Since purchase amp always had a hum unless I touched strings.  Last month the amp spiked when I turned Standby ON.  Since then lost power on Classic channel and selector switch on head would not change channel, but footpedal works.  I returned to Sweetwater for repair/replacement immediately.  I received back stating "Reverb PCBA pins were lifted halfway off Main, glued in place.  Bias the output tubes...".  At this time I purchased Gibson cables CAB12-BL thinking the hum from bad Sweetwater cables supplied.  Still have hum at 1/4 volume, min Gain setting and the Channel Select on head still does not work.  It used to, and hum acceptable at low volume.  Is this correct, can I get replacement?

Hi, I bought a Marshall DSL40C amp in July from Gearnuts (www.gearnuts.com).  The amp has been working great until yesterday - a crackling buzz began and then I heard a pop and saw a small flash of light.  It looks like the tubes are blown out.  How do I get these replaced under the warranty?

Thank you,

Sean

Hi, what brand and model are the best replacement tubes for the jvm410c? I would like to have some alternatives to winged c el34 tubes?

Best Regards

Hi, I have a JCM-800 all original and assume is 2013 made, the serial number is M-2013-05-0216-1, I like to know what brand and kind of transformer was installed in this specific amp, and if is able to support kt-88´s tubes?

Hello everybody.

I just have one quick and easy question: can I sweep a couple of KT66 power tube instead of its original 5881 in my JTM45 2255 reissue head?

any risk or anything to set?

thank you all in  advance 

kind regards

Claudio "Klide" Bauducco

My JVM 410C doesnt have any volume coming from the channels.

One switch works green yelow, not red.  Works fine with switch two.  Switch three works green and yellow, not red.

switch four doesn't work at all. 

No sound out of these channels without footswitch.  Same results.  Now, making a poping noise when turned off.  I just got htis amp in June.  Played a few weeks and then boom, nothing.

I tried using the FX Loop in back.  That's when this whole thing started.  As I correctly plugged in as instructions say, it immediately didn't make sound in these channels.  Unplugged, guitar going straight in, same stuff.  No volume through these channels.

The tubes are red, all glowing.

I need help.  Thanks.

Just purchased this amp. I am a little suprised at how hot the metal faceplate on the control panel gets during use.  I know tubes generate heat and the DSL40 has the four pre-amp tubes just behing that faceplate. Still, just wondering if this is "normal". This is occurring even in low power mode, at relatively low volumes (set at 2 or below) and the Ultra Gain at about three quarters.

What the stock original preamp tubes of this head?

Thanks

Hi, I've just bought a DSL5C combo that sounds fabulous.

Just to know when I will have to make tubes replacement, can you tell me:

• - if the 12bh7 power tube needs a bias adjustment when replaced ?
• - if the ECC83 preamp tubes need to be balanced ones or not ?

Thanks

My JCM 900 doesn't sound the same as it use to, had a local tech. put in a new transformer and tubes but, no balls. How do you find a trained Marshall service rep. in the states?

HI just got  a new (3 days old) JVM 205C and played it a couple of times then when I went to turn it on again it will not make a sound!

It starts and all the tubes light up but when you turn off the standby nothing happens and no sound at all comes out, not a click as if the standby swith is doing nothing.

I did read the manual about the FX loop button muting the amp without effects plugged in but I have tried everything I can think of so far, guitars, leads other power sockets but no go!

Anybody have any ideas???

Thanks

Mark