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DIY Workshop » The YAHA amp thread part 2 roggom  HeadWizer Joined: Feb. 27, 2008 |  Message [#560] posted on: 12-05-2008 10:07 PM CST (US).   |  |  I have a couple pcb's left pm me. [Edited by roggom on 12-07-2008 at 10:38 PM.] |
| 928GTS Member Joined: Jul. 20, 2008 | Message [#561] posted on: 12-06-2008 09:18 AM CST (US). | | Oddly enough the PCB's came yesterday....they must have been lost in the mail system for quite some time! |
| ludoo Member Joined: Aug. 26, 2008 | Message [#562] posted on: 12-13-2008 06:23 AM CST (US). | | I have just finished throwing together a YAHA using spare parts I had around, a Philips ECC86 and an OPA2132. I did not really plan the layout (apart from sizing the board so that it will fit a Hammond case), so between that and the oversized caps there's quite a bit of wasted space. I'm also a noob so the build is pretty ugly, but I guess there's nothing like doing for learning.  Sounds pretty good, leaner than my Millett Starving Student hybrids and with less impactful bass, but for what it cost I have to say I am liking it quite a bit. I am powering it with a 12V 1A regulated power supply. The only strange thing is that B+ is different for the two channels, one has .7V or so less than the other. Thanks for designing a very affordable, easy to build amp. Edit: cannot figure out how to attach pics, here they are. [Edited by ludoo on 12-13-2008 at 06:25 AM.] |
Lingwendil Member Joined: Jan. 27, 2008 | Message [#563] posted on: 01-16-2009 05:09 AM CST (US). | | Is it just me, or are these little amps addictive? It seems that whenever I have a handful of suitable parts they some how find their way into a new YAHA project! They also make for a nice break from more complicated and labor intensive projects. I even retrofitted one of my older ones with a Szekeres output stage. The Mosfet's load resistors are 100 ohm, 1w, and the circuit is airwired as a direct drop in replacement of the opamp (using the existing output cap) and I also removed the tube's input cap, and added a cathode resistor of 1k ohm. The quality of sound has greatly improved, especially the high end, after these changes. |
| fa-schmidt Headphone Council Joined: Dec. 7, 2001 | Message [#564] posted on: 01-21-2009 12:27 PM CST (US). | | Clearly addictive !  The haunting simplicity of this amp has a huge psychological effect: This is one of the strongest human needs. |
| Neuuubeh Member Joined: Jan. 28, 2009 | Message [#565] posted on: 01-28-2009 02:02 PM CST (US). | | Hey guys, thanks to everyone for all the info in these threads  . Its quite addictive to read about tubes  .I've ordered some parts and am planning to build a Yaha amp with an Ecc86. I need this to drive 320 to 600ohm headphones, so I'm going to use a +12/-12v powersupply using a LT1210 to split the voltage. This means I can drop the output capacitors, as the opamp output (the recommended NJM4456 for start) will have no DC offset, correct? Am I thinking right? I have still to go through all the posts, so excuse me if this has been asked hundreds of times Thanks for your input and take care, |
| fa-schmidt Headphone Council Joined: Dec. 7, 2001 | Message [#566] posted on: 02-04-2009 06:47 AM CST (US). | | Welcome Neuuubeh. You cannot do that plan so easy. The input tube signal reference is ground, not -12VDC. What you could do is to isolate the tube and the opamp input with a cap / resistor combination and have the tube powered by a high voltage and the opamp as described with +/-12VDC. This principle is shown here: |
| kubing Member Joined: Mar. 12, 2009 | Message [#567] posted on: 03-17-2009 01:51 AM CST (US). | | are 6922eh pin compitable with 6DJ8? try to etching my DIGI pcb rite now. |
| fa-schmidt Headphone Council Joined: Dec. 7, 2001 | Message [#568] posted on: 03-20-2009 05:30 AM CST (US). | | Late answer: Yes. The 6922 has the same pinout as the 6DJ8 / ECC88 / E88CC |
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