[Interested in getting started with DIY builds, don't know where to start]

Thank you! That's super helpful. I'll look into that then. It'll be a little while I think but I will definitely try to give back as much as I can.

[Interested in getting started with DIY builds, don't know where to start]

Hi all, I've been more and more interested in building my own amp after having built a relatively simple Elekit amp. I've been reading through the KGSSHV and KGSSHV Carbon build threads and I think I've found the google drives for the schematics and various documents, but it's still a bit confusing where to begin, and I'm not entirely sure I should jump right into trying to build a KGSSHV Carbon. I'm also unclear where one sources the PCBs for any of those builds - seems like various members hold extras and there are some floating around on eBay of dubious origin.

Anyway, I'm not exactly certain what build would be good to start out with, or what the differences are between the various builds, or which ones (besides the Carbon) still have active support around them. Could I get a little bit of direction of where and how to start? I do have soldering experience and I know my way around a multimeter. I don't mind RTFMing - just can't seem to find the manual to begin with!

[STAX SRM-007t Transformer Help]

thanks so much mach3!

[STAX SRM-007t Transformer Help]

thanks all for the help!

4 hours ago, n_maher said:

I was thinking this and one does look a little domed in some of the pictures.

which one? i'm afraid i've little experience with caps; the big brown ones seem like they're doming a little bit.

3 hours ago, kevin gilmore said:

you better take a real good picture of the voltage selector block. there are many different kinds.

if blue and purple are jumpered together then its 120v

if brown and green are wired together its 100v

white should be wired to grey

the correct fuse for 100v should be 1.5 amp

 

 

 

looks like they're all hooked up to the voltage selector, and the ones with fuses in them - 1 and 3 - are wired to brown and green, so i guess i just need to change the fuses? that'll be a good deal easier to work with 😅

 

are there any recommendations for cap replacements? i've done through hole soldering before but never done any sort of replacement for electronics like this; looks like i've got 400v/220uf big brown caps and a handful of small 35v 10uf. i can't quite make out the two middle caps, but i'll find out once i get them off the board i guess never mind, they're 35v 470uf   

[STAX SRM-007t Transformer Help]

Hi all, I was advised by some head-fi members to inquire about the technical aspects of this amplifier here. Do let me know if I'm failing to follow any rules; just trying to avoid any catastrophes!

Here are the photos of my amp: https://imgur.com/a/sshHA7B

The amp is an 8FQ7 SRM-007t rated for 100v 50/60hz outlets. I have a step down transformer (PowerBright) rated for 120v to 100v, and my outlets are, I believe, 120v at 60hz (American). The transformer works fine with my Japanese SRM-252S, but the fuse has blown 3 times now when turning on the 007t (always the 2nd time it turns on; the first time seems to be working). I've tried debugging this for a bit, hence the 3 blown fuses, but I'm not too sure why since the 007t is rated for 100v in and the transformer is rated for 100v out. Birgir kindly helped me debug this somewhat and believes that the most likely culprit is a short somewhere on the board, but I'm fairly inexperienced with more complex circuit boards and having investigated every individual trace on the board could not find anything that looked like a traditional short. If I'm being honest, the board looks relatively pristine if a bit dusty, which I'm trying to clean myself; could anyone help me figure this problem out?

The fuses are 1 Amp / 250V 5x20mm, unbranded. I've since bought a handful of extras from a different brand but haven't yet tried them with the 007t. The tubes look to be vintage GE 8FQ7 / 8CG7 tubes, which are apparently the original tubes the amplifier came with, so I am fairly certain that they're not the problem, but I might have to rebias them as it's quite old. There are 3 red lights in the case and the power button is red; I'm not too sure if the lights indicate anything out of the ordinary.

Thanks in advance!

E: As far as I can tell, the wiring is for 100v; the fuses are in the 1,3,6 positions. I'm not entirely sure about the colored wires coming from the transformer inside the amplifier, though.