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Ken Bran and Dudley Craven didn't have just one chance to look inside a Bassman - they copied the circuit exactly. Every component value is identical, the only difference is the OT ratio which was because it was an off-the-shelf transformer designed for 16 ohms not 2. Even given that, they did not change the NFB resistor to compensate, with the result that the Marshall has about three times as much and sounds quite different. So I wouldn't give them too much credit for understanding how it worked!
"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
I don't over much like the compressed gain sounds they come out with either.
I tried one the Lonestars when they first came out, but I think I could get better sounds out of a Peavey Bandit and save a fortune in the process.
When you crank one up, it sounds wonderful. See 4:35.
As Icbm said earlier one takes its heritage from BF fenders and one is more Bassman (like I know what that means lol)
I know that Boogies take a great deal of dialling in, and the control settings are very counter intuitive if coming from a Marshall background at least.
My settings on my Boogie are
Gain 7
Bass 1
Mid 2
Treble 7-8
Then there is a post gain 5 band slider eq that I have in a deep V setting.
My eyes tell me this should be all hiss and no middle but its fat, full and strident, the cleans are sparkling and crisp but not biting, the gain channel is absolutely huge sounding and very tight.
Its not a gain sound to bash out jangle pop/rock but for tight aggressive riff driven music it's absolutely ideal.
I dont get the over compressed tag that at that a lot of people hang on Boogie gain tones either?
I have a great deal of gain and even boost the front end with a drive pedal, but the harder I hit the guitar the harder it hits back, I can palm mute and shake the floor or wind the volume back and arpeggiate chords.
In fact it's the perfect amp drive tone.
There are plenty of Fender designed circuits; when Leo owned the company they brought out new amps every year.
In fact most people don't realize just how many amp models Fender developed in the pre-CBS era.
A good example is the tone stack used in virtually every amp since the 60's which was developed by Fender.
The very first TV front Bassman was indeed copied from application notes, but this was very quickly superseded after a couple of years of production, probably because it didn't sound very good.
The 5F6A copied by Marshall is very different from the first Bassman. There were at least 4 up dates of the circuit from the TV front to the 5F6A.
Now, I'm not taking the moral clean signal high ground here, but my route to finding amps I like is basically the clean. If the clean is great, then I can sort everything else and make it dirty.
If it's shite I can't make it sound good clean, and for me, all the sounds I want are in the clean-breakup range (with the occasional drive pedal.)
@jpfamps - I have a book on Fender's amp developments. In the preface it notes the book is 250 pages long and it jokes that if Leo had used all of the prototypes that didn't make it into productiuon, it would have filled those 250 pages alone.
The thing is, when is a circuit a new circuit? Half of Leo's ideas were evolutions rather than revolutions*
(* I'll do it before someone else does- the only amp thing that truly was a revolution was the Vibratone....see, Leslie joke done.)
*An Official Foo-Approved guitarist since Sept 2023.
Leo was an inveterate tinkerer.
Regarding electronic circuits, well they are all generally evolved from previous circuits.
A triode or transistor only has 3 terminals, and so there are a very limited number of ways they can be wired and actually do anything useful, so all electronic circuits (not just valve amps!) have common circuit elements.
If you look at the schematics of the first Bassman and the 5F6A, the 5F6A has clearly evolved a long way from its origins.
Amps live and die by the drive sound for me.
if an amp has a killer drive and a terrible clean I'd prefer that over an 'ok' drive and a stunning clean.
I do use clean tones, but I'd say 90/10 split, so it doesn't make sense to worry about the clean tones so much.
A band I really like, guitarist uses a vintage 70's HiWatt head set Clean with lots of pedals.
Just like Davy G
*An Official Foo-Approved guitarist since Sept 2023.
I think though that Fender and Metal / hard Rock do not really marry up in my head. I think of fender as Clean, pedal platform and Blues.
The overdrive characteristics of an amplifier are the consequence of its clean tone, not the other way around. This also explains why I rarely like the sound of amplifiers developed after 1980.
Rift Amplification
Brackley, Northamptonshire
www.riftamps.co.uk
Singer's voice is the only thing I'm not sure about...
For classic rock it's all about the dirt sound for me, which is why I've always used Marshall's and more recently Blackstars. The cleans aren't great but you tend to use a backed off clean sound from the volume control rather than needing a pristine clean voicing
For everything other that classic rock I prefer Fender cleans backed up with pedals
*An Official Foo-Approved guitarist since Sept 2023.