TSL60 FX loop and channel switching delay

marshalltsl

marshalltsl

Well-Known Member
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Hi all!
Recently I bought a used cheap TSL60. It is the cheapest Marshall heads that I bought ever. The seller said It works perfectly but It is unused for 5 years. I took a chance and bought it. When It arrives I get really pissed off. I felt cheated. Take a look at the pictures. Burned and bridged HT fuse. Speaker output broken. Faulty on 6 pin Din connector from TSL footswitch. I fixed all. I replaced power tubes.IMG_20200910_232708_305.jpgIMG_20200910_214023_690.jpg

Now It runs ok but It has a delay when I'm switching channel clean to OD channels, just a few miliseconds but my TSL100 don't do It. Also when I switch off the reverb you can listen a little pop. I can live with that smalls issues.

The parallel FX loop it's strange. It has to much guitar signal from the amp. I can ajust It on my multieffects rack but If I use a looper It sounds weak and low.
Can I mod It to get a properly serial FX loop? Can I mod It to get more return signal?

Thanks in advance.
 
marshalltsl said:
Hi all!
Recently I bought a used cheap TSL60. It is the cheapest Marshall heads that I bought ever. The seller said It works perfectly but It is unused for 5 years. I took a chance and bought it. When It arrives I get really pissed off. I felt cheated. Take a look at the pictures. Burned and bridged HT fuse. Speaker output broken. Faulty on 6 pin Din connector from TSL footswitch. I fixed all. I replaced power tubes.View attachment 48852View attachment 48853

Now It runs ok but It has a delay when I'm switching channel clean to OD channels, just a few miliseconds but my TSL100 don't do It. Also when I switch off the reverb you can listen a little pop. I can live with that smalls issues.

The parallel FX loop it's strange. It has to much guitar signal from the amp. I can ajust It on my multieffects rack but If I use a looper It sounds weak and low.
Can I mod It to get a properly serial FX loop? Can I mod It to get more return signal?

Thanks in advance.
Click to expand...
I have no answer for ya bro, but PM Ampmad I am sure he can help you out.
Cheers
Mitch
 
marshalltsl said:
Thanks so much brother! I will do it
Click to expand...

Això és típic per a un amplificador usat.

La gent ven amplificadors quan no vol reparar-los.

Hi ha un procediment de prova per comprovar la placa de circuit.

Molts d’aquests amplificadors tenen un error d’aïllament entre l’alta tensió i la tensió de polarització.

Això provocarà un fracàs freqüent dels tubs de sortida ...


That's typical for a used amplifier.
People sell amps when they don't want to repair them.

There is a test procedure for checking the circuit board.
Many of these amps have a insulation failure between the high voltage and the bias voltage.
This will lead to frequent failure of the output tubes...
 
Thanks AMS! Thankfully the TSL60 it's the only amp from JCM2000 range without bias drift issue. The bias it's OK. No noises on It. Mother board Insulation it's Ok.

But If you want I can do some voltage tests on it. We can show to all members how do It.
 
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Also I want say if you turn down the volumen on OD channel with a looper on fx loop you can't listen It.
I explain better. If I have a looper running on the FX loop with the master volumen at 10 or with the master in any setting, and you turn down OD channels volume you can't listen the looper.
Maybe it's a normal funtion but I think the TSL60 looper it's so strange. Some TSL60 user here?

Thanks!
 
marshalltsl said:
Also I want say if you turn down the volumen on OD channel with a looper on fx loop you can't listen It.
I explain better. If I have a looper running on the FX loop with the master volumen at 10 or with the master in any setting, and you turn down OD channels volume you can't listen the looper.
Maybe it's a normal funtion but I think the TSL60 looper it's so strange. Some TSL60 user here?

Thanks!
Click to expand...
Yes
there needs to be some type of modification.
 
Hi
Defently the FX loop needs a deep modification.
Finding someone who knows how to correctly modify this loop in my area is impossible. Technicians I know only know how to critique a Marshall with PCB Boards. Their only intention is to sell their amps brand.
 
marshalltsl said:
Hi
Defently the FX loop needs a deep modification.
Finding someone who knows how to correctly modify this loop in my area is impossible. Technicians I know only know how to critique a Marshall with PCB Boards. Their only intention is to sell their amps brand.
Click to expand...


No és impossible.
Esteu a les sales de tons. A les sales de tons, tot és possible.

It's not impossible.
You are at the Tone Rooms. At the Tone Rooms, anything is possible.
 
marshalltsl said:
Thanks AMS! I'm really glad to be here. Let's see if it's possible. A TSL 60 deserve have a properly FX loop. A TSL 100 has a useful/better FX loop to my needs.
Click to expand...

D'acord
Intentem fer que el bucle d'efectes sigui serial i suprimim el paral·lel.
Llavors vegeu com sona.

OK
Let's try to make the effects loop serial, and remove the parallel.
Then see how it sounds.

TSL60 Serial Loop.jpg
 
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Ok. But you know I change some values on the FX board to get better return level. Do you recoment reinstall original values on the FX board?
Thanks!
 
marshalltsl said:
Ok. But you know I change some values on the FX board to get better return level. Do you recoment reinstall original values on the FX board?
Thanks!
Click to expand...



No, canvieu les parts del bucle d'efectes com abans per fer el nivell de retorn correcte.
Ara proveu el bucle d'efectes i comproveu si funciona correctament.
El bucle d'efectes funciona correctament ara i sona bé?

No, change the parts in the effects loop as before to make the return level correct.
Now test the effects loop and see if it works correctly.
Does the effects loop work correctly now, and does it sound OK?
 
IMG_20200923_194320_193.jpg

I did It. Now all FX loop is a serial loop. But just the clean channel have a real serial FX loop. Also I don't have sound from my TSL60, just I have sound from it when FX loop it's on. When FX loop it's on OD channels you have 3 master volume. Master volume, FX mix and OD channels volume. You need OD channels volume at 10 to get a properly FX loop.
 
marshalltsl said:
I want to say that the overall fx sound it's a little darker without R123. It need more presence. :)
Click to expand...

És possible que hi hagi alguna cosa més amb l’amplificador.
Hi hauria d’haver so si el bucle d’efectes està activat o desactivat.
Quan el bucle d'efectes està apagat, encara hauria d'haver-hi un senyal ignorat.

O és possible que tinguem un esquema equivocat.
De vegades, amb els amplificadors Marshall, l'esquema no mostra els números de peça correctes per coincidir amb els números de peça impresos a la placa de circuit.
O de vegades hi ha més d’una versió de la placa de circuit i els números de peça a la placa no coincideixen amb l’esquema.

Investigaré i veuré si hi ha un esquema diferent. O comprovaré si hi ha més d’una versió del tauler que estem mirant. Em sap greu que no hagi funcionat, però potser si trobem més informació ho podem tornar a provar.

There might be something else wrong with the amplifier.
There should be sound if the effects loop is on or off.
When the effects loop is switched off, there should still be a bypassed signal coming through.

Or it might be possible that we have the wrong schematic.
Sometimes with Marshall amplifiers, the schematic does not show the correct part numbers to match the part numbers printed on the circuit board.
Or sometimes there is more than one version of the circuit board and the part numbers on the board do not match the schematic.

I will research and see if there is a different schematic.
Or I will check to see if there is more than one version of the board that we are looking at.

I'm sorry that it didn't work but maybe if we find more information we can try again.
 
Ok, I will reinstall R123. Then I will report how It works. Maybe I did something wrong but I don't think so.
We need find a correct schematic.
 
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