ablaze 0 Report post Posted February 13, 2003 currently still being built by Dreamslacker..sigh its been almost 3 weeks meta42 v2.1 board Vishay-Dale resistors OPA637P (B-grade) dual-channel opamp (connected via DIP-8 op-amp adapter) 4xstacked EL2002CNs per channel (ie 8 total) EL2001CN power supply buffer Alps Blue potentiometer one pair of Cardas rhodium RCA jacks Biased into CLass A w/ Cascoded Jfets 4 x 470uF Elan Cerafines Neutrik 1/4" locking jack British made aluminium enclosure soldered with WBT silver solder! specs sound good eh? Share this post Link to post Share on other sites
N@Z 0 Report post Posted February 13, 2003 (edited) Can I suggest posting some photos of it. I believe I have seen it but it should benefit other ppl who have not. Edit: Since I'm here I might as well post a photo of my JMT built amp. Too lazy to type all the details. See for yourself... http://us.f1.yahoofs.com/users/4b966496/bc...c7ALT.AHzzdglQJ Edited February 14, 2003 by N@Z Share this post Link to post Share on other sites
jtfoo 0 Report post Posted February 14, 2003 Hi newbie here.. Enter the headphone scene something like 1 month ago when I got my 1st Grado125. I'm also in the midst of bulding my Meta42. At the moment sourcing for components.Here's the part so far I have, meta42 v2.1 board Normal metal film resistors AD8620 dual-channel opamp (connected via DIP-8 op-amp adapter) 2xstacked EL2001CNs per channel (ie 4 total) EL2001CN power supply buffer Biased into CLass A w/ Cascoded Jfets Yet to buy Alps Blue potentiometer. No enclosure in mind yet.... Share this post Link to post Share on other sites
Firefox 0 Report post Posted February 15, 2003 (edited) /me smacks ablaze... Can't blame me if I've only a few hours (countable on one hand) of sleep everyday right? And you mis-spelled Elna Edited February 15, 2003 by Firefox Share this post Link to post Share on other sites
N@Z 0 Report post Posted February 17, 2003 Should it be of any interest, scanned the specs of my JMT META. Hoping to have them upgraded in the near future. http://us.f1.yahoofs.com/users/4b966496/bc...ecification.jpg? Ablaze, what will be used to power your amp? I'm assuming wallwart since you have ALOT of output buffers! Any reason for using that particular op-amp? Great specs though, should sound awesome! Share this post Link to post Share on other sites
ablaze 0 Report post Posted February 17, 2003 using a DC wallwart. its unregulated though opamp? hehe..you gotta ask firefox that Share this post Link to post Share on other sites
Rameish 0 Report post Posted February 18, 2003 N@Z, Cant get the pics to load. Hmm.. Share this post Link to post Share on other sites
Firefox 0 Report post Posted February 18, 2003 The BB OPA637P 'B' is more analytical.. Perfect match for those who like ROck & pop, trance, techno... You get the idea. It's not that forgiving (no colouration of sound). However, it's not a good match for Grado phones. AD's are more warm sounding. Matched with the Grado's, they make a good combi. for vocal based music. However, you can distinctly hear that they don't pack a tight & fast bass hit except maybe with the HP-1. Share this post Link to post Share on other sites
N@Z 0 Report post Posted February 18, 2003 Try this link for the pics: http://briefcase.yahoo.com/bc/naz7577/lst?....src=bc&.view=t Thanks for the explaination Firefox. Share this post Link to post Share on other sites
ablaze 0 Report post Posted February 18, 2003 k, that link works. Share this post Link to post Share on other sites
jtfoo 0 Report post Posted February 18, 2003 Your JMT Meta42 is really quality stuff. I see Elna Cerafine?? and Neutrik Socket. Somemore the the enclosure very professionally done.. My Meta42 most likely going to be in those household groceries boxes again.. I have left over metal tin Mooncake boxes which I intend to use. Share this post Link to post Share on other sites
N@Z 0 Report post Posted February 19, 2003 Cool jtfoo! More 'local' cases I say! I'm thinking of fabricating my own external battery pack soon. Gotta start somewhere! This amp & others are typical of the builder's (JMT) quality of construction. Yes, even though I am not even sure what those Elna Cerafine does they look very tasty! Neutrik socket, well, what can I say? The specs were specified initially with concessions to portability but discussions are being made right now to upgrade the buffers to quad EL2002 like ablaze's plus a 4700uF, 35v Nichicon "Gold Tune" cap & some other minor adjustments to the resistors. This should bring it closer to a Maxed Out META. Anything more & I'd probably just get a Gilmore. Share this post Link to post Share on other sites
