Jump to content

Diy Stax-Srd7 for about....hmmm...$20


Recommended Posts

Hello everyone, hope everything doing very well today.

Few days ago I found two transformers in my dungeon, which named by my wife. I mentioned it has 16V out and double 110V in, so I guess perhaps could make something like stax srd-7.

Then I made a pcb and give most places to voltage doubling rectifier, as same as srd-7, and... it works.

Well somehow the bias unable to reach 580V, only around 490V, the sound quality, of course, bass section bit weak, so I have to turn the EQ on, then everything fantastic.






 2 30W transformers 110-0-110 in 16V out, 1 50W transformer 220V in 110V out.

1 fuse @200ma

6 0.1uf 630V caps

1 0.01uf 630v cap

6 1n4007 diodes

4 speaker connectors

2 2M2 resistors @ 2W (for safety consideration no less than 1/2W)

1 15k resistors ( to light up led)

2 5R resistors @5W for dummy load

1 1M resistor

1 stax standard electrostatic can connector

Infact if I could spend enough time on it, hand wired construction must be better and cheaper.

So I call this project "Ghetto SRD-7".





  • Like 2
Link to comment
Share on other sites

Neat!  When you say your bias is only able to reach 490, how are you measuring that?  You cannot just measure with a normal DMM as it's own impedance will give a false low reading.  

And where did you get the board made?  Looks quite nice.  

Edited by Blueman2
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.

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.


  • Create New...