Mar 18, 2022 · Is there a published STAX amplifier/bias schematic to "study"? You definitely need a 5M resistor in the path to limit the current flow. Exactly, 5M resistor needed. And I will follow what Kevin Gilmore is saying above. You must log in or register to reply here.

Oct 12, 2015 · In my powered Stax converters, which run off 117V, the power cord actually goes directly to the bias circuit with only a 0.3 amp fuse as protection, but using an additional transformer as spritzer suggests is much safer.

Jun 3, 2022 · If the transformer outputs 435VAC, you will have a standard 580VDC pro bias. because there is no voltage regulator, the turn ratio of transformer will be conservative for wider range of voltage fluctuation.

Mar 1, 2025 · The link below is the Stax energizer using Lundahl PP TX that I built with a pro-bias circuit. The only change was I didn't use the Lundahl power transformer or the oil caps, I used a magnetically shielded toroid TX m...

Jan 17, 2014 · What follows is a description of how I changed and adjusted the tubes in my personal STAX 006t II vacuum tube amplifier. The tools I used were a philips screwdriver (to remove the cover), an insulated (plastic) slot head screwdriver (to adjust the internal potentiometers), and a good quality multimeter that is set to measure volts .... NOT AMPS!

Mar 14, 2013 · Recently I have been trying to work on a very cheap stax amp that aims to drive electrostatic headphones. Thanks to the help of the headfiers here, especially to Frank, who offered to send me the 6pin female connectors for free.

May 28, 2006 · As far as I know it is possible to convert a 230V bias energizer to a 580V bias one. Here are some photos of the SRM-1/MK2 . The blue cable in the 2nd photo is marked as Bias on the PCB.

Jun 4, 2010 · This article will outline how you can change any normal bias driver into a pro bias, or even up the bias into the 620V bias often recommended for the Koss ESP-950. The tutorial is also applicable on other normal bias Stax amplifiers.

Jun 6, 2020 · I am trying to bias a STAX SRM T1, the old version of STAX SRM T1 with 2 transformers. I am trying to bias the T1 Right Channel with my multimeter, I observed the voltage while biasing, fluctuates from -5 to 600 VDC. I proceeded to adjusted the trimpot to stop this fluctuation to no avail.

Nov 8, 2015 · STAX clearly states on the Operating Manual for the 006t II that “This product operates with a high voltage. It is extremely dangerous to attempt to dismantle or modify the unit in any way, and under no circumstance should any such attempt be made.” What I have done has clearly violated the manufacturer’s warranty – YOU HAVE BEEN WARNED!