Jump to content

Closed - SRX Plus board set Group Buy


mwl168
 Share

Recommended Posts

A few of us over at another thread started by Blueman2 are contemplating getting SRX Plus PCBs fabricated. See this thread: http://www.head-case.org/forums/topic/12445-plan-to-build-srx-where-to-find-bom-boards/

Discussion of the SRX Plus design can be found here: http://www.head-case.org/forums/topic/11996-srx-revisited/

I've checked with PCBNET and we can get the cost the amp board to $25 if we order at least 15 boards. The board will be 2mm thick with 3 oz copper, the board size is 9.35" x 6.85" ( 2 channels on one board ).  Kevin has recently updated the board with teardrops enabled. We have not decided on the PS to use yet. The SRX Plus needs a +/- 340VDC and -20VDC supply in addition to filament supplies for the 12AT7 (x 4) and 6SN7GTB (x 2). JimL is working on a PCB of the shunt regulator he used and published on Audio Xpress. I think a GR HV configured for those voltages will also work.

No promise, but if we have enough interest to start a GB, I will run it following similar process and logistics as we did on the Carbon GB earlier this year.

Please state the number of boards you like if you are interested as well as your thoughts/preference of the PS. If we cannot reach consensus on the PS to use I am inclined to confine this GB just to the amp board.

Thanks and Happy Holidays!

EDIT 1/9/2015:

Kevin has laid out a PCB for the shunt regulator JimL designed for the SRX Plus and added the 580VDC bias. The PSU board measures 8.9" x 5.05" and requires off-board heatsink. I have also upgraded the boards to 2mm thick and 4 oz copper.  The amp board will be $25 each and the PSU board $20 each PSU if we can reach the quantity of 20 boards each. 

Here are the board counts:

MLA: 2 AMP 2 PSU

UFN: 1 AMP 1 PSU

blueman2: 2 AMP 2 PSU

gepardcv: 1 AMP 1 PSU

jose: 1 AMP 1 PSU

palchiu: 1 AMP 1 PSU

charlo89: 2 AMP 2 PSU

DefQon: 1 AMP 1 PSU (please let me know if your friend is interested and how many)

JimL: 2 AMP 2 PSU

sorenb: 2 AMP 2 PSU

mwl168: 2 AMP 2 PSU

eggill: 1 AMP 1 PSU

Samsie: 1 AMP 1 PSU

b0bb: 1 AMP 1 PSU

GeorgeP: 1 AMP 2 PSU

Rodeodave: 1 AMP 1 PSU

Bdrew: 1 AMP 1 PSU

Edited by mwl168
  • Like 1
Link to comment
Share on other sites

2 hours ago, gepardcv said:

If we go with Jim's PSU, should the GB also include a bias power board?

Agreed.  I am still torn between the StaxPlus PSU and the KGBH PSU.  I prefer to go with whatever is smaller and easier to build/buy parts for.  But I will absolutely commit to 2 sets of whatever boards are in the GB.  

Link to comment
Share on other sites

Here is the count of sets of boards so far. Please correct or update.

Looks like we have enough for a GB. I will get quote for the PSU board and report back with cost.  

Each set will be one amp board and one of JimL's shunt regulator board with bias circuit added. 

I will also change the title of this thread to indicate that we are moving forward with a GB. 

 

EDIT 1/10/2015: List of GB participant and board count moved to first post.

 

Edited by mwl168
Link to comment
Share on other sites

I received quote for the PSU and response to an upgrade inquiry yesterday.

We'll be able to get one set of amp + PSU boards cost at $45 US with 2 mm thick PCB and 4 oz copper.

I have visually traced the PSU board against the schematic JimL provided. It looks good to me but additional pairs of eyes to verify will be great and much appreciated.  

Edited by mwl168
Link to comment
Share on other sites

I moved the board count to the first post for ease of access.

Also, there are requests on the other thread to not have to order the AMP and PSU board in sets. That's no problem with me. We just need to keep in mind board cost is affected by quantities fabricated. 

Those that like to order different quantities of AMP and PSU boards please state your request on this thread.

I plan to close the GB in the next few days and start collecting payment toward the end of the week of Monday 1/11.  

Link to comment
Share on other sites

On 1/9/2016 at 3:30 PM, mwl168 said:

I moved the board count to the first post for ease of access.

Also, there are requests on the other thread to not have to order the AMP and PSU board in sets. That's no problem with me. We just need to keep in mind board cost is affected by quantities fabricated. 

Those that like to order different quantities of AMP and PSU boards please state your request on this thread.

I plan to close the GB in the next few days and start collecting payment toward the end of the week of Monday 1/11.  

mwl168,

If we end up being below 20 boards on either the AMP or the PSU, I will agree to buy the amount needed to get us up to 20 boards.  Otherwise, I confirm my commitment for 2 of each board.  

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.