MJMP Please give me your thoughts on this. Everyone is welcome to chime in as well.
I've been going over a lot of Peavey schematics here are some ideas I have do a pretty good mock up for a 5150 tube stage.
R6 (220k) C15 (1uf) R24(jumper) R25 (1.8k) C10 (.022uf) C11 ( 470pf or 2.2m resistor?) R20,R21 (470k) C14(1uf) R22 (1.8k) C9 (.022uf) R19 (470k) R18 (1M) R15 (39k) C7 (none) C3 (.022uf) C4(jumper) R13 (220k) R14 (330k) then Piggy back a (.001 uf) cap over R14. R2 (220k) R16 (1.8k) C6 (1uf) C5 (.022uf).
R7,R23 (47k) C12,C16 (1uf or .47 uf)
Now that is almost the exact layout for the first four tube stages of the Original 5150 minus its extra gain stages. I think this would be a great revision of MOD3 and give users more of less exactly a 5150 tube board. I'm also thinking of relocating the H wire to the 7th pin of V1b like in the 3.666. The 3.666 is a pretty damn good since we only have four gain stages its a great copy of the first four stages of the Recto minus the leads stages.
Appreciate your feed back and thoughts.
Does anyone have the specs for the voltage going into the Anode Triode on a 5150? On the Mesa's and Soldano's its very high voltage.
Quote from: RobbHell on September 12, 2014, 12:36:13 PM
Does anyone have the specs for the voltage going into the Anode Triode on a 5150? On the Mesa's and Soldano's its very high voltage.
my 5150 script logo measures as follows (give or take 10-15 DCvolts depending on whats running in the house, so take it with a +/- 20 or so!)
plate volts at pin 3 of power tube - 495 (i've seen it as high as 515 though)
preamp main tone tubes at the plates measure DC volts as follows:
v1a (first gain stage) 160dc
v1b (second gain stage) 217
v2a -295
v2b - 168
v5a - 248
v5b - 189
i assume you dont need the fx loop or PI tube readings as there wouldnt be any real way to implement these in the ada mp1 mod.
v3 is the effects loop tube
v4 is the phase inverter
A MDRT would help but yea I noticed in most of the schematics I was reading between Peavey/Mesa/Soldano the plate voltage was usually 215-395+ .
Would anyone be interested in this? Was hoping for a little more feed back.
Always loved the 5150 sound. I have an ada mp1 with the mod3? Soldano/5150 mod?. Its ok. But if you want test subjects to try the above lol im happy to use that ada.
The Mod 3.1 uses (2) 470k resistors and a 1M for increased gain compared to the Mod3.
I've always felt Mod3 was a bit unfinished. That's where the listed above changes come into play. My spare Tube boards are in storage or I would have built it.
I feel these refinements will surely give MOD3 that 5150 Block Letter sound but cleaner.
Quote from: RobbHell on October 08, 2014, 02:41:29 PM
The Mod 3.1 uses (2) 470k resistors and a 1M for increased gain compared to the Mod3.
I've always felt Mod3 was a bit unfinished. That's where the listed above changes come into play. My spare Tube boards are in storage or I would have built it.
I feel these refinements will surely give MOD3 that 5150 Block Letter sound but cleaner.
im not using a mdrt powersupply but for some reason I felt my stock mp1 sounded better than the mod3. The mod3 sounded brighter and the eq didnt behave like my stock. My mod3 sounds like a low gain soldano. Thats why I prefer my soldano preamp most of the time cause its high gain.
So i just need to make the changes above to the board. I dont have tube boards unfortunately so ill just use the existing
The Stock Gain Mod isn't bad but nothing to get excited over.The sound issues your describing is because only the Last Gain stage is Modified with too different tone caps. I'm not here to.bash but Mod3 sounds like shit because its a Half assed and unfinished mod.
Why the first two stages were left untouched is a Tard move and lazy honestly.
That's why felt it was time to give back my time and research into updating... Hell I use combo of mods on my ADA. Yes I felt ADA stock with a Eq sounded better than MOD3.
I just drove me nuts to read Mod3 schematics.I appreciate the work that went into developing the Mods but honestly the First three Mods are a step backwards for ADA users. Lets fix this now lol.
An MDRT would be a must to take full advantage of the Mod. The Slo/5150/RECTO all have high voltage well above the MP1s stock 180v.
I'm rather surprised MJMP hasn't read or replied to this post.
Ill order one from mjmp
Get his Noise mod kit. You'll be glad you. With more gain there's always more noise. But it can be fixed.
5 or so years ago I had MJMP do me a customized Mod3.1 incl the MDRT to one of my MP-1. It actually addressed some of the points/parts as mentioned above (incl H-wire). In addition, I altered some of the coupling caps to enhance/widen the bass response some, as in the orig MP-1 EQ that is a pretty narrow freq.
To really make that SLO/5150 thing shine, the MP-1 has to be paired with a 6L6 poweramp.
I hooked mine up with an old Boogie Fifty/Fifty and the result was a SLO100 on steroids with creamy singing leads and bold rhythms. Palm mutes were spot-on tight and hi-gain open chords still had that note separation.
Dunno about the exact specs/parts anymore though....just that I used Orange Drop 716P as they (imho) sounded a tad bit more "breathing"
I just plugged my mod3 into my vht kt88 and cranked it and geezus it sounded awsome. I retract my comment before lop however its missing something. I wonder how close the mod3.1 is on mjmp website is in comparison to above changes. Im reluctant to change my board now after hearing it again out of storage. If the specific mods are on the tube board I might buy another from mjmp perhaps.
and perform the noise mod however I had no noise at all on this unit. I was impressed to be honest.
It was loud articulate. . But feel it could he better.
