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Everything posted by Passinwind

  1. [quote name='Chienmortbb' timestamp='1415402080' post='2600106'] I will post a few more pictures of the case innards and the preamp PCBs tomorrow and I am close to choosing my power amp. [/quote] Do you hate me yet? Procuring parts has proven to be much more challenging for you than I ever would have expected, especially given that Wima is a German company and that getting most of their caps in the US couldn't be much easier. I'm currently working through a test build of the new preamp circuit boards myself. Should be making noise within a few days. These boards cost me around $20 apiece for just the raw boards, but I have to buy three at a time from the vendor I'm using, who is more or less local to me: The opamps going into in the top board are pretty expensive and won't get installed until the last minute, no point in roughing them up as things get shuffled around. I have set things up so stacking is easy, and also made a modular arrangement that allows reordering stages if desired. That allows options like having the high pass filter affect the EFX send, or not.
  2. [quote name='Thor' timestamp='1418241479' post='2628405'] I've been playing bass for around 20 years and love playing all different styles of music, the funny thing is I get more nervous at the thought of attending an open mic/jam session, than I do about gigging with my regular bands or depping for another? I guess it's down to the unknown and being outside of one's comfort zone? [/quote] I love that aspect, but I also think a little nervousness can be great for creativity. Train wrecks aren't always the most fun though, have to admit.
  3. [quote name='icastle' timestamp='1418225752' post='2628152'] From a totally different perspective, I'm involved in running one of these nights. I've read some people saying that these places are 'cliquey' but that's really dependant on everyone involved - our club certainly isn't and of all the others around this area I've only found one that is. Find a club, give it a couple of tries and, if you think it's 'cliquey', find another one. I see people tentatively get to grips with playing with other musicians and, slowly but surely, start to relax and become performers. [/quote] Yep. I ran a few different ones for many years and watching the transition from shy newbie to working pro was always one of the most satisfying aspects. I get gig calls occasionally from several of my contacts from playing at and running them, which is a pretty common scenario too, especially for bassists.
  4. [quote name='spacey' timestamp='1417869024' post='2624683'] Ha Ha, ruddy phone, thats it, I give in, how do you turn autocorrect off [/quote] By getting rid of your iWish-I-Was-Smart phone?
  5. [quote name='stingrayPete1977' timestamp='1418074335' post='2626686'] How will the band know they have annoyed a bassist if they dont see them walk in and right out again then though, mind you if the band dont look up they wont have noticed, maybe we should email the venue and tell them to pass the message on to the band? [/quote] You're doing it wrong. Hack their iPads and send them Ariana Grande charts, or pRon, or a nastygram.
  6. I have run stereo rigs on and off for many many years, in quite a few different configs. Lots of people don't get it, just give it a shot for yourself. The localization issue is a complete red herring to me -- I want and embrace a moving soundstage and have never found that to be lost on the audience at all, regardless of venue size. Yes, there are many potential pitfalls, and cutting low bass on one side is often a really good start for circumventing them. Biamping and leaving either highs or lows dry can be very effective as well. Vertical stacking rather than a spread arrangement works surprising well sometimes too. I generally have used a pro sound power amp, sometimes with stereo preamp a la Alembic F2B, more often through a mixer a la Mackie 1202, etc. though. I'm on to a fully DIY solution these days; it's reasonably compact and tailored to exactly what I need. I use guitar synth in my band too (through the same rig), and many samples sound immeasurably better to me in stereo. Then there are the clean/dirty possibilities, a whole other can 'o worms and a whole lot of fun when done well. I have a whole separate noise toy rack and a digital switcher/mixer/EQ/compressor widget utilizing one or two expression pedals for blend and/or panning. Here's one older implementation: [url="http://passinwind.com/RaneRPM26zBassRig.html"]http://passinwind.co...26zBassRig.html[/url]
  7. [quote name='quimbymeat' timestamp='1415911548' post='2605250'] Nice Travis Bean, Is it in the data base? [/quote] Yep, serial # 573. It was originally white but eventually became rather pink from the case lining.
