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Post subject: Re: 1993 Concert Amp
Posted: Sat Feb 06, 2016 6:10 pm
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He brought the amp to me with the chassis out of the cabinet. I initially just starting to look for damaged parts. I should have put it back together, but I didn't. I have nothing previous to go by other than what the owner told me. A big mistake by me.

He said there was no popping on the clean channel. The dirt channel would cut off and on, maybe pop slightly.

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Post subject: Re: 1993 Concert Amp
Posted: Mon Feb 08, 2016 4:11 pm
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Ok. I just changed out every preamp and power amp tube with good known tubes. Was doing the same popping. I changed from the clean to OD1 and OD2 channels. Then, went back to the clean channel. Played it for about 15 seconds, had some popping, OD1 and OD2 lights flickered, and then it changed to the OD1 channel without warning, and wouldn't go change back to clean at all. No matter what I did. I activated nothing.

This would explain why the footswitch is not working properly also. Footswitch only switches from clean to OD1. I see some relays on the schematic, but my inexperience is having a hard time figuring what does what. And the popping was not as bad after it got stuck on OD1.

Oh, and stratele, jumping the switches changed nothing.

Again, thanks in advance for everyone's help.

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2000 American Deluxe Stratocaster
2011 Gibson Les Paul Trad Pro 50's
2007 Epi Les Paul Custom
90's ESP Eclipse
JH-1B Jimi Hendrix Crybaby
Analogman KOT
Korg Pitchblack
Boss NS-2 PH-2
Blues Deluxe Reissue
1999 & 2007 Marshall TSL 100 w/1960BV cab


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Post subject: Re: 1993 Concert Amp
Posted: Mon Feb 08, 2016 4:23 pm
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My last post/ answer ; Tubes was the last thing to check.

Bad contacts, connexions , solders.
Tubes's socket contacts , dirty and / or loose.
Tubes issues .

These amps with printed circuit are not easy to work on


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Post subject: Re: 1993 Concert Amp
Posted: Mon Feb 08, 2016 4:32 pm
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stratele52 wrote:
My last post/ answer ; Tubes was the last thing to check.


Yes it was. I still have some checking to do. That was a quick and easy check. Just wanted to give an update of what just happened.

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2000 American Deluxe Stratocaster
2011 Gibson Les Paul Trad Pro 50's
2007 Epi Les Paul Custom
90's ESP Eclipse
JH-1B Jimi Hendrix Crybaby
Analogman KOT
Korg Pitchblack
Boss NS-2 PH-2
Blues Deluxe Reissue
1999 & 2007 Marshall TSL 100 w/1960BV cab


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Post subject: Re: 1993 Concert Amp
Posted: Tue Feb 09, 2016 11:09 am
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stratele52 wrote:
These amps with printed circuit are not easy to work on

Tell me about it, I even had to purchase a solder sucker or whatever they are called.

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Post subject: Re: 1993 Concert Amp
Posted: Tue Feb 09, 2016 1:16 pm
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I use many tools;

http://www.stanleysupplyservices.com/ed ... /p/114-202


https://www.tubesandmore.com/products/S-T503

https://www.tubesandmore.com/products/S-T7874B

And a good soldering station.

https://www.tubesandmore.com/products/S-TWES51


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Post subject: Re: 1993 Concert Amp
Posted: Tue Feb 09, 2016 1:23 pm
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stratele52 wrote:


+1

As well, I keep a tin of rosin paste with my soldering kit. It makes tinning multi-strand wire a snap.

Arjay

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Post subject: Re: 1993 Concert Amp
Posted: Tue Feb 09, 2016 1:27 pm
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Retroverbial wrote:
stratele52 wrote:

As well, I keep a tin of rosin paste with my soldering kit. It makes tinning multi-strand wire a snap.

Arjay



I didn't know it.


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Post subject: Re: 1993 Concert Amp
Posted: Tue Feb 09, 2016 4:25 pm
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Ouí, it's pretty handy.

