Hi all I’m going to build a PPA v2 powered with a YJPS psu and I’d be grateful if you could help me regarding several doubts. 1) I have two unused Black Gate series N non-polar capacitors. I had installed them at the output of a headphone amp but now, with a FET-input opamp in it and very...

Thanks for your response, Ti. Perhaps using in Cbb a very small cap, combined with the 50k log pot as variable Rbb and a gain=2x or 4x, would put the point “Fc”, from which the bass boost takes place, higher in frequency, to around 1k-3kHz. This way the behaviour of the filter is over a...

Hi all. I’ve moved this post to the DIY section of the forum. My apologies for the previous mistake. I’m going to build an AMB M3 Headphone amplifier, which probably will serve also as preamplifier section for a LM3886-based loudspeaker amp. I’m currently using another headphone amp with a...

this post has been deleted here and moved to DIY section

Thank you for your answer, Brian. I'm sure that the Ballsie module will sound a lot better than the stock Denon analogue output stage: better op-amps, independent linear power supply, no caps directly in signal path, no muting transistors, better PCB layout... BTW, in the assembled and tested...

Hi all Although this forum thread is for Opus DAC, I'm going to put here my questions, as I've read several posts regarding the Ballsie module. I’m interested in upgrading my universal Denon DVD-2930 player. I haven’t yet the Service manual for this model (do you have any idea about...

Hi all I’m interested in the Meier passive crossfeed circuit. I’ve made the Linkwitz crossfeed but I’m not using it because it dulls too much the sound and reduces the available volume a lot, although I like the way it places the soundstage “farther” from my face. I have read that the Meier...

Hi I have ordered several times from Welborne Labs and the only trouble I had was because my e-mail address (a yahoo one) was blocked (I don't know why) by some anti-spam filter in their website. Using another alternative (hotmail) address solved the problem. They also have made a couple of...

Hi I’m going to integrate a remote controlled stepped attenuator (a Welborne Labs kit) and an headphone amplifier (WNA) into the chassis of my amplifier (Copland ultralinear with a ECC83, two ECC82 and four EL34 valves). Believe it or not, there is enough space . The output from the...

Hi, I too have a doubt regarding the connection of headphones using 4-pin XLR connectors and not the standard “TRS” phone stereo plug. According what I have read in the internet, a good XLR plug is a better connector than a standard TRS. I have a Grado HP-2 recabled with Moon Silver Dragon...

Hi, Regarding the use of 4-pin XLR plugs and sockets instead of the TRS, the designer of my headphone amp (WNA) and others prefer the XLR always, because according to them it sounds a little better, even in not fully balanced amps. My amplifier is a two-channel single-ended (left and...

Thank you for your suggestions. I think I'm going to use a 5-pin XLR male plug in the headphone cable and a matching latching female panel socket in the amp frontplate. Why 5-pin? Because perhaps I'll use a shielded cable and thus pin1=L signal out, pin2= L ground, pin3=shield, for...

Hi I have a doubt about the virtues of the "balanced" connection for headphones (separate ground for each channel and not the usual tip-ring-sleeve jack). If the amplifier is only "semi-dual mono", with the power tranformer shared between both channels (all the rest is dual: there are two...

Quote: Originally Posted by tomb I am a complete noob on this subject, but I recently purchased a cheap meter just so I could get HFE testing. Steinchen's site for Diamond Buffers on the Millett Hybrid specifically describe cheap meter HFE testing for transistors. So, I think for some...

Hi I’ve used the same Modified Linkwitz crossfeed circuit, built using the PCB Tangent sells (with the rotary switch option between high and low crossfeed settings). However, it dulled too much the sound and in some recordings the soundstage was pushed back too much. I thought the crossfeed...