Laowei Posted February 20, 2019 Report Share Posted February 20, 2019 Keeping paperwork updated can be a major PITA. Especially projects strung between separate people. Thanks for clearing it up, and making your mini T2 available to us DIYers, Joachim! Quote Link to comment Share on other sites More sharing options...
JoaMat Posted February 20, 2019 Report Share Posted February 20, 2019 11 minutes ago, JoaMat said: (I hope, crossing fingers). Oops. Schematic posted above uses 2sa1486 in the current tunnel – my first boards had the 2sa1486. Schematic in the link uses twin ksa1156 in the tunnel and the boards have the twin ksa1156. The boards Micheal and Jose have had made are created from the linked schematic. 1 Quote Link to comment Share on other sites More sharing options...
mwl168 Posted February 20, 2019 Report Share Posted February 20, 2019 All mini T2 boards I have are spoken for. Thanks! Quote Link to comment Share on other sites More sharing options...
JoaMat Posted March 4, 2020 Report Share Posted March 4, 2020 OK, time to bring this thread up on the first page. I think this is one of the most interesting threads after “The ultimate DIY? A Stax SRM-T2!“ (alright, there are lots of interesting things on HeadCase). Here Kevin introduces GG, sandwich, DHT, T8000DR etc., etc.. Quote Link to comment Share on other sites More sharing options...
JoaMat Posted February 17, 2022 Report Share Posted February 17, 2022 On 9/27/2018 at 11:44 AM, JoaMat said: Have been listen to the new amplifier with EML 20B v4 tubes for a couple of days. Since 20B pinout and heater voltage differs from EL34 I use adapters. Maybe it’s about time to make a board dedicated for the Emission Labs tubes. The tubes looks amazing and have printing on the glass. In this early stage layout the printing and the front of the tubes are facing the listener. I found the big tube 3D model (300b) at grabcad.com, done by Andrew Whitham, United Kingdom. Slow progress, but finally I have something. mini T2 with Emission Labs tubes. It passed all tests in Proteus so it should work. If it blows up, . That must not happen. 7 Quote Link to comment Share on other sites More sharing options...
JoaMat Posted April 16, 2022 Report Share Posted April 16, 2022 mini T2 with Emission Labs Directly Heated Triodes. It didn’t blow up. Left channel offset servo didn’t work so I replaced its ksc2690 with a 1K trimmer. GLAD PÅSK! written on the copper clad is Swedish for Happy Easter! 9 Quote Link to comment Share on other sites More sharing options...
Kerry Posted April 17, 2022 Report Share Posted April 17, 2022 Very nice and GLAD PÅSK! Quote Link to comment Share on other sites More sharing options...
JoaMat Posted April 9, 2023 Report Share Posted April 9, 2023 (edited) Happy Easter folks! Three months ago I bought a pair of Russian 300B. Intention was to try them in an electrostatic amplifier. Eventually I’ve put them in my DHT mini T2. Only mono version but it works. There is some unwanted hum/noise. Maybe because 5VAC for filament. I’ve DC alternatives, so future will tell if that might solve the issue. Anyhow, I’m enjoying the music (only left ear) and I still have some good stuff left. Edited April 9, 2023 by JoaMat 4 Quote Link to comment Share on other sites More sharing options...
JoaMat Posted April 9, 2023 Report Share Posted April 9, 2023 Think I prefer stereo. Moved the 300B to a T2. Left channel has EL61 with adapters from China and right side has 300B with homemade adapters. Works all right. 4 Quote Link to comment Share on other sites More sharing options...
JoaMat Posted April 9, 2023 Report Share Posted April 9, 2023 8 hours ago, JoaMat said: There is some unwanted hum/noise. Hum/noise disappeared after an hour. I’m a bit surprised but I can’t hear it any longer. 1 Quote Link to comment Share on other sites More sharing options...
spritzer Posted April 9, 2023 Report Share Posted April 9, 2023 If these were new tubes, then that can happen. Quote Link to comment Share on other sites More sharing options...
JoaMat Posted April 9, 2023 Report Share Posted April 9, 2023 Yes, they were new. Thanks for feedback. Quote Link to comment Share on other sites More sharing options...
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