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Marshall then copied the 5F6-A circuit *exactly*, but they made a critical change - because they couldn't spec their own transformers, they bought what was available off the shelf… the OT was for a 16-ohm output rather than the Bassman's 2-ohm. This matters because the negative feedback is driven from the speaker tap, so as a result the JTM45 has over three times the NFB (square root of 16/2)… and is why I think they didn't really know what they were doing, because someone who did would have changed the NFB resistor value to give the same NFB ratio! So the crunchier, more solid overdrive tone of the Marshall is a happy accident really - as well as being added to by using 12" Celestions in a closed cabinet rather than 10" Jensens in an open one.
The next thing they did was to add tremolo to it and make the Bluesbreaker, but it's a very crude circuit really and doesn't work anywhere near as well as the classic Fender tremolo.
Then the 100-watters, which are just doubled-up JTM45s really - and the 50s which are just slightly evolved ones with EL34s and then solid-state rectifiers, nothing that different circuit-wise, although they were beginning to sound different.
They also copied the Watkins Dominator to make their 18-watter, increasing the voltages and using better speakers so again it sounds crunchier and more powerful.
But their first original design was the 200W 'Pig'. This was not a success…
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Bean counters. That, or they weigh up odds - if a cheap, shitty part breaks on 5 percent of the sales before warranty expires, does it make enough money back to be more profit than speccing everything up and having 1 percent break?
http://www.guitarguitar.co.uk/electric_amps_detail.asp?stock=15051811361216
At the same time, this landed on my YouTube feed...
im worried people might hear the notes.
Definitely would like to play through one to form my own opinion. In fact, I'd really like to hear the 2-channel blue head through something that isn't an open back 1x12 - wonder what it'd sound like through a closed back decent sized cab...
Bandcamp
Spotify, Apple et al
FWIW the only Marshall I've ever been impressed by was an old Bluesbreaker.
Never been able to get a clean sound I liked from any other Marshall.