AX84 BBS Recent Posts as of Thu, Sep 18th, 2014 @ 22:50:18 http://ax84.com Amp Parts and KitsDoberman Music Products, LLC offers a variety of parts and kitshttp://shop.dobermanamps.com RE: Most complicated documented build?(by jlaustill) <div class="quoteblock" >On 09/18/2014 @ 14:40, steve25 wrote : If laying claim to building something more difficult than some one else is what you are looking to get from this amp site then you need to know that by all means not what this site is all about my friend!! -- </div> I have no desire to do anything of the sort, I merely have an appreciation for what people have accomplished and like to seek out the odd and different. The amps I have built wouldn't win an award in a how to randomly pile electronics competition lol.Thu, 18 Sep 2014 16:10:10 -0400 http://ax84.com/bbs/dm.php?id=486327 RE: Most complicated documented build?(by steve25) If laying claim to building something more difficult than some one else is what you are looking to get from this amp site then you need to know that by all means not what this site is all about my friend!!Thu, 18 Sep 2014 14:40:42 -0400 http://ax84.com/bbs/dm.php?id=486326 RE: radial or axial(by Joe L) I agree enthusiastically with TedMitch. Radials are better, cheaper and more reliable. It's time to move on. ..Joe LThu, 18 Sep 2014 14:12:32 -0400 http://ax84.com/bbs/dm.php?id=486325 RE: Free Backing Tracks(by stringbend) Not exactly the same thing but I make my own via Band In A Box. I love the way you can mute each individual instrument as needed. Plus, you can vary the tempo and change the key as well. My interest is in jazz standards. I've not used it, but Ralph Patt's website (home of the major 3rd guitar tuning) offers a good selection in this genre. Wouldn't surprise me if his are BIAB created too. Thu, 18 Sep 2014 12:21:43 -0400 http://ax84.com/bbs/dm.php?id=486324 Free Backing Tracks(by RickTown) Hey All, Occasionally, I'll be on youtube watching gear demos or song covers or lessons, and I'll often read questions in the comments asking where to get the backing tracks. I feel bad for all these poor "backing-trackless" souls, so this is the site I use. <a href="http://www.guitarbackingtrack.com " target="newwin1411095024">[link]</a> I love it. Keep in mind that not all backing tracks are created equal, but I've had pretty good luck finding very usable tracks for all the songs I've looked for. Are there any other good sources out there? Thu, 18 Sep 2014 12:21:43 -0400 http://ax84.com/bbs/dm.php?id=486323 RE: PCB rev 4 sockets don 't fit(by PhilS) The best you can do if you keep the PCB is order the correct sockets. Otherwise, you've got to think about the force of tube insertion and removal and how that will affect your installation of the socket. I think if this was mine and I wanted to keep the PCB, I'd go for chassis mount sockets and wire them to the PCB. I am not a PCB type of guy, so ordering another wouldn't be on my list. The suggestion to build it without the PCB is also a good one. I would not attempt to mount the misfitted sockets on that board. Thu, 18 Sep 2014 08:47:26 -0400 http://ax84.com/bbs/dm.php?id=486322 RE: Biasing for a KT88(by Asa Patterson) Tube's biased nicely, thanks for the help everyone. Any idea why the suggested resistor value would've been 200? Is my needing a lower value indicative of a problem somewhere else? <div class="quoteblock" >On 09/17/2014 @ 04:12, steve25 wrote : Also sorry in my first reply as I missed you where building the EX version! -- </div> No worries!Thu, 18 Sep 2014 07:52:43 -0400 http://ax84.com/bbs/dm.php?id=486321 RE: PCB rev 4 sockets don 't fit(by Darren Porter) You could also attach your chassis-mounted sockets, solder some solid-core wire from the pins and mount the PCB to the chassis in such a way that you can solder the wires from the pins to the PCB's holes.Thu, 18 Sep 2014 07:16:07 -0400 http://ax84.com/bbs/dm.php?id=486320 RE: Anyone have experience building a Gainclone?