  8. Bound to be in here: http://wiki.talkbass.com/index.php?title=Category:Ampeg_Portaflex_wiki
  9. [quote name='Grissle' timestamp='1415479450' post='2600844'] Any more info on that Mid/High Cabinet? [/quote] I'll do a thread on all my DIY cabs soon -- that's an old pic and the top box looks a bit less janky these days. This one is kind of a fEARful tangent, using many of the bits that Dave Green rejected due to general parts unavailability in the US and/or excessive expense. The woofer and tweeter are BMS, mid is 18Sound 6ND410 loaded on a JBL horn as used in the PRX powered cabs. I did my own passive crossover. There's a second 115 as well, and I guess I would biamp or triamp if using that.
  10. [quote name='eude' timestamp='1415475969' post='2600805'] Not heard a peep since the launch, its been a bit too long I reckon, I think they've probably put these heads to bed [/quote] Nope, the designer has posted regularly on TB and last I heard they are at pre-production sample stage, meaning field trials to confirm final build spec are happening, or about to very shortly. Sounds likes a realistic release date around NAMM (late Jan.) is in the works.
  11. [quote name='Bass-Driver' timestamp='1415476100' post='2600807'] Instant early Mick Karn sound! [/quote] Can do, but it also excels at rude noises of many other flavors.
  12. Crescent Moon Fretless, Q-Tuner pickups: '77 Travis Bean Fretless:
  13. [quote name='6v6' timestamp='1415351689' post='2599415'] Aww man, I feel bad now. [size=4]Apologies if my demands appear unreasonable - it wasn't my intention to derail this thread [/size] [size=4]H[/size][size=4]onestly, I thought my original request for details would result in a "sure, here's a link to the thread with the preamp schematic on TB", but if that's not the way this is going down, (again) fair enough.[/size] [size=4]In my defence, I'm an engineer, and thus immediately want to discuss implementation specifics. That's my affliction though, I can't help it! [/size] [/quote] No hard feelings here, and I don't think your request is unreasonable at all. I first met Chienmort online when he wanted to know about exactly how I added a midrange control circuit to an older bass preamp build I did using Rod Elliot's Project 94 as a jump-off. Since there are really not a whole lot of good dedicated bass preamp DIY projects detailed online, my M.O. has often been to just steal circuit bits off commercial schematics, albeit usually with mods by the time I get something I'm happy with. That just might have something to do with my reluctance to post schematics of some of my builds... I was schooled as a electronics technician actually, but a number of my day jobs over the years have made me hit the books pretty hard to go a little beyond that. It's often a fine line anyway, in my experience.
  14. [quote name='LukeFRC' timestamp='1415308287' post='2599159'] some of the moduals are cheaper to get I think if you buy a PA amp based around them and cannibalise it! [/quote] Yep, especially if there is an OEM version and a separate DIY-friendly one, as is the case with Hypex. Someone on TB gutted a Genz amp and put in an older Eden front end, and I did consider just buying a G-K or Kustom and using the power module. It cost me around $300USD to get the 500ASP and all the needed wiring harnesses, back end inductive filters, etc. There's an old designer's manual for the ASP series that one can find online, which was hugely helpful. I used to do sanctioned warranty service for many brands of pro audio and musical instrument electronics, so I often at least know who to ask when something's clearly over my head, which happens fairly often.
