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PostPosted: Tue Feb 22, 2011 2:08 pm 
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Mark II
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dlabrecque wrote:
Are you certain you're sending a clean tone into the amp? Have you tried it with several different guitars?

Also -- are you sure you're not overdriving the amp's input? All pedals turned off? Passive pickups on the guitar?


I've tried all the things you wrote. Obviously, no pedal was connected in the input.

All guitars are with passive guitars. Also, I've tried with single coils and humbuckers: always the same result.

The "overdriven" sound you can ear pumping up the master on the channels, with the loop on, is really unnatural. So it makes me think about a broken thing into the amp.


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PostPosted: Tue Feb 22, 2011 2:19 pm 
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Mark I

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Location: Tucson, Arizona, USA
I'd forgotten that the fuzzy sound was only with the loop engaged. That eliminates the possibility of the problem being at the input. Sorry. Sure sounds like something's broken in the amp. :(

I'd think your best bet is to take it into a good, local guitar amp technician.

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Dave "It's A Dry Heat" Labrecque
Tucson, Arizona

Dual Rectifier Solo
4x12 Rectifier Slant Front
1x12 Compact Open Back

Boss GT-10
2002 Gibson SG
2006 Fender MIM Stratocaster
2006 Fender MIM Telecaster
2004 Taylor 510CE


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PostPosted: Wed Feb 23, 2011 11:28 am 
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Mark II
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I'm trying to find a good local technician who has experience with Mesa products.

In the meantime, I restored the parallel loop and all the transistors.

By the way, the problem remains even with the parallel loop.


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PostPosted: Mon Feb 28, 2011 10:35 am 
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Mark II
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I wrote to the Mesa Italian referent, in the meantime I'd like to try several things to see if the problem is in the loop, or in the preamp-power amp section.

Do you think is it possible to use the "slave out" jack, instead of the send to use my pedals?

Then, if not possible, I'll use it into another power amp section, like the "return" of my Marshall 6100.


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PostPosted: Mon Feb 28, 2011 6:28 pm 
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Mark I

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Location: Tucson, Arizona, USA
DS-1 wrote:
I wrote to the Mesa Italian referent, in the meantime I'd like to try several things to see if the problem is in the loop, or in the preamp-power amp section.

Do you think is it possible to use the "slave out" jack, instead of the send to use my pedals?

Then, if not possible, I'll use it into another power amp section, like the "return" of my Marshall 6100.


Looks like the Slave jack won't work for you. From the manual:

This 1/4" jack and control provide a signal derived from the speaker jack. Perfect for using
either the DUAL or TRIPLE RECTIFIER Solo Head as a master pre-amp, or additional power amps may be connected for more power when needed. Some players use this to derive an FX Send Signal and go to other amps for their wet sound.

NOTE: Once a signal is taken from the Slave, it can not be inserted back into the FX Loop Return jack or a feedback loop will occur. Much like holding a microphone into the PA system's cabinets...a loud high pitched
squeal will occur.


Since there's no way to get the signal back into the amp downstream from this point, you won't be able to get the signal to the power amp section. You could go into another power amp, if you wanted; that's what the jack is designed for.

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Dave "It's A Dry Heat" Labrecque
Tucson, Arizona

Dual Rectifier Solo
4x12 Rectifier Slant Front
1x12 Compact Open Back

Boss GT-10
2002 Gibson SG
2006 Fender MIM Stratocaster
2006 Fender MIM Telecaster
2004 Taylor 510CE


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PostPosted: Thu Mar 03, 2011 8:30 am 
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Mark II
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Trying to explain my issue, here's the clips:

http://rapidshare.com/files/450745226/Loop.rar


I've recorded two clips:

- "loop_off.wav" was recorded using the hard bypass of the loop from the back of the amp;

- "loop_on.wav" was recorded using the "loop on" position on the rotary pot from the back of the amp.

I recorded the clips using the clean channel with all the knobs on 12 o'clock position.


With the loop on, it doesn't matter how cranked was the OUTPUT knob. It always sounds like a overdriven/fuzzy channel.

By the way, sorry for the bad quality of the clips, but I couldn't find my SM57, so I used a very cheap Sony mic.


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PostPosted: Tue May 03, 2011 6:13 pm 
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Bottle Rocket

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cscotto wrote:
Hi RDW1988,

I do not know why I cannot quote your post, but I will describe the wire to remove. The three you have circled are correct, but you only remove the wire on the far left facing the picture. In other words, labeling the wires 1, 2, and 3 from left to right facing the picture, you remove wire 1. If you look closely at the pad it is soldered into, you can see a little trace that connects it to the trace above it. That long trace comes from the Send pots middle wire or wiper pad. Make sure put electrical tape on the exposed wire end.
HTH


Hi to all,

cscotto

the mod are correct in this way?

loop from parrallel to serial is simply to remove this wire?

This not is a real serial loop the signal is dirty and is less than a 90%

Best Regards

Bye
Ricky

Image


Last edited by Rickyfly on Wed May 04, 2011 12:06 pm, edited 1 time in total.

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PostPosted: Wed May 04, 2011 12:01 pm 
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Bottle Rocket

Joined: Mon Apr 25, 2011 12:07 pm
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The mod that I describe below is for a truly serial fx loop without any return or ground effects.

is simple to perform.