Strip back the insulation from your multi-strand wire, twist the metal strands together, dunk it into the tin of rosin, then hit it with the iron while simultaneously feeding some solder to the heated tip and the pre-treated lead literally sucks the solder in.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: 1993 Concert Amp
Posted: Tue Feb 09, 2016 5:18 pm
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I have a desolder, and wick. Have used both when disconnecting components. Haven't upgraded to the soldering station yet. Still using the iron, 25w. Haven't screwed up anything yet. LOL I like that resin tip! Thx

I had lots of practice on my pair of Marshall TSL's. Did the bias drift on the older of the two, and many other suggested mods to make this amp more dependable, and eliminated the fizz that these amps are known to have on the Lead channel.

My problem is troubleshooting. I'm still young in this amp repair thing. I guess I'm more less a parts changer. I probably shouldn't be working on other peoples amps period! But I want to learn, cause this stuff is very interesting to me. I really enjoy it. And, I wanted to help other musicians in the Houston area.

_________________
2000 American Deluxe Stratocaster
2011 Gibson Les Paul Trad Pro 50's
2007 Epi Les Paul Custom
90's ESP Eclipse
JH-1B Jimi Hendrix Crybaby
Analogman KOT
Korg Pitchblack
Boss NS-2 PH-2
Blues Deluxe Reissue
1999 & 2007 Marshall TSL 100 w/1960BV cab


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Profile
Post subject: Re: 1993 Concert Amp
Posted: Wed Feb 10, 2016 3:20 am
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Retroverbial wrote:
Ouí, it's pretty handy.

Strip back the insulation from your multi-strand wire, twist the metal strands together, dunk it into the tin of rosin, then hit it with the iron while simultaneously feeding some solder to the heated tip and the pre-treated lead literally sucks the solder in.

Arjay


Thank you :D


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Post subject: Re: 1993 Concert Amp
Posted: Wed Feb 10, 2016 3:30 am
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TEXASBLUEZMAN wrote:
I have a desolder, and wick. Have used both when disconnecting components. Haven't upgraded to the soldering station yet. Still using the iron, 25w. Haven't screwed up anything yet. LOL I like that resin tip! Thx

I had lots of practice on my pair of Marshall TSL's. Did the bias drift on the older of the two, and many other suggested mods to make this amp more dependable, and eliminated the fizz that these amps are known to have on the Lead channel.

My problem is troubleshooting. I'm still young in this amp repair thing. I guess I'm more less a parts changer. I probably shouldn't be working on other peoples amps period! But I want to learn, cause this stuff is very interesting to me. I really enjoy it. And, I wanted to help other musicians in the Houston area.


A soldering station with regulated heat is a must. With differents tips.

A basic soldering iron do not work very well.

Printed circuit amps are the worst amps to learn. Too fragile and not easy access to parts. Easy to break printed circuit copper.
Point to point are better. tough and easy access to parts.

Troubleshooting ; It's really the only problem as in any repair for persons who have not studied electronics.


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Post subject: Re: 1993 Concert Amp
Posted: Wed Feb 10, 2016 8:27 am
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stratele52 wrote:
A soldering station with regulated heat is a must. With differents tips.

A basic soldering iron do not work very well.


+1

While I keep a basic soldering iron (100W, large chisel tip) on hand for heavy duty missions like attaching ground wires to a Strat's trem claw or a steel amp chassis, for more delicate duties involving turret/eyelet boards or PCB's a precision soldering station is a must.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: 1993 Concert Amp
Posted: Wed Feb 10, 2016 8:52 am
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Retroverbial wrote:
stratele52 wrote:
A soldering station with regulated heat is a must. With differents tips.

A basic soldering iron do not work very well.


+1

While I keep a basic soldering iron (100W, large chisel tip) on hand for heavy duty missions like attaching ground wires to a Strat's trem claw or a steel amp chassis, for more delicate duties involving turret/eyelet boards or PCB's a precision soldering station is a must.

Arjay


I have a Weller 100 watt for chassis ground and many other irons.

Before buying the 100 watts for chassis, I use two 40 watts in same times but I need a third hand :lol:

Having tools in one thing, how to use them it is another story.
Meter is a good exemple or tubes tester......


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Post subject: Re: 1993 Concert Amp
Posted: Wed Feb 10, 2016 2:45 pm
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stratele52 wrote:
Before buying the 100 watts for chassis, I use two 40 watts in same times but I need a third hand :lol:

You need helping hands for soldering. You know the magnifying glass with the roach clips thingy. I have an antique and made very well I must say, like things used to be.

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