JCDenton6":2ppw2d0w said:
jd267, I'd say register and post this on the sloclone forum, lots of 5150 mod topics posted there.
Try the Peavey forum as well, I came across a few threads there in the past on mod subjects.
sloclone is up, but you cant register on the boards for some reason.
the peavey forum is a good spot to glean info. enzo knows his shit. listen to that guy.
gtrwun":2ppw2d0w said:
jd267":2ppw2d0w said:
sjk":2ppw2d0w said:
jd267":2ppw2d0w said:
d1469d":2ppw2d0w said:
I have a 5150 and it gets tons of low end. I like running a lot of low end also. Perhaps you are looking to reshape the low end not add more low end?
No I'm looking to add a little more low end. Running a lps in the inverter helped out a lot so far. Some people never owned other amps besides the 5150 and hold it on a mantle as the best amp in the wold . I have owned amps with a ton more gain and low end so just trying to make it more to my liking that's all. Only paid 100 bucks for it any how. This is like my fifth 5150 lol
You will find people here have owned just about every amp known to man and you talk like other amps having even more gain than a 5150 is a good thing
I can assure you an amp with more gain than a 5150 would just sound like shit anyway
The most brutally heavy metal can be played on a 5150 with the gain only at 12 oclock!
But really maybe try to find a really good cheap boost that does not cut your lows like the one you made. That would likely solve your problem!
To be honest I have owned like every amp known to man lol. The 5150 is the least of my favorite . My custom boost has a bass boost mod. That's not the problem trust me. Guys if you don't have any no how to do these mods keep your comments to your selfs and kick rocks . Tired of the stupid comments and insults . Just shows who the clowns are.
If you'd spend a bit more time hanging around here getting to know people, you'd know that we arent that serious a crowd and many of these comments are tongue firmly planted in cheek. The other thing i'd point out to you, and again you would know this if you spent some more time here, is that rig-talk isnt really a great source for mod/tech info. There are a few guys here who have a lot of knowledge, but for the most part, this isnt like at Metro where people get into the technical side of modding amps. Ive seldom seen schems or layouts posted here. You started this thread and pushed pretty hard when you didnt get the answers you wanted quickly enough.
you're not really going to find a TON of 5150 mod info online...but with some digging, you can kind of get ideas. i was able to glean information from other amp mods and apply them to my 5150.....and after 3 years of research, trial and error, and some direction from specific people, i was able to figure out a ton of mods for my 5150 script logo that i incorporated
I added the following:
hi focus knob (or hi mid sweep)
low sweep knob (the standard fja mid sweep with a twist)
modded the resonance and presence circuits. each are on a 3 way switch.
tightened the overall bass in the amp to be less flubby. this requires some replacement of coupling capacitors in the preamp section. the higher the value, the more bass you let through. the lower, the tighter it gets. i opted for lower and tighter. these are one of the two PERMANENT mods i did to my 5150. all my other mods are on push pulls and can reflect stock settings.
adjusted the low end in the rhythm channel to be cleaner sounding, and more responsive feeling (this is the cameron c26 and c15 mods shared right on this very site)
tightened the overall amp gain to be less "knob on 5 is full blast gain" and more responsive throughout the dial.
noise/hiss reduction
compression mod (referred to on this site as the r101 mod on a different thread)
presence fat mod
replace the mid pot with 25k linear (stock is 50k audio)
bias mod
separate tube bias test points
and some other secret sauce mods i figured out on my own that are switchable and change the voicing a bit.
i wont give you the keys to the city, but im willing to help.
you're asking about more bass...my amp EVEN NOW has TONS of bass...like, enought that it will flub out my h100 celestions at higher volumes in my 4x12 boxes....i'm thinking you might need to check all the screen grid resistors again and make sure you're getting full power. just to check while you're in there, wont be too hard to see if they're 100ohms. i'd strongly suggest replacing them all with 480ohm or even 1k5watters while you have it open (i put 1k5w in mine).
if you're not willing to look at your power tubes or the screen grid resistors and insist cause they're "new" or "this or that brand" then so be it, i'll move on. it might be worth a try just for shits and giggles to throw a KNOWN working quad of output tubes that achieve the tonal results you're looking for in a different amp, into your 5150 just to see. again...5150 with not enough bass...??? not tight enough, sure, i can see that. not the frequencies you want..again, sure....but not enough? it may also be worth it to throw in NEW preamp tubes in v1/v2/v5 to see if your lack of bass is a preamp tube issue. if you already swapped, then disregard.
anyways, there are two final coupling caps coming out of the preamp section that you could increase the value of. i didnt keep this mod myself, as it increased the overall bass to a point that i didnt like the voicing of the amp, but you might (this is why i opted to replace the existing .022 caps in each preamp stage with values customized to my needs, not a general "cure all"). anyways, take a look at C29 and C28. those are .047uf PI couplers that feed the power section, again, increasing the value to .1uf will give you TONS more bass, albeit, again, i didnt find it useable sounding so i stuck to stock and adjusted the bass different ways over time/my perceived tonal needs. i think this is why you see guys send amps a few different times to the same mod guru...tweaking until perfected. thats what i did...tried different things and tweaked it til it was perfected for me.
also, i suspect you're going to dig in modding your 5150, and if so, i'd strongly suggest these schematics:
and this signal flow chart:
those should help simplify the head scratching and questions about signal flow for you.
the OLD 5150 schematic that is all over the web is really grainy and hard to read.