I tend to notice Clean Tube driven hard has that thick Slo sound not Dist Tube. Relocating the H wire really helps A Lot!
Mod3 lacked gain for me to consider it 5150... SLO medium gain yes.
Good move on the Orange Drops that's the way to go. Mallorys are great too.
I also like the mod3 and the mods systematic suggested back then were so good i kept them in the mod3 boards i sell.Most of the time i make the mods a bit customized to the likings of the customer.The mod 3 was never meant to be a super high gain mod.I also like the clean tube sounds the the mod3 has.This was never possible when the board was heavily modded.It's always a bit of ying and yang i guess.
Now as for plate voltages usually the first preamp tubes have lower voltages,usually in the 150-225V range,the last stage the phase splitter is higher more in the 300V range.This is done to have enough voltage swing to drive the power tubes.This is close to the max voltage specified in the datasheet of the 12ax7/ecc83.I don't think these can handle 400V plate voltage,especially the current tubes in production.
Quote from: MarshallJMP on October 09, 2014, 12:57:15 PM
I also like the mod3 and the mods systematic suggested back then were so good i kept them in the mod3 boards i sell.....
MJMP...!!! I´m honored!!!!! :bow: :bow: :bow: :bow: :bow: :banana-dance:
If it's good it's good :thumb-up:
I understand but Mod3 is described as Modern Distortion tone. Slo/5150/Recto. Sorry those are High Gain amps can we agree on that? I just think the description is false and misleading.
I don't a point in less gain in a MP1. Traces Voodoo Mod blew straight ass. He took a Metal preamp and turned it to a 60-70's rocker and charged $500+ WTF!?
The only mods I can see worth doing is the 3.666 and 3TM. Honestly just one added gain stage would be sick with out the Cathode follower.
MJMP were looking for 5150 gain out of the MOD3. Block Letter style. I've done.most of the foot work. Lets see what You,GB and I come up with. I've been a Depot Mod user for over 10 years. Lets all collab and get back a New Mod to the Depot.
I'm not saying completely drop Mod3.... but a Mod3 5150 would be nice.
Can you at least comment on my Mod idea and adjustments and chime in with your two sense because I think its a pretty damn good idea. Why the fear of something New?
GB is going to do some testing and exchanging ideas with me it would be cool if MJMP joined us.
Ok i'm in.Mail me with some info.
why can't I upload a 2MB jpeg?
.jpg files up to 10MB should be ok (I just verified in attachment settings), so it should work fine. That's if the file really "is" a .jpg, just coz it's got a .jpg extension doesn't mean it is a jpeg (sorry IT Security hat on LOL). And unfortunately, jpegs are a know and often used place to hide malware. Recommend some malware scans with different products (avast, sophos, AVG have free ones) (always a good idea regardless).
Appart from that :crazy:
BTW IIRC when I was attempting to play the snippet you sent me a while ago it was pretending to be something else and not the file extension it was supposed to be. ?
Upload to e.g. Photobucket and insert the image-link
Works for me ? (although it's now got an Ultrasonic not the SD Hot Rail) You can do a work around (as SC suggests), but if its a "normal" .jpg it should work.
Hi guys 5150 Mod would be GREAT!!!!!
Sorry this has taken so long. My injury took a little more of me than expected. Working without the use of my right arm the last weeks has slowed things down quite a bit.
I sent the schematic to Dante and he was kind enough to pass in onto MarshallJmp for review and his added input.
Sorry this has taken so long but its in the works, thanks to everyone that is interested.
Got it,will have a look. :thumb-up:
Hey Robb, no right arm, what are your doing to yourself, hope it's coming back ok ??
I was in a quad accident having too much fun and seperated my shoulder and clavical from my AC joint. Been stuck in a sling the last 6 weeks. With bruised ribs it wasn't very pleasant. Slowly getting arm to do mild tasks. Just a slow recovery.
Everyone be safe out there.
Holy crap, bummer, so no right hand... I had my left hand in a cast years ago, but at least I could put on a slide on my pinky and play something... I know the bruised ribs, don't catch a cold.. owwww. Hey I'm safe and good, but getting the wisdom teeth on my right side (left done a couple of years ago) out tomorrow (mmm not looking forward to it), 1st world problems (which is what we call our band).
Hey had MikeB here tonight trying his (my original) MP1 (new tube board, Mullard sp V1, boogie STR (JJ?) in V2) GCS3 in loop > desk > monitors. He ran up my 1992 patches I posted, and with his Les Paul, the clean sounds weren't clean, so we tried with my Anderson and, as with my MP2 clean patch, it relies (to a great extent) on the PU selection (and in this case height), so lovely clean mmm. My middle Ultrasonic in the Anderson is lowered as far as I can (so I don't bump into it with the pick), when I combine it switched to parallel with the neck PU switched to series I get the clean tone (a bit of a tone vol suck) witch goes with the patch (same with my MP2 clean patch BTW).
From my part, I got to give the Mullard short plate a run in MP1, nice tube, similar 3D as the long plate but not quite as deep IMHO (so I'm liking the lpts, but then there was only one Mullard splt, 2 would add even more to MP1), these days I find the MP1 a bit 2D and boxy compared to MP2, but the Mullards open them out quite nicely, although MP1's lack gain compared to MP2 (I recon a 3TM with Mullard short plates would sound awesome :thumb-up: ) MJMP ? give it a try ??.
So comment on the short plate Mullard (in MP1): exhibits very similar 3D tones (and depth) as the long plates in MP2 (I can hear the similarities, though quite different circuits), they kind of chime (in a very nice guitar way).., it certainly opened up the MP1 (as they do in MP2)
Hey Rob
Just send you a PM.