From:
        
        John   (john-bridges@musician.org)
   Date:
        6/9/2000 9:14 PM
 Subject:
        Valverb mod?



Anybody ever hear of a mod that can done to a Peavey Valverb? My volume drops off a fair bit when I engage the tremolo. Any help would be
appreciated. 


  From:
        
        eS   (es@prairie.lakes.com)
   Date:
        6/10/2000 3:12 AM
 Subject:
        Re: Valverb mod?



I second the need for help on this. That volume loss renders useless what is otherwise a great trem. This seems to be true of all Valverbs, so I'd
think a good, standard mod for this problem must be floating around somewhere. 


  From:
        
        Steve Ahola   (steve_ahola@yahoo.com)
   Date:
        6/10/2000 4:24 PM
 Subject:
        Re: Valverb mod?



to John and eS:

    There is a schematic for this on my site if anybody wants to make some suggestions. I always wished that my Valverb had an adjustment for the
waveform (like on some of the ss tremelo boxes). I'm not sure which waves are the most usable- sine, square or saw tooth. I believe that some
LFO-based effects also have a switch so that amplitude rises in a linear vs. logarithmic manner. With the LFO circuit on this box being SS maybe
someone here can tell us which caps and resistors would control the waveform and slope...

    Here is the schematic:

http://www.ampage.org/blueguitar/valverb.gif

Steve Ahola 


  From:
        
        eS   (es@prairie.lakes.com)
   Date:
        6/11/2000 5:05 AM
 Subject:
        Re: Valverb mod?



Hey, thanks for the schematic, Steve. I know nothing about all this from the technical point of view, but I know that you're right on about tweaking
the waveform. It's got such a nice, warm, beefy tone as it is, but the waveform seems like it could stand a little refocusing. The intensity knob,
once it gets toward 1/2 up and beyond, gets kind of weird, too much of an on-off thing where the notes get lost somewhere and you can't find
them anymore. 


  From:
        
        Steve Ahola   (steve_ahola@yahoo.com)
   Date:
        6/11/2000 7:34 AM
 Subject:
        tboy- maybe move this to the Effects forum...



    With the vibrato circuit being entirely SS maybe we can get some better answers on this in the effects forum...

--Thanks!

Steve Ahola 


  From:
        
        Chris   (c.m.winsemius@hetnet.nl)
   Date:
        6/11/2000 4:40 PM
 Subject:
        Re: tboy- maybe move this to the Effects forum...



"Anybody ever hear of a mod that can done to a Peavey Valverb? My volume drops off a fair bit when I engage the tremolo. Any help would be
appreciated. " (eS)

+I didn't see a Valverb I.R.L. but I've looked at the schematic .

Does LED CR108 ( difficult to see which # it is ) light up at the trem-speed ?

IMHO the trem-circuit does add a big load to the first gainstage's output so effecting the gain of that stage . The "opto-area" of U100 might add
that higher load when the "trem-LED" (strangly marked as LDR in the schematic ) is getting some current .

So .......... I do think that's the area to mod .
-------------------------------------------------------------------------------------------------
"to John and eS:

There is a schematic for this on my site if anybody wants to make some suggestions. I always wished that my Valverb had an adjustment for the
waveform (like on some of the ss tremelo boxes). I'm not sure which waves are the most usable- sine, square or saw tooth. I believe that some
LFO-based effects also have a switch so that amplitude rises in a linear vs. logarithmic manner. With the LFO circuit on this box being SS maybe
someone here can tell us which caps and resistors would control the waveform and slope...

Here is the schematic:

http://www.ampage.org/blueguitar/valverb.gif " (Steve Ahola)

+try a different oscillator .
-------------------------------------------------------------------------------------------------
"With the vibrato circuit being entirely SS maybe we can get some better answers on this in the effects forum...

--Thanks! " (Steve Ahola )

+Those guys do know I think !

Good luck ! ,

Chris 


  From:
        
        anonymous
   Date:
        6/11/2000 5:52 PM
 Subject:
        broken gif



the gif at

http://www.ampage.org/blueguitar/valverb.gif 

won't load. 


  From:
        
        Chris   (c.m.winsemius@hetnet.nl)
   Date:
        6/11/2000 8:03 PM
 Subject:
        Re: broken gif



Hi ? !

"the gif at

http://www.ampage.org/blueguitar/valverb.gif 

won't load."

I just tried it and it did work !

If you give your email I'll send you it .

Have a good time !

Chris 


  From:
        
        Steve Ahola   (steve_ahola@yahoo.com)
   Date:
        6/11/2000 9:10 PM
 Subject:
        Re: broken gif



Chris:

    When you quoted the URL there was a double-quote mark at the end of the address... :(

--Thanks for your suggestions!

Steve Ahola 


  From:
        
        Chris   (c.m.winsemius@hetnet.nl)
   Date:
        6/11/2000 10:06 PM
 Subject:
        Re: broken gif



damned keyboard ! I use the "double-quote mark" to make it clear that the line is quoted . How do YOU do it ( type a quote ) ?

Luckely my guitar's got just 6 strings .

"--Thanks for your suggestions!" (Steve Ahola)

It's allright , thanks for the Blue Guitar Page ! ( I guess I'm not the only one to thank you ...

Chris 


  From:
        
        NYQUIST   (nyquist5@hotmail.com)
   Date:
        6/12/2000 4:20 PM
 Subject:
        Re: Valverb mod?



I had that problem with mine. You need to change the LDR in the circuit. It is temperature sensitive and its properties drift if it's heated too much.
It seems this is what happened on a lot of them at production...

I changed mine (bought the component from Peavey) and there's no volume drop since!

Of course, be carefull not to overheat when you solder it. 


  From:
        
        zachary vex
   Date:
        6/12/2000 5:13 PM
 Subject:
        Re: Valverb mod?



was it a black plastic vactrol?

zachary 


  From:
        
        Nyquist   (nyquist5@hotmail.com)
   Date:
        6/13/2000 11:42 AM
 Subject:
        Re: Valverb mod?



Yes it is black plastic with 5 pins. There's a center tap on the resistance. I don't know about other characteristics though.

My invoice says Peavey part number: 70240101.

Nyquist 


  From:
        
        zachary vex
   Date:
        6/14/2000 1:37 AM
 Subject:
        Re: Valverb mod?



thanks for mentioning the heat damage. i have had a few vactrols slip out of spec without explanation. one more thing to check.

zachary 


  From:
        
        eS   (es@prairie.lakes.com)
   Date:
        6/14/2000 3:04 AM
 Subject:
        Re: Valverb mod?



Hey Nyquist, thanks for that Peavey part number. That really makes this alot easier. I can hardly wait to start using the "other half" of my Valverb.


  From:
        
        Nyquist   (nyquist5@hotmail.com)
   Date:
        6/14/2000 4:09 PM
 Subject:
        Re: Valverb mod?



No probs.
Let me know how it works!

Nyquist