(by Darren Porter) Rick... Those look interesting Rick. I'll have to look into them. They sure are cheap! I may be able to put those to good use in other electronices projects too. Stevo... that transformer looks perfect! $41 is not a bad price either. I may go that route. I just want a simple DIY amp for my computer desk. I have some really nice compact JBL bookshelf speakers I bought a long time ago that would go perfect with a Gainclone-type amp for a computer station. Certainly lightyears better than my $30 Sony speakers that motorboat like a cheap trolling motor! I know I could go tube but that would be overkill for this. Thu, 18 Sep 2014 07:09:30 -0400 http://ax84.com/bbs/dm.php?id=486319 RE: PCB rev 4 sockets don 't fit(by spud) You might have a 3rd option: get different sockets that align properly. Are you sure you have the correct tube sockets? If they are not the exact same ones he used to create the PCB template, you might have issues. Try to find other tube sockets and see if they will fit any better. This seems like the cheapest and least issue filled option to me - at most it might be a little bit of a hassle. JimThu, 18 Sep 2014 04:42:21 -0400 http://ax84.com/bbs/dm.php?id=486318 RE: Anyone have experience building a Gainclone?(by Stevo) I built one a couple of years ago. Recently, one of my channels has begun cutting out, I believe due to thermal stress. I don't think my chips are heat sunk well enough. Decent sounding amp, anyway. I'm pretty sure this is the transformer I used: <a href="http://www.antekinc.com/as-3225-300va-25v-transformer/ " target="newwin1411095024">[link]</a> By my estimates, you'd need a 300VA transformer, and the two secondaries means you can easily get the bipolar supply with either 115 or 230 mains. Not too expensive either!Thu, 18 Sep 2014 04:24:19 -0400 http://ax84.com/bbs/dm.php?id=486317 RE: PCB rev 4 sockets don 't fit(by Kursad K) Just build one without a PCB. It's a lot easier than ordering a custom PCB. You could also try etching one yourself, but working with chemicals at home where children play with anything they can find is not a good idea. KursadThu, 18 Sep 2014 01:53:50 -0400 http://ax84.com/bbs/dm.php?id=486316 PCB rev 4 sockets don 't fit(by DutchMarco) Hi all, I (at very long last) took to finishing my Ffly Rev 4 PCB build, and I discovered that the pins for the tube sockets don't align with the PCB-holes. Now, what I could do obviously, is 1) bend the pins on the tube sockets and try to make them fit, hoping they survive use of the amp. (without cracking/bending) - I'm not liking this option, too fussy to bend the pins, the right amount etc. 2) take the PCB and drill some holes for the sockets, then drop the PCB over the chassis mounted sockets, and create small wire bridges between pins and sockets. - also not really liking this option, risk of cracking seems a bit big to me. 3) source a copy of John Calhoun's PCB design file, redesign the PCB to use the same build style as in (2). Which would you choose? This seems like a reasonable supplier: <a href="http://www.custompcb.com/" target="newwin1411095024">[link]</a> Thu, 18 Sep 2014 08:47:26 -0400 http://ax84.com/bbs/dm.php?id=486315 RE: New Amp - pics(by jlaustill) Very nice! I love the work you did with bending your wires :)Wed, 17 Sep 2014 20:03:21 -0400 http://ax84.com/bbs/dm.php?id=486314 Most complicated documented build?(by jlaustill) Anyone have any links to any seriously complicated builds people have done? I'm curious what people have managed to accomplish after building my own frankenstein amp :) . I've seen some 2 channel amps that people have built successfully, anyone ever seen a 3 or 4 channel? I saw one kid claim that he built his own dual rectifier, but his only evidence was a grainy video, so I'm not convinced it wasn't just a really beat up one he put in a new box lol. I look forward to any and all neat/complicated/odd/whatever things you may know about :)Thu, 18 Sep 2014 16:10:10 -0400 http://ax84.com/bbs/dm.php?id=486313 RE: Anyone have experience building a Gainclone?