Quote from: phatt on February 20, 2024, 08:59:41 PMhi Megatrav,
Wise not to focus on one aspect like Efficiency.
Heck, Valves waste a lot of energy as heat yet they are still considered the holy grail of tone for a lot of guitar players.
There are just so many rabbit holes in this field that are mostly a waste of time.
I have 3 Valve Amps but my main setup is a pedal board which delivers a great sound into an old 70's 80's era Keyboard Amp.
If you research how Valves actually work you will realise that a lot of the magic is due to a very poor Power supply.
Depending on the design With no signal the HT voltage might read 400VDC in a valve amp. Turn up the volume and hit a big power chord hard and that 400V will drop like a brick, You might see it drop by 100V or more, depends on The ability of the PSU design.
As that signal fades away that voltage rises back up.
This is effectively causing compression so the sound level actually drops and limits the absolute SPL and as the Voltage rises back up it gives the impression of more sustain.
But with SS amps the supply voltage is very stiff and hence no magic sustain.
A SS 40 volt supply might only sag 2 or 3 Volts and by then you get into hard clip which is ugly, so hence SS gear gets a bad reputation.
So to recreate that effect with SS gear you will need a compressor.
I do all of that with my pedal board and the Amp just makes it louder.
The Amp adds very little colour to the final sound although it does have a spring Reverb which adds a final touch. I use 3 OD dirt pedals into my Compressor.
the Gain of all 3 dirt pedals are set fairly low and as you turn each one on you get more drive. And the compressor does 2 jobs obviously it adds compression but it also keeps the absolute SPL in a set range so when I play leed parts nothing gets too loud.
I use an optical compressor as they tend to work very well for OD rock guitar sounds.
As for Class D stuff I've noticed that the freq response often goes down way too far and that can be a big problem if you are trying to reproduce the classic sounds.
Understanding and limiting the bandwidth of your gear will help refine your sound.
Too much Low and High freq will just frustrate you and drive you crazy.
There are many ways to great tone and even when you get there you will find that different venues and rooms can give different results. I have built many circuits and thought I had cracked the holy grail only to find that when I played live it sounded like crap.
If it interests you I posted a recording of my gear on here a while back.
This will give you some idea of what can be done with all SS gear.
Regards from an old bloke who has spent lots of time down these rabbit holes, Phil
Quote from: Tassieviking on February 22, 2024, 12:01:47 PMIt is usually a M205 fuse that costs cents, sometimes a ceramic type but still cheap.My meter uses a regular fuse for the 2A range but has a special fuse for the 10A range (that has it's own probe port).
Quote from: phatt on January 13, 2024, 04:34:38 PMJust a note on Digi Amps and SMode supplies.
Ok they are cheap, light weight, and so so convenient.
But keep in mind, Unlike Smode supplies Iron and Copper Transformers have an indefinite life span, if used within spec.
Jezzus Not even god could make a more bullet proof design.
I doubt that in 50 years from now that these SMPS circuits will still be running as they are far more complex and hence far more prone to failure.
Notice how many Dead computer Power boxes fill bins in repair shops.
Now I'm not up to speed on Digi amps but the few I've had the displeasure of working with leaves me thinking that it's hard to beat a basic old school transistor poweramps.
Well designed unit go for years without issue. Of course Can caps dry out eventually but simple to replace.
with most things now surface mounted and hard to work with it's a throw away item. But by then you find out OH sorry they don't make them anymore.
and you are left with land fill.
If it interests you Rod Elliot has a ton of info on Amp design, a lot of which is aimed at muso gear.
I have found him to be very helpful while trying to build Analog Power Amps.