Does this look legit? Marshall Experts needed.

[BesaMoogie]

Hi guys,
I am able to buy a Marshall 4102 combo for a good price. It`s the 2204 circuit from 1982. Only question I have, if it looks ok and I should jump for it? Seller says that the pots were changed. Apart from that, it is in original condition. Maybe some of you experts can have a look on the amp?
Thanks

 

[dcburn]

Looks good to me.
But I'm just here admiring all the free space inside that chassis!

 

[BesaMoogie]

Looks good to me.
But I'm just here admiring all the free space inside that chassis!

Perfect place for a cupholder

 

[dcburn]

Perfect place for a cupholder

I look into my 18 watt and there isnt room to poke your finger in there.
Yours has so much, extra gain stage time? lol
Add a zero loop?

 

[fusedbrain]

Looks good to me overall. Changed tone pot is the only "mod" I can see. No big deal.
I don't see any 1k screen grid resistors on the power tube sockets, so I would think about adding those.
Also, for the other Marshall guys: is that ceramic cap on the mid pot something Marshall put in the combos? Seem to remember something like that, but not sure.

 

[burger]

Looks very clean. Even still has the cap on the mid pot which was added for the combos, not present in the 2204 head.

 

[BesaMoogie]

Looks good to me overall. Changed tone pot is the only "mod" I can see. No big deal.
I don't see any 1k screen grid resistors on the power tube sockets, so I would think about adding those.
Also, for the other Marshall guys: is that ceramic cap on the mid pot something Marshall put in the combos? Seem to remember something like that, but not sure.

Yes. Maybe I will convert it to a head, so one of the legs will be detached.

 

[fusedbrain]

Looks very clean. Even still has the cap on the mid pot which was added for the combos, not present in the 2204 head.

Ok, so there you go.....

 

[Bxlxaxkxe]

Ok, so there you go.....

I had the 4010 which is the same amp in a smaller chassis and 1x12 combo. I did end up snipping the mid cap. How much of a difference it made is debatable but I was sure I liked it better without

 

[mixn4him]

Looks like the bright cap on the gain pot has been clipped, easy to reattach if you want it…

 

[DanTravis62]

Bright cap clipped it looks like, looks legit to me

 

[burger]

Bright cap clipped it looks like, looks legit to me

Nice find. You gotta reattach that man.

 

[Racerxrated]

Nice find. You gotta reattach that man.

THIS. Easy enough to do; I'll never understand guys that clip them in these and NMV Marshalls. Neuters the amp IMO. In the MV Marshalls its a pretty small ceramic; not sure of the value? My 72 has a 5K Lemco.

 

[Devin]

Looks good to me.
But I'm just here admiring all the free space inside that chassis!

You could hide your drugs in there

 

[RedPlated]

That’s an amp modder’s dream. Look at all that space inside. The things I would do to that…. (don’t tell Jason. A part of him dies when I send him pics of me drilling holes in an 800 or JMP).

It seems the lower plate voltage amps delete the screen resistors. The last one I saw like that had 390vdc B+. It’d be interesting to see if this is a low plate voltage amp.

 

[Fusionbear]

Looks like the output transformer was replaced.

Can you take some pics of the transformer code?

But, yes, it looks great overall...

 

[BesaMoogie]

THIS. Easy enough to do; I'll never understand guys that clip them in these and NMV Marshalls. Neuters the amp IMO. In the MV Marshalls its a pretty small ceramic; not sure of the value? My 72 has a 5K Lemco.

Do you know what the standard bright cap in a MV is and if they changed over time, like JMP 220X vs JCM800?

 

[BesaMoogie]

That’s an amp modder’s dream. Look at all that space inside. The things I would do to that…. (don’t tell Jason. A part of him dies when I send him pics of me drilling holes in an 800 or JMP).

It seems the lower plate voltage amps delete the screen resistors. The last one I saw like that had 390vdc B+. It’d be interesting to see if this is a low plate voltage amp.

Will check that but it will take some time as I am going on holiday after picking it up

 

[Racerxrated]

Do you know what the standard bright cap in a MV is and if they changed over time, like JMP 220X vs JCM800?

I don't; I tried that mod years ago (lifting 1 leg of the cap) and after trying it, immediately soldered it back. It's a small cap though, going off memory. Someone here or in the Tech sub forum could tell you.

 

[BesaMoogie]

Looks like the output transformer was replaced.

Can you take some pics of the transformer code?

But, yes, it looks great overall...

I was thinking of that too, but then I`ve found other examples of 4101 combos (see the picture) and the transformers look as new as the ones of this amp. The Drake-stickers are hidden on the sides, but at least the mounting screws are looking the same.