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[Project] Homemade Stereo Valve (Vacuum Tube) Amplifier - Page 5

post #41 of 68
I definitely want to see a test video of this in action.

I wish I had the tools/knowledge to do the stuff that you are doing here, Id love to make an amp.


very nice thumb.gifthumb.gifthumb.gifthumb.gifthumb.gif
It looks really good
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post #42 of 68
This project is amazing!
     
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post #43 of 68
Thread Starter 
Quote:
Originally Posted by Truedeal View Post

I definitely want to see a test video of this in action.

I wish I had the tools/knowledge to do the stuff that you are doing here, Id love to make an amp.


very nice thumb.gifthumb.gifthumb.gifthumb.gifthumb.gif
It looks really good

Quote:
Originally Posted by debuchan View Post

This project is amazing!

Thanks guys!


Had a lovely afternoon in Bristol,

Now I'm home it's time to get to work on the wiring!



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post #44 of 68
wow, no rain! no rain in the UK! wink.gif

So what are the red and green things? And what do they do?
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post #45 of 68
Thread Starter 
On the drive home there was a thunderstorm which cleared up about an hour later.

Those are potentiometers. Like what you see in a fan controller, a variable resistor.

Red: volume control, one from left speaker and one for right. This is because this us two seperate amps which drive each speaker to give stereo.

Green: tone control, one for treble and one for bass.
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post #46 of 68
aha, you gonna keep them like that or add turn-counting dials to them?
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post #47 of 68

I'd say it's best to add dials just so you can get a visual of where you have the pot adjusted to. That's really aesthetics tho.

 

Great update bro. Enjoyed the pics so much it actually took my mind off my own issue's for a cpl seconds. This really is a sick mod you're putting together. Much more interesting than just a standard casemod

 

Anyway, back to being grumpy for me. Keep up the great work!!!

    
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post #48 of 68
Thread Starter 
Quote:
Originally Posted by SortOfGrim View Post

aha, you gonna keep them like that or add turn-counting dials to them?

Quote:
Originally Posted by kpoeticg View Post

I'd say it's best to add dials just so you can get a visual of where you have the pot adjusted to. That's really aesthetics tho.

Great update bro. Enjoyed the pics so much it actually took my mind off my own issue's for a cpl seconds. This really is a sick mod you're putting together. Much more interesting than just a standard casemod

Anyway, back to being grumpy for me. Keep up the great work!!!


Recovered these nasty things from one of the donor radios. I plan on sanding and painting them or whatever.



Also the power supply section is wired up (with the help of dad biggrin.gif )

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post #49 of 68
Thread Starter 
Well it was a long day of working on the amp yesterday. I intended to post this update last night but it was 11:30pm when I gave up and went to bed.

I got the entire amp wired up, switched it on.... No smoke, fire, sparks. Okay that's good.

The valves warm up nicely and a horrendous hum develops. Ahhh @#*@*##*!

After plenty head scratching I disconnected the base and treble pots, and used a single ECC83 to the volume controls.

Less of a hum, that's good. Not good enough yet.

Rigged a quick input line and plugged in my phone. Played some music, low output, distorted. Even more @#**#@#&.

Tested some voltages, valve bias is wrong. My dad managed to figure out a fix, switched it on, the hum is back...

Poked around with a screwdriver, found that the mains transformer hadn't been grounded properly! Set to work rectifying that.

Switched it back on, slight hum, much better. More than acceptable as you won't be able to hear any of it when it's playing audio.

Hooked up the input line again, music plays. Great stuff! Sounds very nice and smooth, the tone seem just fine too, since I don't have any tone control right now.

So I set about hooking up all my inputs and outputs, and switches for them.





The switch is used to switch between outputs, one way will play the audio through the speaker panel, the other through the 3.5mm jack.

Done


Blurry photo sorry, it was really late at this point. Here you see the thick white cabling, that is screened stereo cable so that I don't pick up hum as it makes it way across the chassis past components.



After finishing both switches connecting the inputs and outputs I hooked it up to the mains, plugged in my phone through auxiliary cable and plugged in two speakers, time to test both amps at the same time!

Plugged in, switch on, music sounds great, I started to adjust volume of each speaker individually, hang on. One volume control set one speaker going fine, the second one altered the same speaker and distorted it like hell.

This was the point I went to bed, no rational decisions can be made with the tiredness.

Came back to it this morning with my dad, he discovered one of the 0.05 capacitors is pretty much dead, he made a slight adjustment to the circuit and I tested again, great sound through both speakers and independent volume controls working correctly!

Right now I'm just happy that it works. Several points I thought this entire project was going to fail.

Next steps are to get the tone controls included to the circuit and replace the dying capacitors.

When I bought a load of specific resistors needed from maplin it turned out half of them weren't rated nearly as high as I needed them, that's why you can see a lot of reused resistors from the donor radios.

Maybe in the time I have it at him I will cosmetically clean it up, I'm thinking a brushed finish on the chassis and need to cut down the length of the pots, clean up and paint the knobs, and so forth.

Now I'm travelling home (via my girlfriends) so when I get home tonight I will rig it up and do a video for you guys! thumb.gif
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post #50 of 68
cable jungle galore :/

And that will be the reason I won't build an amp.

But that being said, specool.gif !
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