I have some OPA2604 in the drawer and I am thinking: can I use them to build a Pimeta-like circuit using one half for buffer? The idea crossed my mind seeing Levallois-cmoy amp and 2604 datasheet

Does anybody tried this att. sold on ebay? http://cgi.ebay.it/ws/eBayISAPI.dll?...tem=5762004799 The guy has a good feedback and uses Dale resistors. It looks like the one sold by Octave Audio. Only 10K and 100k. I am thinking 'bout a 10k for my M³. BTW: 10k is too low an input...

...these kits/boards? http://eshop.diyclub.biz/index.php?cPath=121 I can't find any info on the site itself apart that they clain no feedback. Thank you.

Some week ago had problems with my PPA: http://www6.head-fi.org/forums/showthread.php?t=90341 It was the left channel cascode JFet's (as Tangent pointed out). I am still waiting for new JFet's to substitute the broken ones so I disconnected the cascodes in all three ch. Everything seemed to...

From time to time these days I had a feeling my PPA had something strange. I wasn't able to realize what, so I though it was suggestion (returnig to 8610's after months with 627's). Today I decided to check my PPA with RMAA to have a performance benchmark for the other headamp I want to mod...

Hello! I am trying (just for fun) to reverse the circuit of the headamp I bought on ebay but I have found a component that I have never seen before. It looks like a small axial zener but has a metal case (alluminium color) with a black band on one side (catode? polarization?). On the case I...

I am trying OPA627 in my PPA but I got an higher offset than with the 8610. With 8610 I managed, moving op-amps in the channels, to get an almost null offset (0.1-0.2mv in al three chnls). With 627 I got 2.0mv in L and R and 0.1 in G and there are no changes moving the op-amps from chnl to...

Maybe it is not exactly the right place but I have seen a lot a discussion here about op-amps and I guess there are people willing to give me an advice. I want to try to change the NE5534’s in my phono pre-amp. Apart from minor changes in the power supply, is exactly the Trigon you can see here...

I had to buy a new standard cable for my HD580, the old one had interm. connections. So, now I have two spare connectors and I want to try to build a more esotic cable with them. The connectors are molded to the cable so how can I detach them in a way I can still reuse for the new cable? What...

Having fried every jfet of my PPA (It was working pefectly, my fault, I shorted something) I am ordering new sets but now a have a doubt. In some recent posts and even in Tangent web site the 2N5457 is said to be a substitute for 2N5486. When my PPA was working, following the datasheets, I used...

It was working flawlessly but testing the current through R9 to set the bias for class A operation (I finally get the correct resistor value) I shorted something with the multimeter. Now no sound at all, it is like dead not even a hum. I guess there is some problem with the op-amp's power...

Hello, this is my first post here (sorry for my bad english). I’ve almost built a PPA that sounds really good already (I have failed to bias it in class A due to a defective 2N5457 – I am waiting for a new one). Now, to test it, I am powering it with the psu of my phono stage (a 27v single...