Main Forums >> Guitar Technology
        Print Thread

Pages: 1

Joined: 28/06/11
Posts: 7
Two preamps at once??! new
      #948667 - 23/10/11 08:40 AM
Hello, I'm just sorting out my rig and its getting more complex and I need a bit of help. Currently I'm using a JMP-1 preamp. I run it through the return of my fx loop of my Marshall TSL60 Head - so effectively bypassing the TSL60 preamp and solely using the head's poweramp. So...that's all fine, but for my clean tones I really want to use the clean channel on the TSL60 head. Is there any way i could set something up where I can carry on using the tsl60 as a poweramp but switch between the jmp1 preamp and tsl60 preamp instantly??? And...not only that but I'd like my g major to work with both???!!!!


Post Extras: Print Post   Remind Me!   Notify Moderator     Back to top
Jack Ruston

Joined: 21/12/05
Posts: 5071
Re: Two preamps at once??! new [Re: plantingclaymore]
      #948673 - 23/10/11 09:26 AM
Not easily. You'd need a buffered AB box, one to go after the guitar, switching between the JMP1 input and the TSL input. AND you'd need a way to bypass the fx loop. As for the processor you'd have to put it between the guitar and the AB and use it in series. Honestly, if I were you I'd either...

1. Sell the JMP and the TSL and buy something that has channel switching that you can live with.
2. Buy a power amp and speaker for the JMP1.

In option 2 you can either run the FX in series but what you might consider is running them through the FX loop of the TSL, and then using an ABY box to add the JMP for gainy sounds, but leaving the clean running underneath with the fx on the clean sound. It might not be what you want, but it can be a very cool sound.



Post Extras: Print Post   Remind Me!   Notify Moderator     Back to top

Joined: 28/06/11
Posts: 7
Re: Two preamps at once??! [Re: Jack Ruston]
      #948677 - 23/10/11 09:53 AM
Nice one thanks, might try and percivier with the original idea with the ab box you speak of. I might be after the impossible as i'd probably want the g major to have different effects on both. I could switch preamps but then i'd have to switch effects, tricky dancing. Its that quest for the perfect sound without compromising which is tricky at times. I need the precision and cutoff of the jmp1 distortion but the warmth and lushness of the tsl60 clean. Hopefully i'll get there in the end....cheers

Post Extras: Print Post   Remind Me!   Notify Moderator     Back to top

Joined: 29/05/06
Posts: 7906
Loc: northampton uk
Re: Two preamps at once??! new [Re: plantingclaymore]
      #948689 - 23/10/11 11:34 AM
Hmm, I can't see why, in principle you cannot treat the amp send as one feed and the preamp as the other and feed both to a simple, passive A/B box. That feeds the FX return to the amp and you can put the g-major in that link.

A passive splitter (3 jacks soldered pin for pin) will get guitar into the two inputs, seeing 500k instead of 1meg will have little effect.

In PRACTICE the levels could be all over the shop! Talk to The Men at they will know of such things. But in any event you can do no harm if you try.


Post Extras: Print Post   Remind Me!   Notify Moderator     Back to top
Music Wolf

Joined: 17/02/06
Posts: 1108
Loc: Exiled to St Helens
Re: Two preamps at once??! new [Re: ef37a]
      #948738 - 23/10/11 05:46 PM
Boss LS2 Line switcher?

Guitar to LS2 input.

LS2 Loop A send to TSL input
TSL effect send to LS2 Loop A return
LS2 Loop B send to JMP1 input
JMP1 output to LS2 Loop B return
Output of LS2 to TSL effects return.

Loop A and B have their own level so no problem matching volumes.


Post Extras: Print Post   Remind Me!   Notify Moderator     Back to top
Pages: 1

Rate this thread

Jump to

Extra Information
0 registered and 21 anonymous users are browsing this forum.

Moderator:  David Etheridge, James Perrett, zenguitar, Martin Walker, Forum Admin, Hugh Robjohns, Zukan, Frank Eleveld, SOS News Editor,  
Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled
Thread views: 4294

June 2016
On sale now at main newsagents and bookstores (or buy direct from the SOS Web Shop)
SOS current Print Magazine: click here for FULL Contents list
Click image for June 2016
DAW Techniques


Home | Search | News | Current Issue | Tablet Mag | Articles | Forum | Blog | Subscribe | Shop | Readers Ads

Advertise | Information | Privacy Policy | Support | Login Help


Email: Contact SOS

Telephone: +44 (0)1954 789888

Fax: +44 (0)1954 789895

Registered Office: Media House, Trafalgar Way, Bar Hill, Cambridge, CB23 8SQ, United Kingdom.

Sound On Sound Ltd is registered in England and Wales.

Company number: 3015516 VAT number: GB 638 5307 26


We accept the following payment methods in our web Shop:

Pay by PayPal - fast and secure  VISA  MasterCard  Solo  Electron  Maestro (used to be Switch)  

All contents copyright © SOS Publications Group and/or its licensors, 1985-2016. All rights reserved.
The contents of this article are subject to worldwide copyright protection and reproduction in whole or part, whether mechanical or electronic, is expressly forbidden without the prior written consent of the Publishers. Great care has been taken to ensure accuracy in the preparation of this article but neither Sound On Sound Limited nor the publishers can be held responsible for its contents.
The views expressed are those of the contributors and not necessarily those of the publishers.

Web site designed & maintained by PB Associates | SOS | Relative Media