  15. [quote name='Chienmortbb' timestamp='1415285458' post='2598773'] The case for the defence?[/quote] Looks roomy enough to work in easily, I like that. I'm currently doing a 1/2 rack size preamp-only build in this case:
  16. [quote name='LukeFRC' timestamp='1415302584' post='2599081'] just to say - it's good to have you around [/quote] Thanks Luke. I have a ton to learn about this DIY affliction myself and just looking through Chienmort's eyes at module and parts suppliers outside of the US, import duties, etc., has been quite an eye opener. I used the ICE 500ASP module in my last build, after gigging for several years with an OEM plate amp from SpeakerPower using the 1000ASP. You can find either of those modules fairly easily on a few DIY forums, but B&O give no tech support and it's a bit of a gamble at best. I like the looks of the 700 watt Hypex module powered my their 1200 watt SMPS a lot, but it is not cheap by any means.
  17. [quote name='6v6' timestamp='1415269830' post='2598529'] [size=4]Ok, fair enough.[/size] [size=4]For me that devalues this thread quite a bit, because without specifics like schematics, it becomes a build commentary of an effectively private collaboration between you and [/size][size=4] Chienmortbb, rather than an actual build diary.[/size] [size=4]That said, I'm sure the other details you mention will be interesting. [/size] [/quote] This is Cheinmortsbb's thread and if he cares to post a schematic for whatever form his own builds eventually take (or even when he just gets to actually making smoke) we will jump off that bridge when we get to it. My boards and design are just a starting point, not a destination. I was deeply involved in the fEARful cabinet R&D and early build threads, and frankly, that just became so tedious after a while. I build stuff for myself as a hobby to satisfy my own quirky needs, try to help a few friends along the way, and have zero interest in being like BFM or Greenboy or Rod Elliot. I'm new to the Basschat culture and have not seen the cab build thread yet, so I'll take a look at it presently. I sort of envisioned any role I might have in this thread as teaching how to catch a fish, not giving everyone a fish -- things like modeling your own circuits in LTspice and laying out circuit boards in KiCad, for instance. I'm not looking to sell anything BTW, but if Chienmort gets something worked up that others really want to build, I could help make that happen via open share circuit boards available straight from my board fabricator. You guys do realize how crazy-expensive this kind of thing is to build though, right?
  18. Audiokinesis Thunderchild 112 Acoustic-Friendly, homemade 500 watt amp.
  19. [quote name='Oopsdabassist' timestamp='1415217438' post='2598076'] You came HERE? Are you mad? You know what its like here right? [/quote] At least all the beer doesn't taste like grapefruit over here.
  20. [quote name='Chienmortbb' timestamp='1415144089' post='2597289'] [b]Passive treble control, boost/cut.[/b] [i]I believe that the The passive treble control is less noisy than an active one and more musical but perhaps Charlie could comment.[/i][/quote] This is something I first worked out in one of my tube preamp builds a few years ago, and it's the closest thing to 'secret sauce' in my designs. It comes from some very old tube gear design manuals, and the fact that it's passive is only half the story, because its placement in a different stage than the bass and mid controls keeps it from interacting with those controls in potentially undesirable ways, intermodulation distortion and slew limiting for instance. Moving it back in the signal chain a few stages also keeps the earlier stages from further amplifying treble boost noise and potentially reduces distortion generated in those stages. As always, the devil's in the details though. I spent many hours in LTspice trying to find a workable solution, and was kind of shocked when it turned out to sound pretty good. My intention is that you can turn it all the way up if desired, and it still sounds fine, with very minimal hiss artifacts. When cranked it actually redacts to more or less a classic CD horn EQ in the 4K-12K zone, which works well with my DIY cabs that use pretty much pro audio caliber compression drivers. Here are the frequency response models from treble control full-down to full-up: By standard marketing speak you might see this spec'ed as a +10dB shelving filter at 25K on the boost side, but as the graph shows, marketing speak often leaves a lot to be desired. [quote][b]Variable high pass filter, 2nd order fixed + 2nd order variable[/b] - [i]Think of a Thumpinator or FDeck's HPF. Has the dual purpose of controlling excessive cone movement below a cabinet's tuned frequency and also taking the "boom" out of those nasty rooms.[/i][/quote] Yes, both those purposes are part of the classic design brief. In my design I have also attempted to make the HPF and bass control highly interactive, but hopefully in an intuitive fashion. Here are some compound curves showing bass control boosted 1/8 turn clockwise and left there, then high pass control swept from full up (least cut) to full counterclockwise (most cut): As you can see, peak bass boost can move between 42Hz and 240Hz, and many other curves are readily obtained as the bass control applies various boosts and cuts. Again, I was a bit surprised that I just did the model on my computer, built the circuit, and it measured and sounded fine right off the bat. I made a bit of a mess with the first circuit board design, but I am still pretty new at that aspect and fortunately I have pretty decent board rework skills learned over the years through a series of day jobs fixing and modding audio gear and other electronic widgets. Hopefully the new boards are glitch free, they seem to be from the little bit of testing I've done on my bench. Having someone else build up some of my designs should be very useful in refining my craft, which is the main point of doing DIY builds in my case.
