![]() I will tell you that the circuit performs flawlessly as low as about 30Ω, but I haven't tested it any lower (See my build here: The Recovery).įrankly, I would strongly suggest that you look at output transformers for a 16Ω headphone. The Chu Moy design over at HeadWize ( The Optimized Morgan Jones Amplifier) may drive your phones but it may require some tweaking. I will tell you that a 16Ω load is low even for a White cathode follower. This is commonly referred to as a White Cathode Follower. This active load is tied to the output tube in such a manner as to vary it's plate cathode impedance such that it remains in balance with the driver tube. In order to drive very low impedances you really need an active load on the output stage. This does reduce the static output impedance, but the resultant stage has severe drive limitations and poor distortion characteristics. In the past some have taken to paralleling large numbers of these stages in an attempt to drive down the output impedance. Most of these amplifiers are restively loaded cathode follower stages. My headphones are 16 ohms, is there anything I can do to decrease the output impedance?Yes. which basically does what I wanted to do ( a cheap tube headphone amplifier) except the author says it works up to (or down to) 32 ohms. Does anyone have the schematic of the bottlehead crack? It almost seems like nobody wants or dares to post it, but especially the powersupply section seems interesting to me. How did they build the power supply for the crack amplifier? I can't find any schematic for the bottlehead crack, but it seems to be a variation of Can I put two 6080 triodes in parallel to decrease the output impedance in order to drive low impedance heaphones? Like literally connecting pins 1-4, 2-5 and 3-6 together The questions that arose from this are maybe easy for the experts around here to answer: the tubes they use are quite cheap, around 20 euro for two 6080's No output transformer, okay they are designed for 120 ohms and higher impedance headphones but still quite a nice idea. They don't appear to be using a choke in the B+ line, something I see most of the time with other tube amplifiers. I stumbled onto a build log of an Bottlehead OTL crack headphone amplifier. ![]()
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