All function working only pot mix are disconnected

Image

Image

I hope to be state aid

Best Regards
Ricky


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PostPosted: Thu Aug 04, 2011 2:16 pm 
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Bottle Rocket

Joined: Thu Aug 04, 2011 2:04 pm
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Have anyone tried Rickys FX serial mod?
It looks different from all others and sounds like the best solution.


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PostPosted: Thu Aug 04, 2011 3:09 pm 
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Mark I

Joined: Sat Oct 24, 2009 12:54 am
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Location: Tucson, Arizona, USA
>>All function working only pot mix are disconnected<<

>>I hope to be state aid<<

Can anyone clarify these statements?

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Dave "It's A Dry Heat" Labrecque
Tucson, Arizona

Dual Rectifier Solo
4x12 Rectifier Slant Front
1x12 Compact Open Back

Boss GT-10
2002 Gibson SG
2006 Fender MIM Stratocaster
2006 Fender MIM Telecaster
2004 Taylor 510CE


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PostPosted: Fri Aug 12, 2011 4:58 am 
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Bottle Rocket

Joined: Mon Apr 25, 2011 12:07 pm
Posts: 3
dlabrecque wrote:
>>All function working only pot mix are disconnected<<

>>I hope to be state aid<<

Can anyone clarify these statements?


means that all functions of the pedal switches are functioning.
unfortunately the only picture I took these I have already published.
however, the change is simple!

1) unsolder the 2 connectors send and return
2) fold the rear legs of the connectors
3) made the cable connections and isolate as described in the picture
5) Welded connectors again taking care to put insulation between the PCB and the hind legs
6) connect the cable to the foot valve

you have nice sound in the serial mode

Best Regards
Ricky


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PostPosted: Wed Nov 30, 2011 5:15 am 
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Bottle Rocket

Joined: Wed Nov 30, 2011 5:10 am
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Location: Pontefract, Yorkshire, ENGLAND
RDW1988 wrote:
Hey guys,

I'm new here, and I'm the owner of a 3ch Dual Rectifier.
The effects loop is a parallel one, and I'd like to mod it to a serial.

I opened up my rectifier, but I'm not sure which wires I need to cut.
Do I need to cut all three of them, or just one?
Here's a pic I took.

Image


When removing Wire 1 from this photo... Do wires 2 and 3 need to be soldered together in position 2?

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PostPosted: Mon Dec 19, 2011 3:41 am 
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Bottle Rocket

Joined: Tue Jul 13, 2010 11:21 pm
Posts: 7
Rickyfly wrote:
The mod that I describe below is for a truly serial fx loop without any return or ground effects.

is simple to perform.

All function working only pot mix are disconnected


I hope to be state aid

Best Regards
Ricky


Interesting, Can U show me the Schematic of this mod?

thanks for your times, Ricky

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PostPosted: Fri Jan 20, 2012 9:40 am 
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Bottle Rocket

Joined: Thu Apr 23, 2009 11:15 pm
Posts: 2
vuhaer wrote:
Rickyfly wrote:
The mod that I describe below is for a truly serial fx loop without any return or ground effects.

is simple to perform.

All function working only pot mix are disconnected


I hope to be state aid

Best Regards
Ricky


Interesting, Can U show me the Schematic of this mod?

thanks for your times, Ricky


it's the same mod shown in this previous post:

mikey383 wrote:
Those 3 three-pronged thingies are transistors. I suspect they are there to recover any gain lost from the loop.

The mod is actually a little easier than that, and you don't have to remove the transistors:

Image

The 0 ohm resistors are those blue ones beside the jacks with the single black stripe.

[EDIT]I removed the footswitch mod because I don't have the complete documentation.


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PostPosted: Sat Apr 27, 2013 5:35 pm 
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Bottle Rocket

Joined: Sat Apr 27, 2013 5:16 pm
Posts: 1
Hi Guys,

I have dual Rec 3 channel and wanted to know a definitive description to the correct mod which address the change of parallel loop to series loop as i have read through all the posts and im a little confused now to what one is the correct one.

1. what changes on the footswitch when the mod is done?
2. what changes to the controls on the back of the amp?
3. clear specific instructions on what wires to cut/solder
4. what are the results to the correct mod, is there still dry signal?
5. is there still level drop? i wouldnt need to turn effects loop on/off it would just be on all the time.

I want to use the effects loop with a boss giga delay, rocktron hush pedal & boss loop station

would be good to sort this out as i have followed the mod which states :
to lift the send and mix pot ends from the pcb board
put some electrical tape down so the send and mix tips on jack sockets are separated from pcb
cut all the wires from the mix control and tape up
then i took the middle lead from the send control and solder to tip of send jack socket ( is this ment to goto where the pin of the send jack socket was attached to the pcb?)
bridge the send and mix socket tips as per picture
mix jack socket left pin to pin 7 of valve? this i may have got wrong as im thinking it could also maybe from where the mix jack socket was attached to pcb that is ment to goto pin7 of the valve?


this is not very clear in the picture exactly how to connect this all up.

Ive wired it up how ive said and basically the footswitch doesnt work and i get very strange channel selections, with both clean and 2nd channel selected at the same time.
I didnt leave the amp on for very long as didnt want to damage it but something aint right with it.

please could someone advise me.

regards

Spence.


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