| mroovka |
Hello everybody,
I'd like to build tube amplifier on my own and I had chosen Ampeg SVT, but have a problem with schematics:
On the Internet I can only find an old SVT schems (http://users.aol.com/bluemuse/ampeg.html -SVT preamp and SVT poweramp). that uses 12DW7, 12BH7, 12AX7 & 6C4 tubes in preamp and driver stage. This times it's very hard to find 12DW7 & 12BH7, even impossible in my country :/
Does anybody have the new schematics (with 2x12AX7+ 12AU7 in preamp and 12AX7 + 2x12AU7 in driver) or can just adjust the older schematics to use only 12AX7 & 12AU7 against DW7, BH7 and 6C4?
I'll be enjoyed with every help
--
Peace |
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| teemuk |
SLM electronics had the factory schematics of some "newer" Ampeg and Crate models on their website about a year ago but now they seem to be all gone. I guess those companies are now trying to make profit with selling them. Anyway, you should check - even back then the link to those files was pretty "hidden". I have the schematics for SVT-CL with 12AX7 preamp tubes but I'm not sure whether it's legal to share them.
Edit:
The Ampeg website states:
"At this time Ampeg does not display schematics online. However, if you wish to obtain a physical copy of product schematics, please contact the LOUD Technologies Inc. Service Center at 1-800-898-3211." |
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| zeonrider |
All about tubes is OK, what about output transformer ?
Regards zeoN_Rider |
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| mroovka |
I've posted to Ampeg. They sent me requested schematics. Thanks for any answers.
BDW: It's good to know about ECC832 ;) |
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| Ragnar |
That`s great news. Would you mind sending them on my mail ?
I would appriciate the new models...
thx |
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| Ragnar |
or you can upload then for some time here, so I and the others interested in them could get them..
did you get the SVT CL ? that would be so cool :rolleyes: |
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| basstard |
sorry to resurrect such an old thread, did anybody ever finished the SVT?
I'd like to build the SVT preamp and then use it with a serious poweramp,,,
BTW I got some schem's if anybody is still interested,,, they're marked SLM Electronics so I guess they're original,,, still I didn't check for any error,,, |
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| Ragnar |
| yes, I have completed SVT3 pro preamp and i really like the sound of it, I managed to acompany it with the Leach poweramp build for 220W and have a realy neat sound, powerful, but unfortunately I don`t have any serious bass box for it, just a bass speaker, but It sound great anyway. |
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| basstard |
beautiful,,, do you have a schematic for your build mate?
I got the SLM ones but they're a bit too complicated for my being thick,,, :D |
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| spirus |
did u really get the schemos by e-mail?
from ampeg directly no cost at all?
would u like to share them with us?
thanks! |
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| basstard |
| I can send you the stuff I got if you want. For free, obviously,,, |
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| spirus |
perfect!
so do u need my e-mail address?
or you will upload them somewhere and I will download them from there? |
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| basstard |
| would be better if you pm me your mail address,,, I won't spam I swear! :D |
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| Ragnar |
| quote: | Originally posted by basstard
beautiful,,, do you have a schematic for your build mate?
I got the SLM ones but they're a bit too complicated for my being thick,,, :D |
Sure, there is a schematic for that particular model I`ve built, just check for some schematic sites like schematicheaven, no problem ;).
I just built the preamp without the graphic equaliser (couldn`t figure out, how to cut the holes for vertical pots right to the font of my 2U rack:( ). |
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| basstard |
Thx ragnar.
Thing is on schematic heaven you get the 1972 version which may not be like the newer one [I still have to compare the two schems].
I'm not interested in a vintage sound at all, I play what some have called "percussion bass" so I really need a modern, slightly overdriven sound like say chris beattie of hatebreed or dd verni of overkill,,, don't know if you've ever heard them,,,
guess I'll need to brace myself and dig deep into those schems I got,,, they look quite complicated,,,
spirus, when I come back from work later today I'll send you the schems I got,,,
needless to say, anybody else in need of those schems just tell me and I'll mail them,,, |
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| basstard |
beatiful! thx ragnar, I got the exactly same schem,,, I also got the svt4pro schem [probably off of the same page, can't remember where I got it] I'll try and look for the differences between these two preamps,,,
I had the same prob with the graph eq on the Bogner XTC replica preamp, it doesn't have one but I wanted to throw one in,,, just had to ditch it for space issues [it's a 1 unit rack!] and I couldn't figure out how to cut the vertical holes for the sliders,,,
maybe one could cut a big square hole into the front panel then use plastic [easier to cut] or whatever for the graph eq panel and bolt it to the front into the square hole,,, I don't know if I made myself clear, I'm **** at explaining things in english,,,
spirus, I just sent you the schems,,, anyway, they're the same you can find on the link ragnar posted,,, |
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| Markus2006 |
Ragnar,
Do you mean that you build the preamp; including valves, rather complex power supply and mid frequency inductor? Can you give some more details? I'd like to see the PC board for this preamp.
