billyz wrote:Fischerman,
I do prefer the 12at7 PI . and I have found that I like the Tail resistor at around 22k. 10k works well too. But I seem to hear something sweeter with the 22k. the 12at7 definitely fattens and darkens the tone.
Billy
What value of NFB resistor are you using. I changed mine to 68k and this helped to clean things up a bit. Originally if I just cracked the vol pot at one I had breakup and now I can get all the way to 3 or 4 before distortion starts. Just wondered what affect that might have on he 12at7 in the PI spot.
I have experimented with lower values NFB resistors, even with a soul control, I find I always want the lowest NFB . It does clean things up, but. Lower values make it more constricted sounding. You should know , my favorite amps usually have no NFB. Season to taste, every one has a different sound in their head. I like it rare to almost raw with heat.
billyz wrote:I have experimented with lower values NFB resistors, even with a soul control, I find I always want the lowest NFB . It does clean things up, but. Lower values make it more constricted sounding. You should know , my favorite amps usually have no NFB. Season to taste, every one has a different sound in their head. I like it rare to almost raw with heat.
So if I understand you, you're running a 12at7 with no NFB. Is that correct?
To get clean, I train my clients to use the volume control on their guitar and lighten the pick attack. Most seem to get it and like it. I also use a variation of the split plate load circuit for those who want more clean. And or you can use a 5751 in V2 or even V1, i like it better in V2. I always go back to a 12ax7 in V1 and V2.
I'm thinking about building a 15W Liverpool combo and I was curious about the chassis you used in this build. I was thinking about using aluminum channel from here:
I'm thinking about building a 15W Liverpool combo and I was curious about the chassis you used in this build. I was thinking about using aluminum channel from here:
Dana...
Is there any particular technical reason for orienting the chassis that way, with the controls top rear, instead of front - top as usual?
I'm seriously thinking about the sacrilege of a wreck combo..Rocket or Liverpool...
Mainly because a combo is easier to drag around..two boxes instead of one...?
Aurora wrote:Dana...
Is there any particular technical reason for orienting the chassis that way, with the controls top rear, instead of front - top as usual?
I'm seriously thinking about the sacrilege of a wreck combo..Rocket or Liverpool...
Mainly because a combo is easier to drag around..two boxes instead of one...?
Sorry it took me a month to answer this question, but I just now saw it for the first time. I used this chassis setup because I already had the Marshall Style 2x12 combo cabs and wanted to use the same chassis that fits the cab.
As far as sacrilege is concerned , I say go for it.
Dana is this the same chassis that is used in the Marshall 45/100 build and you just need to add the cast ends? If it is I may need to order one more chassis.
Mark
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M Fowler wrote:Dana is this the same chassis that is used in the Marshall 45/100 build and you just need to add the cast ends? If it is I may need to order one more chassis.
Mark
I have no idea. What are the dimensions of that chassis?
oNot sure on the dimensions, but this is an amp that Metropouls puts out and he had a group building going on as well. It is replicated from his original 1966 Marshall 45/100 amp. The kit amp uses a different stamped and folded end chassis but his production amp he using the cast ends.
I have been working on an Express combo for a few months now...actually my trusty amp tech is doing the electronics build with an Allyn chassis while I am constructing the 1x12 cab out of flame maple (all edges are box jointed, dimensions match my Bad Cat Hot Cat 30). The face plate is a 3mm piece of polished copper that I had the local trophy shop engrave the lettering in. I then filled the engraving with .925 silver. I found 3 NOS early 80's Celestions in a friends basement so that is the current speaker of choice. The amp is nearing completion soon...I will post photos as soon as the cab is more complete.
I used this chassis setup because I already had the Marshall Style 2x12 combo cabs and wanted to use the same chassis that fits the cab.