Hey how ya doing. I gave my brother one of my amps, the Indeed with a Phillips Miniwatt tube. Also gave him a pair of Sennheiser 201's. Later that day I got an email saying this new stuff kicks a**. Another one hooked on the stuff. I think I'll give him the Sennheiser 448's to really set the...

Quote: Originally Posted by Judge Buff My switch crapped-out tonight... Have you discovered a suitable replacement? I looked on Mouser.com for replacement switches a few months ago and recall seeing more than one that looked like it might fit. I posted a link to it on this site.

Quote: Originally Posted by hepatus1234 Hi I just got a bravo V2, which comes with a 12AU7 tube. I don’t know much about tubes but I have read that 12AX7 are similar but with less gain. Is this true? Can I change the tube to a 12AX7 to reduce the amp gain and get lower output...

I'll probably draw the wrath of the headphones gods here for this post, but I just tried my JDS Labs based CMoy with an external 12V battery pack with my K702 and it drives them with some authority and sounds good. I think I paid $45 on ebay for the amp and bought a 8 cell AA battery holder to...

Quote: Originally Posted by gurusan Hey guys I just made the discovery that when the amp is cold the caps see over 20V!! Once it's warmed up they see only around 13-14V. So I've since replaced them with some 1000uF 50V Panasonic FC caps I had laying around. When the amp is cold...

Quote: Originally Posted by acvtre The bravo v2 is just arrived and I want tweak it as much as I can. First of all I'd like to try some valves and change some capacitors. What would you suggest to buy? Sencodly I would change the pot with a better one and with more ohms, such as the...

Quote: Originally Posted by enemigo The 6n11 still works (as mentioned ¨,). I'm hesitant to buying more tubes now since the two I've tried are having similar faults. It could be the socket's fault, I'll disassemble the amp and check the soldering joints. K sounds like a bad...

Listening to a new pair of K702s with a newly built M^3. The 702s and the M^3 are a match made in audio heaven. Tried AD8610's and Burr Brown OPA627 opamps. I prefer the 627s sound. I sold my HD600s, not involving although the portable amp was likely part of the problem, I don't think it was up...

Quote: Originally Posted by brendon Hi, I have the opportunity to choose between the following tubes. Please suggest which of them are good - Mullard Made in Great Britain tube Factory Code starts from 'B',* manufactured in Mullard Blackburn factory**Rs.1500 each (only 3 in stock)...

Quote: Originally Posted by oohms The volume control essentially forms an L pad at the input, so by adding a resistor there would preserve the sound characteristics of the amp better.. but the setup would be more prone to noise, than if you attenuate at the output. that could...

Quote: Originally Posted by upstateguy 8610s are the default opamps so it's probably a good choice. Why don't you put it in a cardboard box for the time being and fire it up, it sounds great. USG Well a small USPS priority mail box made a perfect size case for the M^3 and it...

Quote: Originally Posted by oohms Correct me if i'm wrong, but wouldn't a resistive attenuator at the output change the sound characteristics? (since the headphones are an inductive load) you're right. how much it colors the sound depends on too many things to calculate, the...

Quote: Originally Posted by Joe Presto Cheers CPL593H, I did some digging and found the calculator, I was trying to find out how much attenuation I needed, so thanks for your suggestion. I'll build a rudimentary one first and make one out of proper components if it works out. I...

Quote: Originally Posted by Joe Presto Thanks for the link, I'll plough through the article tonight and see if I can build it! Here's a schematic that the Bravo amp was based on. Component values may be different. That article I posted is too difficult to deal with. Here's an...

Quote: Originally Posted by Joe Presto You are suggesting that I add resistance to the amp input, so between source and amp, or between amp input and volume pot? I am confused now, and really looking for the easiest way to get my Grado's to a listenable level. I don't think that...