Mark |
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| Ragnar |
to Basstard: Yes, I understood right, but I won`t build that preamp to it anyway now :D because over the pots I placed manual switches for ultra Lo/Hi mode etc.
to Markus2006: well yes, no problem, I attached some links below, of course instead of (i guess) 5 possition midrange switch I justmade every even position, so I have 3 instead of 5, just the coil was a bit hard to make, because I had to wind it manualy :dead:.
I`ll see that few components like tube sockets are still missing, that`s because I made these photos in the middle of the work :cannotbe:.
http://thorssonamps.tym.sk/amps/mjolldjur/preamp.jpg
http://thorssonamps.tym.sk/amps/mjo...-bottom-PCB.jpg
http://thorssonamps.tym.sk/amps/mjolldjur/guts.jpg
have mercy, don`t blame me for that finish :angel:. |
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| basstard |
Ragnar, just been on your homepage and I've seen some very nice builds there,,, shame I can't read slovak,,, but my congrats never the less.
I see you have much fun in etching copper,,, :D
Me myself I just bought a shipload of turrets,,, that should do for the next 3-4 amps,,, I'm in love with point to point builds,,,
Also, are you on SLOclone? it's a nice place and I guess you should like it given your interest in building higain amps,,,
BTW, what cab you usin with the SVT head? and do you have any clip of that? |
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| Ragnar |
:bigeyes: thanks, well, I do etch boards myself only if it fits A4 paper, that`s the size of blue foil I use to transfer the board layout right onto the board, which I have to design in eagle. I don`t 100% copy any of the amp I build, i try to define my own sound heh.
Well, I know that soldano is some kind of clone to the MB recto, but I prefer that recto, I played on some builds of SLO, but I didn`t like the sound, it more fits rock than extreme metal, but anyway, KranKs are my beloved onces :D
I don`t use some special kind of cabinet with that amp, my friend borrowed me a 1x12" bass cab once and it kinda sound quite good with it, I`m not a bassman, I just play bass, record with it, but I`m a guitarist on the first place :).
Of course, I used to make amps with p2p style, but for hi-gain, it tend to generate oscilations and signal noise, I fell in love with combination on PCB and tubes :), it takes some time to design the board, but after that it`s worth it.
cheers |
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| basstard |
I got quite some questions, especially about the pcb oscillation thing, but I don't wanna go off topic anymore.
I'll just say that if you think sloclone is just for the slo you're deffo wrong,,, there's a section called 'other noteworthy amps' that has two or three things to teach everybody ;)
oh, there's also a nice krank thread you might like,,, :D |
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| Ragnar |
yeah I know about that, I just mentioned I don`t like soldano as an amp, nothing more..
as for the oscilations, I meant things like when tho absolutely different signal busses runs along each other, it might interfere and so it would probably enerate signal noise, thats why I use to fill up empty places on baord with ground signal therefore many of the signals stay "sealed" and oscilations have much lower chance to generate themselves. As long as gaps between signals stay adequatly big, I won`t thing about parasitic capacities and so a tone suck.
that`s all from me for this one, sory for the OT :cannotbe:. |
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| Markus2006 |
Ragnar,
What are the parameters of this famous mid frequency selector in Ampeg? I couldn't find it.
Mark |
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| Ragnar |
| heh, I can`t now remebmer it precisely, but I remeber a number 800, so the inductance of the coil should be 800mH....but I`m sure that on one forum I found even percentage of that taps for 5 selections... |
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| jbrew73 |
| 0-100-300-800 its on the svt-vr schematic. i've seen it on some older schematics also. |
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| Ragnar |
| Yes, that`s it, but on Pro series I remember a 5 pole switch, but, the inductance is 800mH for sure...but if somebody want`s to dial some different taste, coil can be still rewinded :smash: although winding it again and again manualy is quite a work :dead: heh. |
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| Markus2006 |
I was thinking about replacing the inductance with gyrator OpAmp. But still, this would be a very difficult project. Ragnar, would you like to share the board? And how different is your preamp from the original?
Mark |
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| Ragnar |
hm, there`s no more boards, because my dead harddisk took them away, and only two circuits back-uped on flash key was rescued :bawling:, I won`t start any project now untill I`ll buy a new PC.
Anyway, this preamp wasn`t 100% original, as I designed the board, I also made some upgrades and modifications to it until it was finished, I reduced number of midrange switches frof 5 to 3, added som extra RCs, and some of the other parts vaues changed, especialy caps and resistors, to slightly calm down the drive, which was a little bit too high for me if maxed...
that`s how avery project ends until it is absolutely finished, modding till death :angel:.
but even if thats preamp look`s difficult, if made on pcb, it will look more simple when done...;) |
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