Single Ended headphone amplifier with 5842 triode (5)
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The connection to ground of the shield. If you clean up the mu-metal it can be soldered. Magnetwire is insulated with enamel that's easily removed by heating using the soldering iron. You can smell it burning away; be sure to clean up your soldering iron afterwards! |
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The power resistors in the second pi-filter can be mounted from elco to elco. From these elco's the wiring is led from the GE paper-in-oil to the primary of the outputtransformer. I recommend leading the wires from component to component, forcing the B+ to actually see each component! |
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The kathode resistor of the 5842. These are two 50ohm carbon resistors placed in series. My favourite type, tantal, was sounding a bit harsh in this set-up, the carbons are here the way to go! |
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The 5842 has 4 connections to grid. To prevent nasty hf-influences, I placed a 150ohm blocking resistor on each grid. Those must be seen as parallelled. Again, a not connected socket terminal is used as solder terminal. |
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Upgrading in the near future? Replacing the BlackGate 22mF/350V VK for the JJ's and the GE paper-in-oil by the BlackGate 67mF/350V NH could be worth the money.... |
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Glowing... Nice reflections by polished copper... |
Addendum: The value of the paper-in-oil is dependent and interactive with the 5842's plate resistance and primary impedance of the output transformer. My tone generator is broke, so I tested the low-end response with a test cd: 30Hz came out normally... I'll lend me a tone generator and put here the frequency response in time....
Advice: Make the chassis a little bigger than the 27x35cm I used here.... This will spear you the hassle in keeping hum interferences from the outputtransformer. If the outputtransformers are place in front of the 5842, no hum of any kind is suspectable.
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