Hi all...
I would need an Lead 12 schematic, or something similar that uses transistors and sounds similar and puts out 12W...
I would need an Lead 12 schematic, or something similar that uses transistors and sounds similar and puts out 12W...
Last edited:
Second listing when Googling 'Marshall Lead 12 schematic'.
Marshall Lead 12 schematic - Google Search
Marshall Lead 12 schematic - Google Search
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!
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.
Attachments
"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:
YouTube
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:
YouTube
Agreed!
And also, Johan Segeborn records amps like no other man, just an amazing player who knows how to demo something.
And also, Johan Segeborn records amps like no other man, just an amazing player who knows how to demo something.
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?
We can't say. We can't see your boxes from here. "Like" something else says nothing (they could put anything in a transistor case).
What are the part numbers? Run them past Google, maybe you can find some data. (Yes, Russian letters can be hard to search.)
I had one of these for a while. They are neither terrible or awesome. They do have the ‘marshall’ sound in spades but lack bass and the treble is almost impossible to dial out.
Better with external speakers but as with many solid state amps, sounds ace to begin with but after a little while tends to be a bit tedious on the ears and the tweaking begins... found this too with a Yamaha g100 2x10 great reverb though. Compared to a more recent amp like the peavy envoy 110 which does a nice tubey thing or even a Marshall Valvestate 8040 (with a tube) it’s mane be “better” but probably no better than your favourite pedal of that flavour. Still historically for the time it may well have been the beez-neez.
Guess we may think that of a Kemper down the track too.
The best solid state (practice) amp that I have found so far is a Yamaha thr5. Probably not the best equivalent to the lead 12 but sets a standard none the less.
Recon that a 10” stereo version between 15-30 Watts would be a killer grab and go amp especially if it comes with a foot pedal / presets or app for a phone to load or save them.
Better with external speakers but as with many solid state amps, sounds ace to begin with but after a little while tends to be a bit tedious on the ears and the tweaking begins... found this too with a Yamaha g100 2x10 great reverb though. Compared to a more recent amp like the peavy envoy 110 which does a nice tubey thing or even a Marshall Valvestate 8040 (with a tube) it’s mane be “better” but probably no better than your favourite pedal of that flavour. Still historically for the time it may well have been the beez-neez.
Guess we may think that of a Kemper down the track too.
The best solid state (practice) amp that I have found so far is a Yamaha thr5. Probably not the best equivalent to the lead 12 but sets a standard none the less.
Recon that a 10” stereo version between 15-30 Watts would be a killer grab and go amp especially if it comes with a foot pedal / presets or app for a phone to load or save them.
I think I will finish this amp in three months, because another tube project appeared, which is also, more important, but more about that in another topic.
Every time I get one of those amps I gut it and build a single ended el84 amp into it.
Pure AC-DC tone.
See AX84.com for a schematic.
Pure AC-DC tone.
See AX84.com for a schematic.
Yeah I know... I built 3 of those EL84 amps, but with ECC88(6N1-P) instead of ECC83 and few other tube amps, but I need to learn more about the transistor because I know very little about them and how do they work etc.
- Status
- Not open for further replies.