I want to spend the minimum :-) In the other hand, the most expensive is to buy something I do not use. Will have a look az the HD25 next time I'll be at a sennheiser distributor. It is a bit more difficult to try a beyerdynamic, but I want to hear. From the pictures I do not know how big it...

Hello, thanks for your response. I have tried the 3 isolation rubber which came with the CX300, also, I had tried a Shure IEM also, which had a special memory foam. I did not like them at all. It is not just the sound. My main issue with the CX300 is comfort. Also, it gets out of my ears too...

Dear All,   You guys helped me before in some questions. For headphone listening to music I've a quite good system now, an AD1865 based DAC, an OTL SE triode amp, and still my old sennheiser ovation 595. I'm thinking about a HD800, but disappointed on the HD600/650. I listen to classicals...

Hello,   I have a HD565 and want to upgrade also. I have it for a long time now. Some years ago, headphone for me was not that important as nowdays. I listen to music more ans more with headphone. Years ago I planned to upgrade to HD600 and had a friends HD600 for a few days. From the...

for the first sight it seemed a lot. 5V when we make DC servo on solid state amps to correct down to mV range. In the other hand, I have just calculated, 5V on 200ohm is only 25mA and the coil dissipate only 125mW. Does not seem much at all. Unfortunately I have no cheap high impedance...

I made a DC recording of a switch on - off cycle onto a 200ohm resistor at the output. 4.x V DC appear for seconds. Regards, JG

Hello, I do not like the idea of parafeed output transformer. I accept transformer in the end of my speaker amp, but there it handles DC current all the time, so it runs on something like 0,8T and swing +- like 0,5T on audio signal. This way no flux direction change applied and trafo is used in...

I'm reading different ideas on will a class A OTL amp damage a headphone any way or not ? I have a prototype style single ended class A with a 680uF cap at the output, I just love the sound of it. So far the only protection I made is I soldered 100ohm resistors on the output the way that when...

I would agree in theory but if I would believe measurements and theories only, I would just make a strong opamp amp :-) Yet I did not found anybody who compared 2 and 3 channel version. All post I found so far just believe active ground is better.   Also, If the amp has so good immunity to...

Hello,Thanks for the reply.Maybe there is a misunderstanding. I do not plan to run speakers on it at all. Without that, 200mA is not huge, but rather small. Standard and cheap 7Ah SLAs (4x) will do it fine. If I calculate that I take out half the capacity by 3 boards, that is still nearly 6...

Hello,   I have some b22 question and I do not really know where to post it.   First, how it sounds like ? I found a lot of people ranking it to top headphone amp, but I cound not find how ?   I like the single ended class A triode power amps, because of the great balance between...

well, I'm changing the scope now.   I do not want to sacrify the quality on the 180ohm+ impedance headphones just for being able to drive a 32ohm headphone. I drop it out, I do not think I will by a grado, so I start from 180ohm now.   What I see now -Andrea's project with LL1689 (my...

LL1689 looks better for sure, but in the Andrea Ciuffoli's designs, it goes down to 150ohm, which is still not enough for me.   There are commercial amps, like woo audio 6, which drives low impedance headphones. No one DIY design ? I'm not good in tube circuit design to do it, I'm looking...

Hi,   I'm looking for advises what next amp should I make.   I have a good DAC, new RIAA is ongoing for my turntable, I listen to music through 2A3 PSE amp and AN E like speakers ... when I can. Unfortunately, I rarely can. Family sleeping in the next room, my daughter watch cartoons in...

I would have another CK2III question.   I build this amp and like it very much, if .... if it is warm already. In the first hour it does not sound good. This is very annoying for me. I do not want to leave it on, but can not wait one hour either. 5-10min would be O.K.   Do you have...