  21. [quote name='6v6' timestamp='1415139554' post='2597224'] There have been references to your design but no links, for those of us who've not followed the TB threads closely (I had a quick look a the link from post #6 but didn't spot the schematic), can you share links to the design's you're referring to and have been collaborating on? [/quote] I'm not planning on posting an actual schematic at this time, but I will be happy to show build pics, component details, block diagrams, performance measurements, and modeled behavior of the various bits. Talkbass messed up their links quite badly with the software "upgrade" a few months ago, unfortunately. This thread shows the evolution from a modified ESP (Rod Elliot) board to my own basic preamp design: [url="http://www.talkbass.com/threads/oh-no-another-diy-rack-preamp-thread.600314/"]http://www.talkbass....-thread.600314/[/url] . The beginning of the thread linked above details the added daughtercard incorporating a variable high pass filter and a one band fully parametric EQ. So there are 6 basic modules available thus far:[list=1] [*]Input gain stage and active bass and midrange control, optimized for active basses [*]Parametric equalizer [*]Passive treble control, boost/cut [*]Effects send/receive/aux input [*]Variable high pass filter, 2nd order fixed + 2nd order variable [*]Final gain stage/line driver [/list] Some of the modules can be placed in varying spots in the signal chain, but my first build is in the order listed. I made the PEQ and HPF modules bypassable by switches on the front panel. I think Chienmort is contemplating using a switchable mid frequency as well. My website at www.passinwind.com has a basic overview of many of my more recent DIY builds as well, along with a few sound clips. There are also a few sound clips here: [url="https://soundcloud.com/passinwind/sets/diy-cab-preamp-demo-clips"]https://soundcloud.c...eamp-demo-clips[/url]
  22. [quote name='VTypeV4' timestamp='1414892464' post='2594495'] I'm reasonably happy understanding valve gear and it's details but Switch-mode supplies, multi-vibrator circuits and Class D amplifier operation is somewhere just beyond me at this time. [/quote] There's a pretty good technical thread on Talkbass by Bobby Baldwin, an amp engineer at Peavey who actually designs Class D amps from a white sheet: [url="http://www.talkbass.com/threads/class-d-illustrated-lots-of-pics.1083366/"]http://www.talkbass....f-pics.1083366/[/url] I haven't taken the dive into that deep pool as far as DIY building just yet, but in time I hope to. I am definitely looking forward to seeing how Chienmortbb's builds evolve -- there are just so many compromises and tradeoffs involved with this sort of project, and at some point one just has to pay their money, make smoke, and see what happens. After I built my amp I revised both preamp circuit boards, and also designed a bespoke power supply, so it's not as if Chienmort will just be building up a known-good design from a blueprint, although we certainly both hope it will play out something like that. A good part of the end result will depend on his own choices and tweaks. I have tried to make my design pretty accommodating to modifications...we'll see how that goes.
  23. Well, there goes the neighborhood. Plenty of familiar faces here, no need to leave on my account.
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