1974 Marshall Super Lead 1959 Power Transformer original or

[mesanatic]

Hello all, I've been popping in here for awhile and finally registered. I hang on TGP but this seems the forum for more detailed knowledge on the technical aspects of Marshall. My knowledge is less than basic but I still love my Marshalls.

I recently aquired this '74 Super Lead and the PT and Output transformers looked to be about the same age. But when I pulled the chassis the PT wiring looked like nothing I've seen in my Marshalls. Very new look and hardwired to 120v. I'm not sure if just the wiring was replaced or the Power transformer itself. The label is off and there is no stamp on it. I know the power plug is replaced, the front switch and no mains or ohms selectors. But not certain of the different sized pots as I've seen this on a '74 1987. Also some sloppy work on the rectifier diodes as was pointed out to me.
Here are some photos and a link to photos of the entire circuit. Any comments are appreciated. It does sound good though.






http://s680.photobucket.com/albums/vv16 ... b888cf.pbw

[neikeel]

Definitely not original wiring.

The endbells/bracket look original and the core with copper wrap looks very similar to an original.

What does the PT put out? Does the amp perform up to scratch?

[mesanatic]

Thanks, I didn't think it was original. I just got it and haven't tested it or had it tested I should say.

It sounds good compared to my other Marshalls. I have a couple of 2203's that are louder but this one seems to have plenty of power. The PT looks like a Drake and not a new one but it could have been replaced some time ago and/or the bell housings could easily have been used from the original.
It has been hardwired so I'm not sure if a tech replaced just the wiring in the process.

I'm trying to contact the seller about it since he claimed the amp was all original. Not expecting much info though. I'll either return it or get some compensation for the discrepency.

[neikeel]

You can also see where the chassis was cut and drilled for the bulgin to be replaced with a kettle plug type socket. The endbells are of a Dagnall type and the copper wrap suggests that the PT is a Dagnall type replacement, although the gauge and style of the wires suggest it is probably an after market replacement - but maybe of good quality so if you can get the price down (you will not have bought it as a collectors item as I am sure that you noticed the plug change

[mesanatic]

Yes I noticed the plug change and the front power switch. Also the pots are of different sizes and wasn't sure if that was common or not. I did see another '74 but a 1987 model 50w and it also had the presence, treble and mid pots smaller with fastening nuts in front of the front panel.
I have many photos here.
http://s680.photobucket.com/albums/vv16 ... b888cf.pbw" onclick="window.open(this.href);return false;

At least the Mustards on the board are intact.

[neikeel]

Wow, lot of pics

Not too much wrong there really.

looks more like some of the knobs need sliding down a little.

Marshall did use odd sized type of pots, just what they had.

they used the big 1meg pots from the mid 60's until later than the other values (not yours but just as an example).

Loom just needs tidying up (you could haggle).

In fact it looks like a laydown type replacement PT but fitted in the original stand up bells.

[mesanatic]

I did take a few pics. I was trying to get a good angle on the input jacks. There doesn't seem to be any difference between the Treble and Bass inputs. And very little between the High and Low of each side.
The amp stays very articulate even cranked to 10.
Only a slight hiss from the speaker cab too . No other noise. Pretty good for this amp.
I emailed the seller and I'm waiting to hear back. Maybe I'll find a '69-'72 untouched in the meantime for under $1000 too. Well I can dream, right.
Thank you for your help Neikeel.

Laydown in standup bells. Now that is interesting. What tells you that. I don't know what to look for to be honest.

[neikeel]

Laydown in standup bells. Now that is interesting. What tells you that. I don't know what to look for to be honest.

All the wires exit one end bell. The far chassis hole and end bell do not have wires coming through them - usually have the wires split like this:

http://www.marstran.com/164.htm

and not like this (ie like yours)

http://www.marstran.com/T2562.htm

Ignore the numbers and designation of the trannies this is just an example of style.

[mesanatic]

I see, thanks, Yes my pow er transformer has two holes on one side with a set of wires coming out of each.