Go Back   Jemsite > Toolbox: Setup, Repairs and Mods > Tech: Setup, Repairs and Mods

Tech: Setup, Repairs and Mods Guitar workbench discussion such as setup, repairs, mods, installing new parts and more.



Registered Members don't see these ads. Register now it's free!

Reply
 
Thread Tools Display Modes
  #1  
Old 10-29-2009, 03:54 PM
Guitarist-Jonny Guitarist-Jonny is offline
 
Join Date: Dec 2006
Location: UK
Posts: 216  -  iTrader: (0)
Reviews: 12

Disconnecting Spring Reverb? Bias Mod? Peavey VK100


Hi all, I'm wondering if I would damage an amp (Peavey Valveking 100 head in my case) if I just disconnect a spring reverb? Do I need to connect the two phono style connectors together or something? The reason I'm asking is I don't particularly like the sound of spring reverb atm and if I can take the 'verb tank out I think my Peavey Valveking's power tubes will be easier to see from the front of the amp, which I think will look pretty awesome when they're glowing :P! If I bypass the spring reverb, could my tone change or anything?
Some of these answers may be obvious, but I have to make absolutely sure before I do anything as I don't want to ruin my amp !

Another thing, does anyone have any suggestions or experience on (how to do) a bias mod on the VK head? I read somewhere that it can make a fairly big positive difference to the tone, as well as giving me the ability to balance the current running through the tubes,which currently I can't do (which is worrying me a little as I need to change the tubes and don't want the new tubes prematurely wearing).
Thanks
Regards
Jon
Registered Members don't see these ads. Register now it's free!
Reply With Quote
  #2  
Old 10-31-2009, 01:46 PM
Guitarist-Jonny Guitarist-Jonny is offline
 
Join Date: Dec 2006
Location: UK
Posts: 216  -  iTrader: (0)
Reviews: 12

Re: Disconnecting Spring Reverb? Bias Mod? Peavey VK100


Ok, VK 100 bias mod is replacing R205 (39K) with a 20K fixed and a 50K Variable. Using the Tube amp doctor Bias Master (BM4) to measure the Bias (Oh, and I'm planning on doing this without killing myself xD).
Anybody know about the spring reverb? Can it just be removed and the red and white things be connected together? I'm not sure I still want to do this, but it's for future reference at least !
Thanks
Regards
Jon
Reply With Quote
  #3  
Old 10-31-2009, 03:11 PM
RSVampire RSVampire is offline
 
Join Date: Dec 2000
Location: Morgan Hill, CA
Posts: 1,789  -  iTrader: (5)

Re: Disconnecting Spring Reverb? Bias Mod? Peavey VK100


you should be able to just disconnect it and leave it alone. no need to connect the wires together.
Reply With Quote
  #4  
Old 11-02-2009, 01:45 PM
Guitarist-Jonny Guitarist-Jonny is offline
 
Join Date: Dec 2006
Location: UK
Posts: 216  -  iTrader: (0)
Reviews: 12

Re: Disconnecting Spring Reverb? Bias Mod? Peavey VK100


Thanks for the reply dude ! Are you sure of this?
Thanks
Regards
Jon
Reply With Quote
  #5  
Old 11-08-2009, 02:21 PM
SonicProvocateur SonicProvocateur is offline
 
Join Date: Nov 2009
Location: Gardendale, Al
Posts: 52  -  iTrader: (0)
Images: 1

Re: Disconnecting Spring Reverb? Bias Mod? Peavey VK100


Yes, just disconnect the RCA cables to disconnect the reverb function.

As for the bias mod, are you planning on running KT66s or 5881s or something? The Peavey is fixed bias, and biased on the warmer side so that you are less likely to blow power tubes and have more even wear on the tubes. Be sure to discharge the capacitors before working on everything, and familiarize yourself without the layout of the wiring diagram before doing something like a mod like that. It would be very easy to adjust the pot too cold and blow tubes/burn out a screen grid resistor, or worse, fry your transformer.

