2 watt Trainwreck 4 4 0 ax84.com no standby sw

[mehfuzhoss]

Hello,

Im new to building amps. It has no standby switch in the layout but i have seen in the forums that most of you who built 4 4 0 has a stand by sw added.

Now lets assume that i wont need the standby. I have 4 wires to connect to he power sw. Plz See attached photos.

I will solder the black and white wires (coming from PT) to the middle two pins.

And the blue orange wires (coming from the fuse) to the top two pins.
And leave the bottom two pins u used.

Am i correct?

Thanks

[MakerDP]

No that will not work. It's not wired correctly at all.

What does the layout tell you? What does the schematic show? In this case, the schematic is the more clear place to look.

(I'm not trying to be mean or evasive, I'm a teacher and sometimes the best way for a student to learn is to answer their question with a leading question...)

Follow the colors of the wires on the layout from the iec to the fuse to the switch... how is that different than what you have in the photo?

[MakerDP]

ooops dbl post

[pompeiisneaks]

Also it's not a trainwreck as was stated in the other thread. I don't know if many here have built that specific amp, since this amp is more focused on dumbles and trainwrecks, but since we're mostly builders many may have.

Edit: additionally a standby switch is never needed anyway, and is often misused and can hurt filter caps and/or rectifiers due to being huge on inrush current.

~Phil

[mehfuzhoss]

Sorry for being so stupid. I am still learning about electronics. here is a diagram that i will use for the power switch connection. let me know.

Thank you.

[Colossal]

Sorry for being so stupid. I am still learning about electronics. here is a diagram that i will use for the power switch connection. let me know.

Thank you.

No buddy, that won't work. You want your fuse on the LOAD side only.

Like this:

PT Wiring.jpg

[MakerDP]

your'e learning... not stupid.

this is not an easy project to start on. Have you considered starting with a well-documented kit build first? Something that guides you step-by-step through your first amp build is a VERY powerful learning tool and a gateway.

[MakerDP]

also, you should stick with one thread per build and just keep adding your questions there instead of a new thread for each question.

[mehfuzhoss]

Thanks Collosal. The sw im using has 6 poles. I used your layout and left bottom pair unused. I powered the amp up and right away the 1amp slo blo fuse went sparked. Im getting the fuse fixed tomorrow lets see....

Plz look at the attached pic of the sw im using.

Thank you.

[Colossal]

Thanks Collosal. The sw im using has 6 poles. I used your layout and left bottom pair unused. I powered the amp up and right away the 1amp slo blo fuse went sparked. Im getting the fuse fixed tomorrow lets see....

Plz look at the attached pic of the sw im using.

Thank you.

Your switch is DPDT on-none-on. If you blew the fuse (and I'm sure it was an impressive flash), then you did not follow the diagram (or some other part of your circuit is at fault). Be very mindful that you can be hurt or killed working with tube amps, so if you do not understand where you are and how to fix this issue, you need to pause and seriously consider getting local help. If you want to make things easier for people on the forum to help you, please post clear, well-lit photos of your build. Because you draw something one way does not mean you actually wired it that way, so photos help. Please carefully study the drawing above and make sure you understand how things are to work. One of the basic skills you must have, is to be able to look at a schematic and a layout and recognize each part. You will not get far fumbling around and trying to solder by numbers via a layout.

[MakerDP]

Even though I have done this quite a bit, I still follow this guideline RELIGIOUSLY every single time I start an amp for the first time... it has not failed me yet...

https://paulrubyamps.com/info.html#FirstPowerUp

But, I am also going to humbly suggest that you stop what you are doing, set this project aside and get yourself a well-documented kit for your first build. The experience you gain, even if it is a bare-bones 5e3 circuit, is huge. Use a highlighter and highlight what you do on the layout AND the schematic. Like Colossal said, being able to read both, especially when you are stuck, is essential to your success in this hobby.

I can highly recommend these kits... http://www.trinityamps.com/kits/ Start with a Trinity Tweed or Tramp. The documentation is step-by-step and very thorough, with clear safety explanations, startup procedures, troubleshooting guides, etc. Worth every penny and the experience from doing it even once will put you on the right path to go back to the 4-4-0.