I can't seem to find this info on the WWW, but does anyone know what opamps are used in the Apple TV analog output stage?

I recently acquired a vintage Carver C-4000 Preamp. I love this unit but I want to improve its performance by upgrading some of its 14-pin DIP quad opamps - in particular the RC-4136 and the TL074. For the RC-4136, I will be using the Brown Dog RC4136 Upgrade Adapter and for the TL074 a 2X...

I've built the Millet, the Morgan Jones, the SOHA P2P, the SOHA PCB, and a Grado RA-1 clone. The MJ and the 2 SOHA's are still in my collection. I love them but I've been toying with the idea of building a Solid State headamp. Out of the collective wisdom of head-fi.org, what can my DIY friends...

Does this mean we are going to pay through the roof for those Ei 12ax7's now?

I may be faced with an SOIC opamp upgrade which is on the underside of the PCB and the space between pcb and case is very tight. This means a Brown Dog adapter with say (2) opa627's will not fit without cutting a hole in the chassis. Therefore, is it possible to take two single soic opamps and...

This is a work in progress. Keep checking in for more updates. "Auricap Tweak" - This tweak provides tighter bass, less hash, really smooooths the music out. This is done by installing TWO .47 uF/600V Auricaps in parallel, with the red leads to the hot terminal and the black leads to the...

I have finished modding my Denon 2900 which included power supply upgrade and output stage upgrade. The latter included replacing some opamps with AD8066 on browndogs. The issue I am experiencing is a "sizzle" sound from time-to-time in the left channel. It comes and then goes. Another...

I've been attempting to improve my $40 Entech Number Cruncher 203.2. According to my internet research, all the regular tweaking tricks have been attempted in modding this DAC but with very little success. The only two that seem to work best are changing the opa2134 opamp to AD8066 and...

I need a schematic coach to tell me if I got this layout correct. Here's the layout. Here's my interpretation of the layout: 1. One end of the 3300pf cap is connected to Pin 20 (FILT) and the other end is connected to Pin 21 (AGND). 2. One end of the 470ohm resistor is connected to Pin 20...

Finally after 9 months, my SA5K's are now fully functional again. It's a long story but it included a blown driver caused by the spliced Sony stock cable, an inadequate "repair" by Sony (that took 5 months!), a new (but defective) DIY replacement driver from Sony Parts, and then a 2.5 months...

I came across this schematic today. It requires two output transformers which costs $$$, but then I learned that there is an OTL version of the same amp. I cannot find the schematic for this version but is a matter of replacing the Output Trannies with a film cap of somewhere between 10-20uf...

I came across this schematic today. It requires two output transformers which costs $$$, but then I learned that there is an OTL version of the same amp. I cannot find the schematic for this version but is a matter of replacing the Output Trannies with a film cap of somewhere between 10-20uf...

Can anyone recommend an inexpensive switch selector in order to create multiple inputs on an amp? Thanks!

I am noticing a reoccuring issue with my Morgan Jones. Upon start up, everything is fine. I crank the volume and then a spark and a pop occurs in the right channel. Any ideas to fix it?

I am looking for someone to etch and drill a double sided pcb for me. I have all the appropriate files. Of course, I will pay for supplies and labor. Please PM me if you are interested. Thanks!

I am in the process of considering the purchase of the HD600's and I've been doing all kinds of research on replacement cable choices. I can't afford say the Zu Mobius or the Moon Audio Silver Dragon, b/c I am a guy on a slim budget...OK I am cheap and stingy. That is why I dig DIY so much! But...

Been reading a great deal of good things about the DT880's. What do you think the move from Sony's SA5K's to the DT880's would be like? Do you recommend it or not?

I’ve been living with the Philips SHP895 Headphones for about two weeks now and I’ve taken them through the paces sufficiently to write a review. Unfortunately, these are not available in the US, but they can be purchased through various Asian and European Online retailers. I purchased mine on...

I just got my Philips HP895's two days ago and am beginning to think about a replacement cable. The good thing about the Philips cord is that (ala Senn) the cord is detachable. The mechanism is a 2.5mm stereo mini plug that is inserted into the left headphone and then twisted to lock. Does...

The Philips HP895's are on their way and I am already thinking of upgrading the stock cable. My presumption is that replacing the cord with something better can improve the sound quality of these budget cans. Replacing the cord on the 895's are a snap as it has (ala Senn) a detachable cord...

My RA-1 Clone on PCB is going well. However, this AM when I connected everything I noticed one of the 9V batteries was extremely hot. I assume this is not good as it could become very messy. Any help with this issue would be greatly appreciated from my wife and kids. I understand that...

Can anyone tell me where to connect this ground (circled in the picture)? To the RCA's?

Can someone recommend a retailer for the Philips SHP895? They are not available in the USA. Thanks!

Three months ago, a channel imbalance had developed in the right headphone of my then "just over 90 days" Sony MDR-SA5000's and I sent them to Sony for repair. Last week, I received my SA5k's back from Sony. I really love these phones and I was overjoyed to have them back. I listened to them and...

Three months ago, a Channel imbalance had developed in the right headphone and I sent them to Sony for repair. After a great deal of runarond with Sony concerning their warranty, they agreed to fix them if I pay for labor. Last week, I just received my SA5k's back from Sony repair after three...