Leaderboard

Holy crap! Never saw this thread when I was sick. Thanks for the well wishes, guys.

So, having the proper radio can make a difference

Friday Night Sous Vide The vacation starts here

I get logged out all the time too. It started happening with the new forum software update.

Hi, My modem died last week so I'm just getting back on the net and saw this thread. A couple corrections. The articles are in the November and December 2015 issues of AudioXpress. The original SRX circuit is indeed quite spare: 3 tubes, 1 trimmer, 4 caps and 13 resistors per channel. The SRX Plus is more complex: 3 tubes, 8 MOSFETS, 5 trimmers, 4 caps and 35 resistors, but I think the performance takes a substantial jump. See the SRX revised thread and also the Current Requirements in Electrostatic Headphone amplifiers elsewhere in the DIY section for all the gory technical rationale. I am also in the final stages of working up a PCB for the shunt regulator PS. It includes input caps but not the rectifiers, as I intend it to be used with either a cap input (in which case you just need the transformer and full bridge rectifier, or choke input (in which case you need two chokes also), which would be mounted off board. It's a slow process since I am learning to use KiCAD while I'm also doing the board. I've lost count of the number of times I've used Exit without Save when I've screwed up and had to go back to an earlier iteration. I still have to figure out how to do the mounting screw holes and the component mask layer. Currently the board measures about 6.5" x 3.75" and one edge is intended to attach to a heatsink so it won't blow up if all the current has to run through the shunt. BTW if there is a group buy I would be interested in a board.

Rant away Larry. Ultimately it's better to have you here ranting then not to have you here. Only wishing the best for you and your daughter with each new day. And hoping the slogan "no pain no gain" is appropriate, and it means you ARE progressing with PT.

I agree Kevin. After looking at the SRX Plus board I have on hand (thanks MLA). Plus, this is a proven board so I vote to leave it alone. No promise, but if there is enough interest, I'll consider organizing a GB and use PCBNET. I and many others have been very happy with the quality of the boards from the Carbon GB.

the board is 9.35 x 6.85 inches the heatsinks prevent the board from changing that 6.85 inch number more than maybe .1 or .2 inch the 9.35 I may be able to reduce .5 inch but things are going to be tight. neither of those changes is going to influence the board price much. 373 holes

Noted Reks, I'll try to approach the next set differently. It's the look that the ladies wanted. Maybe because they have seen some past images that had the washed out look so it's a cyclical thing. Thanks for the kind words Tyler. I'll see what I can do about the lopsided hair =/ Below is the view from today's shoot location High rise penthouse in Miami.

Well, point to point is cool but board is simpler, at least in my experience. I would recommend the SRX-plus edition, it's a fantastic amp built with relatively few components, so limited things can go wrong, and figuring out how to trim all the current sources to balance everything out is a great learning experience (or at least was for me :)). Since there's only like 13 components per channel for the amp and a similar amount for the PSU, making a BOM is not so complex, and Mouser is your friend in this :). However, If you'd prefer a listing, JimL has a complete component list in his articles on the SRX-plus in Audio Express, the Oct and Nov issues, along with a lot of advice on how to grasp and trim the circuit. Very good read! As for boards, last time I checked making a board run of the SRX plus from Dr Gilmore's gerber files the cost was around 70-80 USD from one the cheaper PCB firms for a run of 5. If more people are interested and if you'd like help on this, I could make a small run for 5-10 boards and ship out, no problem!