Resistance Checks [resolved]

[thoven0215]

When doing the resistance checks I noticed that all the checks on the left side of the board went ok, but almost everything on the right side measured as infinity. 15, 16, 17, 18, 36, 37, 39, 40 all measured as infinity. I reflowed the solder joints to no avail. What should be my next steps? Thanks

 

[thoven0215]

Here are some pictures.

 

[Paul Birkeland]

When the manual says "attach", that means you need to physically attach a wire or component lead to a terminal strip.  Your build is very unlikely work if all those connections just pass through a terminal strip or tube socket and don't bend up at least, if not up and around the terminal.  You need to go through your build and do that to every single connection before thinking about turning it on.

Terminal 5 wires to terminal 8.  Terminal 8 wires to terminal 13.  Terminal 13 wires to terminal 16.  These wires all appear to be there but if there are soldering issues that could be discovered in the resistance checks.

 

[Doc B]

https://forum.bottlehead.com/index.php?topic=13797.0

 

[thoven0215]

I attached them and soldered again, but I still get infinity for the same terminals.

 

[Paul Birkeland]

They are wired together.  Wires are 0 ohms.  If they are wired together, you'll get zeroes where you're supposed to.  If you have flaky/broken connections, you won't get your zeroes.

 

[thoven0215]

I'm not exactly sure what you mean. I get all the 0s where I am supposed to, it is just that I get infinity for a lot of places that shouldn't measure at infinity.

 

[Paul Birkeland]

16 and 18 are supposed to be zero and you listed them as infinity.

 

[thoven0215]

I am very confused on how this happened but after measuring again everything just resolved itself. Thank you for your help Mr. Birkeland.

 

[thoven0215]

My fuse ended up blowing. Do you have a recommended replacement, or can I just buy any 1.5 A fuse off the internet? Is there a specific area I should be looking to correct the fuse blowing? Thanks.

 

[Paul Birkeland]

Your power supply diodes are installed backwards.

Any old 20mm 1.5A fuse should do the job.

 

[Thermioniclife]

Good catch P.B.

 

[thoven0215]

I replaced the fuse and went onto testing voltages, but when I got to terminal 27, there was a big pop noise and something bright. I disconnected the power. I noticed the tubes still glowed, but the measurement on everything went to 0 volts. The fuse is also still ok. What happened?

 

[Paul Birkeland]

You have 0V at terminal 44?

 

[thoven0215]

I have 423 Volts at terminal 44.

 

[thoven0215]

I also notice that the left side of the leds on the pcb did not light up if that helps at all.

 

[Paul Birkeland]

OK, so the measurements on everything didn't go to 0V

You'll need to do a whole voltage check and just let us know which terminals are 0V.

 

[thoven0215]

Terminals 1, 2, 6, 7, 21, 22, 24, 25, 27 all shouldn't measure at 0 but measure at 0. I also measured 41-45 and 41 comes at 0 as well.

 

[Paul Birkeland]

Does 34 provide a proper measurement? How about 30?

 

[thoven0215]

30 measures at 425, which is about 7% more than the 398 listed. I just attempted to measure 34, and the same pop happened. I just turned off the amp.