertising will not be shown in this way to registered members.
Register your free account today and become a member on MyLesPaul.com
   
Unread 01-31-2012, 08:37 AM   #2 (permalink)
Member
 
Razzle's Avatar
 
Join Date: Jul 2010
Location: AL
Posts: 80
Thanks: 2
Thanked 0 Times in 0 Posts
Re: Modding a Bugera V22

I'd be very interested in what you decide, and some sound clips on the differences. I love my v22.
Razzle is offline   Reply With Quote
Unread 01-31-2012, 08:58 AM   #3 (permalink)
Senior Member
 
Asdain's Avatar
 
Join Date: Jan 2011
Location: Aachen, Germany
Posts: 285
Thanks: 1
Thanked 2 Times in 2 Posts
Send a message via MSN to Asdain
Re: Modding a Bugera V22

so far the only change i made is i put in a Jensen C12Q Speaker that was originally intended for my current DIY build. It gives the Amp a more round and balanced sound. The original Bugera Speaker was not bad though, just a little bit too much bass and a slightly dull top-end.

tube changes will follow too (probably 2x Tung Sol 12ax7 RI, 1x Sovtek 12ax7LPS and JJ or EH EL84)
but the chinese ones do their job quite well actually and i will try to shape the sound with the circuit changes first.
__________________
Asdain is offline   Reply With Quote
Unread 03-05-2013, 01:59 AM   #4 (permalink)
Junior Member
 
Join Date: Mar 2013
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Modding a Bugera V22

i would love to try some of your proposed bugera v22 mods. the brite input mod and increasing gain on clean channel are especially interesting to me. i do not read scematics...but the v22 has all the resistors and caps , etc labeled. so perhaps you might take pity on the ( electronically challenged ) like me and tell us which # part to replace with what different value. done that sort of thing before with good results on blues junior.wnuld be grateful for any help.
fly a vee2 is offline   Reply With Quote
Unread 03-06-2013, 03:27 PM   #5 (permalink)
Senior Member
 
Syrus's Avatar
 
Join Date: Sep 2011
Location: Greyfield
Posts: 1,921
Thanks: 13
Thanked 40 Times in 14 Posts
Re: Modding a Bugera V22

Quote:
Originally Posted by Asdain View Post
so far the only change i made is i put in a Jensen C12Q Speaker that was originally intended for my current DIY build. It gives the Amp a more round and balanced sound. The original Bugera Speaker was not bad though, just a little bit too much bass and a slightly dull top-end.

tube changes will follow too (probably 2x Tung Sol 12ax7 RI, 1x Sovtek 12ax7LPS and JJ or EH EL84)
but the chinese ones do their job quite well actually and i will try to shape the sound with the circuit changes first.

Just a heads up but, you do realise that purple denotes sarcasm?

Tube swap is an easy reversible mod. Mind the bias of course.

I personally am more keen on experimenting with AlNiCo style speakers.
Good to hear that the C12Q gave it some more sparkle, however speakers break-in and they get a tad more mellow, so you might lose some of that top-end in a while.

The 7025 also gives great results in most amps I've tried in the past. Might be worth to take a look at one of those. I've had the best experiences with TAD 7025 tubes, price-performance wise.
TWANG likes this.
__________________

Syrus is online now   Reply With Quote
Unread 04-14-2013, 03:49 AM   #6 (permalink)
Junior Member
 
Join Date: Feb 2013
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Modding a Bugera V22

Quote:
Originally Posted by Asdain View Post
Hey Guys,

i plan on modding my little Bugera V22. Mainly the OD section needs some tweaking.
here is a schematic of the AMP:

I'd like some Input on my Ideas and maybe someone has more Suggestions as well.

I was planning the following points:

0. change the Bright Input to work more like a bright boost instead of a bass cut.
1. Raise Preamp Voltages
2. Increase Clean channel Gain
3. Rebuild the OD section, cold stage - hot stage, both with big grid stoppers
4. Increase output from the OD section
5.(Open the local feedback of V2b ?)
6. High Grid stopper for Cathodyne PI (!!!!!!!!!!!)
7. Slight changes to the Tonestack

Here is a little beta version of some mods i am plannning, just to see the direction in which this is going. i marked the changed things with lots of !!!'s, messy i know, but i haven't found a way to change colors in eagle yet..
Removing the capacitor C16 isn't a good idea because the Feedback network is DC coupled then. Therefore bias point isn't correct because a transformer is between.

Didn't have any detailed look/analysis at the other mods.

Did you already mod your amp?

BTW: Does someone know either the Range of the BIAS potentiometer or the value of the BIAS potentiometer in kOhm?

Thank you.

Wiesl
wiesl is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 04:58 PM.


Our Network: PRS Guitar Forum | Luthier Forum | SG Guitar Forum | Marshall Amp Forum | Music Gear Forum | 7 String Guitar Forum | Acoustic Guitar Forum

MyLesPaul proudly supports St. Jude Children's Research Hospital

Copyright © 2006-2014, MyLesPaul.com. All Rights Reserved.