I was just wondering if and when I need to changes the tubes in my 2525 mini silver jubilee head can i just put the same type tubes in it or does it need to be biased?

Hi all! It's a good day to be a Marshall owner!!
I have 2 questions , I have been using my model 4120 through a cheaper model Marshall Cab a G412C and I have to say all this time I thought it was a 1960 B. Well I bought a 1960 B and now notice the difference, in my defese the cabs look identical and the G412 was bought used and the Marshall Logo on front and tab in the lower left corner was never there when I bought it. I do notice that the 1960 is 300 watt at 16 and the G412 is 120 at 8 can I run both cabs through my model 4120 Dual Reverb head and also what is the high low switch on the back of the 4120?
Thanks yall and I appreciate your "input" ( see what I did there? )
Tony Wilson

I have a vintage Marshall amp that I love. Is it possible to use a headphone set with this amp? If so, how! 

Thanks

Tried to update my firmware and tried three cables. None are even recognizing the amp on multiple computers. Tried to reset the settings on the amp and nothing helped. It seems as if the USB port is not working at all.

I have a 70's JCM 50 W lead I want to replace the tubes - 2 x 6550 and 3 x 12 ax7 ecc83, original GE tubes are in the amp. I am told I need to repalce the power tubes due to the 3 amp fuse keeps blowing. 

I am able to connect my phone to the amp via bluetooth, but for the most part am not able to sync the presets in the gateway app to the amp.  On occasion it will do it, but most often not.  The tuner and playback work fine.

i dont know the code

Can you factory rest all the Code 50 pre-sets, and if so, how?

Can the CODE series amps be accessed via laptop? Or is Gateway for iOS and Anroid use only?

I have a 50w Mk2 Lead amp serial number 6232H    

I was curious as to what year it was issued?

I can download and run the firmware updater on my Win 10 laptop - it then asks me to connect my CODE 25 amp. I connect the amp using a USB cable - then I see the message "An error occurred: An error occurred getting the device information from your CODE. Please try switching your amp off, and then switching it back on again."

I switch it off and on - no good. Same problem. I connect the CODE amp before running the firmware utility - same result. So I don't even know what firmware is currently in there. Is this solvable? BTW - the USB cable works, as my Marshall CODE Live Editor has connected to the amp using it.

Thx

Hi, I have just taken receipt of a MG102cfx.  Could you please help me with some suggestions for Rock, Blues & Metal settings please? .  I'm still kind of new to these amps and really want to discover what they are capable of.  Thanks inanticipation.

Ive seen 2 diferent presets on preset 00.  Mine has EL 34 Heaven and some has Screamer that has a Boston-style sound.  Are there two versions of the Code 50 amp?

Is there a reset sequence on the Code 50 amps?

Does Marshall make a 3 button foot switch for a DSL100H?

Hi- I have owned an AVT50 from new. The footpedal no longer switches to overdrive and while the switch on the amp still works the red overdrive light does not come on. I live in south east London; where is the nearest place I can get this fixed?

I would Like to play this amp before I buy it but none of the local guitar stores in the Tampa Florida area seam to have it could you recommend someone else please and also is this amp a good blues amp

Thank You

how do I notice my preamp valves need to be changed?

thanks you! :)

can you provide me with a history of my jcm 900 4501 amps

what year was it built?

where was it built?

Hello...I have a JCM 800 2203 that I purchased back in 1981 and I wanted to replace all the tubes in the head after all these years. My amp has many hundreds of hours on it between practice and hundreds of gigs back all through the 80's.  I assumed that I had the standard compliment of Four EL84's in the output stage of the head...Everything I've read stated as such, and all the You Tube Bias Procedures led me down the same path....SO I ordered a matched set of TAD 12AX7's (3),  and four EL34's. Well, much to my suprise, when I took the back metel cover off the head, I did not find four EL34's...What was installed for power tubes back in 1981 was 2- 6550's, and 2- 6L6's. Both larger than the EL84's. Can anyone tell me why they (Marshall corp.) would do this...is there any special reason? I DO NOT want to change ANYTHING about the tonal characteristics of this amp. I would sure like a little enlightenment on the what's and the why's. I am truly facinated at discovering this..Thaks to all...Randy