(by RickTown) Never built a gainclone, but I found these "hexa-path" trannys from Coilcraft. <a href="http://www.coilcraft.com/hexa-path.cfm " target="newwin1411095024">[link]</a> They have 6 identical windings which can be wired parallel or series in any combination. Datasheet <a href="http://www.coilcraft.com/pdfs/hexa-path.pdf " target="newwin1411095024">[link]</a> I'm using the HPH6 for a high current boost SMPS. Maybe they'll work for you. Wed, 17 Sep 2014 19:31:17 -0400 http://ax84.com/bbs/dm.php?id=486312 RE: PT orientation (by cameron nicklaus) <div class="quoteblock" >On 09/17/2014 @ 17:02, steve25 wrote : The. Copper banding on the PT really needs to face the OT" -- </div> Thanks, I'm not really seeing the banding. The laminations are horizontal, does that help my cause? <a href="http://www.classictone.net/40-18027-04.JPG" target="newwin1411095024">[link]</a> Wed, 17 Sep 2014 18:50:33 -0400 http://ax84.com/bbs/dm.php?id=486311 Anyone have experience building a Gainclone?(by Darren Porter) I am thinking of building a Gainclone solid-state stereo power-amp. I've found plenty of workable schematics but I am having trouble finding a power transformer for a reasonable price. Any suggestions? Thu, 18 Sep 2014 07:09:30 -0400 http://ax84.com/bbs/dm.php?id=486310 RE: PT orientation (by steve25) The. Copper banding on the PT really needs to face the OT"Wed, 17 Sep 2014 17:02:51 -0400 http://ax84.com/bbs/dm.php?id=486309 PT orientation (by cameron nicklaus) I'm beginning a PR clone build. Got my chassis from weber and my PT from classic tone, I literally held out only one tiny tiny small hope that the mounting holes would match but of course they do not ;) my question is this...can I rotate the PT 90 degrees and drill new holes with out concern of the field causing trouble...or does anyone have a better thought on how to mount? Wed, 17 Sep 2014 18:50:33 -0400 http://ax84.com/bbs/dm.php?id=486308 RE: Thrift Store Find(by stringbend) By now you've probably brought it home or someone else has. But I'll mention anyway that the M3 is a great value. It is sometimes called 90% of a B3 for 10% of the price. I paid $250 for mine around 10 yrs ago. It was fully functional. I've seen them offered for free and for $500 and for $50. These instruments shouldn't be scrapped, if at all possible. I miss mine, but since I can now take my organ to a jam session, I guess I'm stuck in the modern world. Wed, 17 Sep 2014 12:20:29 -0400 http://ax84.com/bbs/dm.php?id=486307 RE: Problem with JTM 30(by steve25) Are you sure you wired the new PI socket right? Why did you replace all the sockets, where they intermitant and making noise if you rocked the tube around? With the tube out of the socket you should read over 300 volts dc on pins 1 and 6 and. No other dc voltage on any other pins and since you tube lights up you have no need to test pins 4,5 and 9. The only other way to have dc voltage on any other pins with the tube out is likely to be a shorted coupling cap or you have bridge a solder connection .Wed, 17 Sep 2014 11:49:07 -0400 http://ax84.com/bbs/dm.php?id=486306 RE: 5W SE with Blues Preamp(by boblove) I stand corrected....My bad.. I didn't read the labeling. Wed, 17 Sep 2014 10:21:50 -0400 http://ax84.com/bbs/dm.php?id=486305 RE: 5W SE with Blues Preamp(by boblove) I was looking at your first link. Isn't that a pp transformer and your looking for SE. Wed, 17 Sep 2014 10:17:31 -0400 http://ax84.com/bbs/dm.php?id=486304 RE: Problem with JTM 30(by orkell Gujnsson) Sorry the problem is a lack of power againWed, 17 Sep 2014 10:07:24 -0400 http://ax84.com/bbs/dm.php?id=486303