I played one at the store that has entrusted me with deciding if amps are really dead or not.
The thing sounds amazing (dirty channel only, no idea what clean sounds like) with the volume barely cracked. Once it is loud enough to have to raise your voice to talk over the magic is completely gone. None. Nil. Null. Numb. Any insights there? As the volume goes up the amp starts getting clean on a short curve (1.5-3 on the dial) and just gets worse.
What a great distortion unit. Best ever. Super sweet. Short tone control changes give up a very wide range of great tones
I have a MkI scheme here. My amps are scared because they know I have fresh solder and an evil bent on change I can believe in.
It's a 4 stage plate drive. Yes, SOB turns into a SF Twin the higher the MV goes. I just edited everything but the dirty channel from the schematic. I think I have all the stuff to test this except for an empty 50w chassis.
Ganged 1M for gain control.
Considering making one of those empty 50w chassis before the Sun finishes setting. I have a torch. LOL
Weird, can't say I've ever experienced that problem before. You're dealing with the 4x6V6 model? I'd be curious to know what's going on with NFB switching. Are you working with this schem?
I don't think the PI is helping it stay together. It would be better as the common Marshall or that 'other' one that responds similarly but a bit more open. Set it up for driving EL34s and open up the bias range so I can make 6v6 work with (gasp!!) a GrenadeZ34.
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Reeltarded wrote:C22 has open circuit. WTH is that? Off the top of the 1000p coupler stage 1.
No idea, I mean we all know why it would be there, just not why it would kinda be there. Maybe they only connect it on misbehaving amps in the testing stage. That seems really stupid though.
Well, you see there is this alternate dimension, where guitarists have to use attenuators to get cleans. They bitch about the fact they can only get dirty tones in their bedrooms. This is a place where "brown sound" means poopy, where they complain about sustain, where everyone wants a Yeleek Expander. A dimension of sound, a dimension of sight, a dimension of mind. You're moving into a land of both shadow and substance, of things and ideas. You've just crossed over into... the Twilight Zone.
I swapped out the second tube socket earlier. Trying to play without having to remove the board and build a new one. We shall know in the next couple days if this blend will stand up to the line or not. My early voltages are going to be all wrong but that is the hotrod ethos. Yay!
This poor Marshall has enough holes to fill The Albert Hahahahahahahaaaaaaall.
Ok. I got it. Added isolation resistance from TS to Master. Action! Need to dial that in a bit. It's a trimmer. My ears and eyes are crossed. Should I make that smaller or larger? I measured it last around 130k and it seemed to be doing well but it is Sunday night and clear as a bell outside. Not enough humidity to crank without disturbing the hood. On 2+ a teeny it sounded like it was getting more amazing. I might be happy to have turned off the iron though.
My values are all wonky because all I did was pile up everything on the socket or fly it over to replace the V2 stuff leaving the V1 values and my previous mixer scheme just to test. Swapping the gain pot was a bummer.
It looks like a bomb hit a vintage electronics factory.
I have pres and res but the res needs to go down lower. 4n7 to.. I need it below range just to punch the air down there. What about 2n2? Any suggestions about that and the master isolation? Maybe it's time to pull out t3h decade resistor thingy. (Tips hat @ The Bastard)
Oh crap. I think I will plug the damned iron back in... help me..
I'm not just saying this, but I like 3n3 for the resonance control. 4n7 is more felt than heard, and 2n2 is too much low mids for some guitars and muddies the cleans too much.
I think the reactive tone controls are two-fold: plate-driven is more lossy so more range, and the 500KA bass pot doesn't give up all the goods before noon like the ubiquitous 1MA. It's funny, I see a lot of high gain 'modern' amps have adopted the 500KA bass pot, and I assume so for this very reason. This way you can add more bass too, and the amp seems both less woofy at the 'high noon' setting, but to have more bass on tap because you can actually hear an increase when the control is turned to 6, 7, 8... Of course you lose the maximum bass a 1MA would have, but I can't personally tell with the Marshall stack.
I think I have a couple of those. I'll try it tomorrow. Oh wait. It is tomorrow.
If I make a loud noise, say a gun goes off in the back yard.. or something, is it appropriate to play very loud for 5 minutes if the neighbor's lights come on?
I agree on the 500k thing. I wish there was a simple addition to peak the bass response over a shorter range but leave everything else. The response is a little loose.
I have a torch. LOL
