1969/1970 Marshall SuperLead 1959

[Alpesitehen]

What do you think about this amp? I have an another topic just under this one about an 1970 50W JMP. Which one would be the better choice. What do you think about the condition. As far as I know the Power transformer was replaced to an other one from a '72 SLP. Was any capacitors changed before? Transformers? The serial is: SL/A 7204A. Is it from '69 or '70?
How much does it worth approx?

Thanks for your help guys

 

[Matthews Guitars]

It's a '69. Note the circular cover plate over what would be the fourth preamp socket hole. They got rid of that in 1970.

What you have there is basically identical to my '69 Superlead except mine doesn't have the line voltage selector.

That amp's bias caps and filter caps have been replaced but the snubbers are apparently original.

I'd suggest yanking out those white bathtub ceramic screen resistors and installing proper 1K green vitreous Welwyns instead.

Nice amp. Looks like no irreversible changes have been made to it. It's a very good, nearly original example of the type.

 

[AndyD]

The front faceplate , by the switches, looks a bit crinckly. Looks to be pretty original. Do you want a 50w or a 100w?

 

[StuC]

(deleted - misread s/n). PT is definitely later because the wires exit both sides of the core.

 

[Alpesitehen]

The front faceplate , by the switches, looks a bit crinckly. Looks to be pretty original. Do you want a 50w or a 100w?

i prefer the 50W one, but I think It would be cheaper. Or I take both

 

[Seanxk]

If you want to know the exact date, just ask the guy, it's on the label 15-6-xx ( just like the other amp you requested info about ).
Going for an exact date on the Pre amp valve socket plate isn't very definate, but I'm going 1970 not 1969.

Had lots of work on the power valve area, new bases too. New switches also. Red die touchup?.

 

[StuC]

It'll be June '70then. I misread the s/n in the original post.

 

[neikeel]

The 100w has had the output tube sockets replaced with cheaper chinese ceramic octals (the 71 type are available. The screen resistors will do the job, original type would be Welwyns (at least on the 70/71s. I like the bright cap on volume 1 with push-pull switch.
I'll go 1970 as they are using the smaller 220k and 470k Iskras and the cathode resistor is 1k as opposed to 820R with bypass cap.
Both on/off switches replaced, diodes replaced. Decent quality filter cans and bias caps.
The transformer support brackets were junked when the PT was replaced - why?
Overall just service work done, irritants are the cheap octals and why a lazy tech could not be arsed to put the brackets back on properly.

Depends why you are buying and what use you have for them in my world the 50 is more useable, but both will need an attenuator and a decent cab contemporary to the amps to get the best out of them, IMO.

 

[boola1]

Which one would be the better choice.

Do you prefer 50w bass or 100w lead models? They are quite different beasts .

 

[Alpesitehen]

Do you prefer 50w bass or 100w lead models? They are quite different beasts .

As far as I know the other amp is an 1987 which means this is not a bass head.

 

[neikeel]

As far as I know the other amp is an 1987 which means this is not a bass head.

The 50w amp in your pics is a Bass amp Model 1986
The 100w amp is Lead Model 1959

 

[Alpesitehen]

The amp has an 1987 plate on the back. How can I indentify that it is a bass amp?

 

[Spanngitter]

The amp has an 1987 plate on the back. How can I indentify that it is a bass amp?

Easiest way is to look at the
Output Stage Coupling Caps:
1986 (Bass): 0.1uF
1987 (Lead): 0.022uF
Further Differences (just right out of my head)
Tone Stack Treble Cap:
1986 (Bass): 250pf
1987 (Lead): 500pf
Tonestack Slope R
1986 (Bass): 56k
1987 (Lead): 33k

 

[Alpesitehen]

Easiest way is to look at the
Output Stage Coupling Caps:
1986 (Bass): 0.1uF
1987 (Lead): 0.022uF
Further Differences (just right out of my head)
Tone Stack Treble Cap:
1986 (Bass): 250pf
1987 (Lead): 500pf
Tonestack Slope R
1986 (Bass): 56k
1987 (Lead): 33k

And what is your opinion about this amp? I choose the player way instead of just looking at them and enjoying the ownership. If this one will be much cheaper than the other, I think I will choose this because I don't want to ruin an expensive fully original collector condition amp.

 

[boola1]

And what is your opinion about this amp? I choose the player way instead of just looking at them and enjoying the ownership. If this one will be much cheaper than the other, I think I will choose this because I don't want to ruin an expensive fully original collector condition amp.

They are both nearly all original. You need to answer the question whether you want a 50w bass model or a 100w lead model, they are very different amps. We can't answer that one for you.

If the 50w really does have 1987 on the back panel, it's either a mistake or didn't originally come with the amp.

 

[Alpesitehen]

The seller asked 3050 euro for it. I will skip this one I think. The JMP 50 bass amp looks much cleaner for me.

 

[Joshabr1]

It's a '69. Note the circular cover plate over what would be the fourth preamp socket hole. They got rid of that in 1970.

What you have there is basically identical to my '69 Superlead except mine doesn't have the line voltage selector.

That amp's bias caps and filter caps have been replaced but the snubbers are apparently original.

I'd suggest yanking out those white bathtub ceramic screen resistors and installing proper 1K green vitreous Welwyns instead.

Nice amp. Looks like no irreversible changes have been made to it. It's a very good, nearly original example of the type.

I have a early 71 lead amp with that same chassis.

 

[Matthews Guitars]

I suppose they had a few leftovers. Generally those four hole chassis disappeared in mid 1970, but knowing Marshall, I'm not surprised if a few stragglers came out later. They used what they had, when they had it.

 

[TAZIN]

It looks like a July 1970 build to me.