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Marshall Lead 12 schematic needed.
Marshall Lead 12 schematic needed.
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Old 18th May 2018, 06:02 PM   #1
DrFireBottle is offline DrFireBottle  Montenegro
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Default Marshall Lead 12 schematic needed.

Hi all...


I would need an Lead 12 schematic, or something similar that uses transistors and sounds similar and puts out 12W...

Last edited by DrFireBottle; 18th May 2018 at 06:07 PM.
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Old 18th May 2018, 06:18 PM   #2
Printer2 is offline Printer2  Canada
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Second listing when Googling 'Marshall Lead 12 schematic'.

Marshall Lead 12 schematic - Google Search
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Old 18th May 2018, 08:02 PM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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This is a particularly awful design. It may take some fiddling to get it to work if you are planning on building it. Make sure TR4 is mounted on the heatsink!
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Old 20th May 2018, 03:05 AM   #4
Printer2 is offline Printer2  Canada
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Well that is a surprise, T0-3 transistors. Looking at the schematic I first thought a simple brute force way of insuring the outputs live (no protection circuit) and then I thought maybe they went with as smaller case style. Today someone posted the gut shot of their amp, now we know.
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Old 20th May 2018, 09:09 AM   #5
DrFireBottle is offline DrFireBottle  Montenegro
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Quote:
Originally Posted by Printer2 View Post
Second listing when Googling 'Marshall Lead 12 schematic'.
Marshall Lead 12 schematic - Google Search
Lead 12.gif
This one?
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Old 20th May 2018, 02:47 PM   #6
Printer2 is offline Printer2  Canada
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Yes.
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Old 21st May 2018, 01:56 PM   #7
JMFahey is offline JMFahey  Argentina
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"Awful" ????????
It´s a KILLER amplifier, very well regarded and used by some of the best Guitar Players in the World, including ZZ Top.

I guess way back then Marshall had a truckload of transistors, bought all Factory surplus, got a HEAVY discount, whatever, because they used that particular pair (MJ2501/MJ3001) and which usually is somewhat expensive, *everywhere* , from 50/100W amplifiers (where they are justified) to 12W ones such as this one where they are way overkill.

Very expensive or hard to find today, I suggest you use plastic TIP142/147 instead, mounted on a conventional heatsink instead of that "spider" type one and, yes, mount T4 in contact with heatsink or plain epoxy it there.

Sound is killer and it deserves good speakers:

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Old 23rd May 2018, 08:17 PM   #8
DrFireBottle is offline DrFireBottle  Montenegro
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Agreed!
And also, Johan Segeborn records amps like no other man, just an amazing player who knows how to demo something.
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Old 24th May 2018, 01:41 AM   #9
Printer2 is offline Printer2  Canada
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Let's go.
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Old 1st September 2018, 07:38 PM   #10
DrFireBottle is offline DrFireBottle  Montenegro
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Hey guys, I know it has been a while, 'cause i had a lot of tube stuff to fix and build and I decided to revive this topic because I got 3 small boxes full of various components from the 70's (leftovers form yugoslavian factory near my town) boxes have a lot of small transistors, but there are bigger ones like RCA7905, and because of my poor transistor/regulator/solid state knowledge I wanted to ask could they be used as power transistors in Lead 12 and what are they actually?
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