Marshall DSL 401 packed up

[XXXX]

Any help much appreciated. I have a Marshall DSL 401 amp that no longer
produces any sound. It was working fine and then one time I switched it on
and got zilch. The power light is on but the valves don't light up. Both
fuses seem OK.

[Tony Hwang]

Post by XXXX
Any help much appreciated. I have a Marshall DSL 401 amp that no longer
produces any sound. It was working fine and then one time I switched it on
and got zilch. The power light is on but the valves don't light up. Both
fuses seem OK.

Hi,
Better check the fuses with meter or just replace them to be sure.
Visual is some times misleading. You mean all tubes are out?
Tony

[Dlr6971]

Post by XXXX
Any help much appreciated. I have a Marshall DSL 401 amp that no longer
produces any sound. It was working fine and then one time I switched it on
and got zilch. The power light is on but the valves don't light up. Both
fuses seem OK.

Sounds (or lack thereof...) exactly like my TSL 602. I asked the same question
on here earlier. Someone said "bad soldering on the rectifier", it melts in
the heat, or something. That's a job for someone more adept than me, so off it
goes to the shop.

Does your amp still give the "pop" sound of cold tubes when you switch out of
standby mode? Mine does, but that's the only sound it makes.

[Chris]

Post by Dlr6971

Post by XXXX
Any help much appreciated. I have a Marshall DSL 401 amp that no longer
produces any sound. It was working fine and then one time I switched it on
and got zilch. The power light is on but the valves don't light up. Both
fuses seem OK.

Sounds (or lack thereof...) exactly like my TSL 602. I asked the same question
on here earlier. Someone said "bad soldering on the rectifier", it melts in
the heat, or something. That's a job for someone more adept than me, so off it
goes to the shop.
Does your amp still give the "pop" sound of cold tubes when you switch out of
standby mode? Mine does, but that's the only sound it makes.

Cliff notes: Perhaps you fried your pre-amp tubes. Perhaps you might
want to try to eplace 'em and see (?)

Long story: I read, or what told (can't remember), that after you shut
your tube amp off, to turn the standby switch back on to bleed the
charge left in the power section (again, if I remember correctly). So, I
started doing this.

Can you tell where this is going yet?

Next gig, I plugged my amp in where both pwr and stnby were on -- FRIED!

New pre-amp tubes.

I no longer bleed the tubes. Fried tubes are no tubes LOL

[Tony Novacheck]

Post by XXXX
Any help much appreciated. I have a Marshall DSL 401 amp that no longer
produces any sound. It was working fine and then one time I switched it on
and got zilch. The power light is on but the valves don't light up. Both
fuses seem OK.

Probably bad solder joint at the rectifier. Common problem to DSL's and TSL's.


Lostpup198

"We will all be better citizens when voting records of our Congressmen are
followed as carefully as scores of pro-football games."

-- Lou Erickson

[Gilbert Bates]

Post by Tony Novacheck

Post by XXXX
Any help much appreciated. I have a Marshall DSL 401 amp that no longer
produces any sound. It was working fine and then one time I switched it on
and got zilch. The power light is on but the valves don't light up. Both
fuses seem OK.

Probably bad solder joint at the rectifier. Common problem to DSL's and TSL's.

Yep, and it'll be your preamp tubes that won't be lighting up. I've
done a few of these amps for this problem. You'd have to pull the
circuit board and flip it over. It can be done without pulling any
wires off the board as I recall. But if you don't have any clue as to
what I'm talking about then take it to somebody.