Good luck!
Reply With Quote
  #6  
Old 11-13-2009, 12:47 PM
Guitarist-Jonny Guitarist-Jonny is offline
 
Join Date: Dec 2006
Location: UK
Posts: 216  -  iTrader: (0)
Reviews: 12

Re: Disconnecting Spring Reverb? Bias Mod? Peavey VK100


Just want to adjust bias, the bias on it was set REALLY hot for my tubes so I wanted to cool it down. The caps are self discharging if I'm right. If not, how do I know which ones need discharging? What's the safest way of doing it?
I've done the bias mod. All tubes are recieving current, but only one pair are recieving signal (I have circuit diagrams I can post if this will help you help me :P.) I have had them down pretty low to test the sound. Before the bias mod I could see only one pair were working I'm sure, another reason for this is that when my 'texture' knob is to class A it's actually louder than my class A/B 'mode'. Will this just be a case of a blown resistor? If so, am I ok just using a multimeter to test the resistance of each resistor close to the screengrid to see if it gives a reading?
Thank you so much for your help !
Regards
Jon
Reply With Quote
  #7  
Old 11-14-2009, 10:38 AM
Guitarist-Jonny Guitarist-Jonny is offline
 
Join Date: Dec 2006
Location: UK
Posts: 216  -  iTrader: (0)
Reviews: 12

Re: Disconnecting Spring Reverb? Bias Mod? Peavey VK100


Ok, so one of my tubes is playing up- replaced them with an older pair this morning to find a HUGE improvement in sound quality. My only question now is, why does my Valveking get LOUDER when I turn the texture knob to class A? I'm presuming that, considering A/B mode is also captioned 'High Power', turning the texture knob towards A/B should give an increase in volume right?
Thanks
Regards
Jon
Reply With Quote
Comparison Shopping
D'Addario Nickel Wound Single Gauge Acoustic or Electric Guitar String 5-pack 5-

As low as $1

at 3 sellers

Blueridge BR-341 O Parlor Acoustic Guitar Natural

As low as $821

at 9 sellers

Members with more than 50 posts don't see this bar

ESP LTD EC Series Universal Guitar Case

As low as $89

at 7 sellers

Elite Standard 6868

As low as $499

at 7 sellers

Members with more than 50 posts don't see this bar

Homespun The Power of Delta Blues Guitar - 2 DVD Set

As low as $41

at 3 sellers

Fender Artist Series Stevie Ray Vaughan Stratocaster Electric Guitar 3-Tone Sunb

As low as $1420

at 9 sellers

Members with more than 50 posts don't see this bar

Luna Henna Paradise S Folk Style Cutaway Acoustic-Electric Guitar

As low as $549

at 7 sellers

EMG EMG-DG20 David Gilmour Pre-Wired Pickguard/Pickup Set Ivory

As low as $260

at 10 sellers

Members with more than 50 posts don't see this bar

Ernie Ball 2832 Regular Slinky Round Wound Bass Strings

As low as $15

at 6 sellers

Homespun Hymns, Spirituals and Sacred Songs (2-DVD)

As low as $27

at 12 sellers

Members with more than 50 posts don't see this bar

DR Strings Peacock Blues Extra Heavy Electric Guitar Strings

As low as $12

at 3 sellers

Everly B-52 Rockers Alloy Extra Light Electric Guitar Strings

As low as $6

at 4 sellers

Members with more than 50 posts don't see this bar

Seymour Duncan SH-13 Dimebucker Pickup

As low as $88

at 12 sellers

DR Strings FLAT WOUND 5 String Bass Medium (45-125)

As low as $27

at 8 sellers

Members with more than 50 posts don't see this bar

Reply

Tags
spring reverb


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

Sitemap:1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
All times are GMT -4. The time now is 02:31 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2009, Jelsoft Enterprises Ltd.
(c) jemsite.com
 
close
Sign up for free and join one of the largest communities of Jem guitar lovers!
Our members will be glad to help you with anything you need!

Join over 30,000 JemSite members!

Email

Email Confirm Email
Username
Password Confirm Password

I agree to the website rules