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[Project] Homemade Stereo Valve (Vacuum Tube) Amplifier - Page 3

post #21 of 68
Thread Starter 
Lunchtime update!

Worked on the chassis today.

Photos quickly taken with my phone (GS4) whilst I go along.

Lets get started, sheet of 16 gauge (I think) aluminium, ruler, makeshift scribe, tape measure.



Scribed up to bend



Putting this old thing to use.


Aaaaaand bent!







Time to fit the power light. Simple enough, Small pilot hole then again through with the bigger drill bit.



Fitted!


And from the inside


Now to fit the speaker output panel, drilled some holes into the slot area and started to file


Progress


Test fit



Left screw hole was a little off so I filed it inwards slightly, prefect fit now



From the inside
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post #22 of 68
Bend it like wthenshaw specool.gif

Looks like you've been having some fun today, on a manly metal bending mission. That thing looks that old, it should have made in England stamped on it somewhere. Eee thee dun mack um like tha used to.Have fun thumb.gif
post #23 of 68
Thread Starter 
I'll have a gander tomorrow for its manufacturer stamp thumb.gif another update incoming!
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post #24 of 68
Thread Starter 
Here we go:

ANOTHER HOLE? WHAT COULD THIS BE FOR?

Found this neat little switch to use as the on/off switch. Has a nice solid clunk as you toggle it.

YET MORE HOLES?!

This turned out to be for the phono input, lots of little odds and ends I found useful in my dad's "electrical drawer" at work.

Couple shots of the power indicator with a torch to illuminate.


Testing the donor radio/amp!

Happy to see this picks up signal well and drives the speakers (temporary, for testing purposes) well.
]
Shot of the EL84s glowing
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post #25 of 68
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Another update scheduled today, along with fitting some more parts I picked up at the car boot sale this morning.

Found a cheap Decca DMR 88 which should have a similar circuit to the donor radio (Decca SRG 707) meaning more parts to source.
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post #26 of 68
Thread Starter 
Update time, this is actually what I got done yesterday at work, got some more done today, but I'll post that later biggrin.gif
mock up for the transformers

drilling holes and fitting




Cut holes for a couple valve bases


More holes, done using this nifty tool!

Couple grommets here for the wiring to the sound output transformers


Cutting yet more holes, this time for the treble and base control


couple shots of the underside as it stands currently




Another update may come tonight biggrin.gif


Any feedback guys?
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post #27 of 68
The wires look dirty and old...lol


What did you use to make those circles in the metal?

Also, maybe I missed it, but why are you using so many transformers for one amplifier?
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post #28 of 68
Now let's attach a flux capacitor! tongue.gif Nice project!
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post #29 of 68
Thread Starter 
Quote:
Originally Posted by Truedeal View Post

The wires look dirty and old...lol


What did you use to make those circles in the metal?

Also, maybe I missed it, but why are you using so many transformers for one amplifier?

I'm going to clean up the wires or re do them, I took that unit as a whole from the donor radio.

I can't remember the name of the to, but it's basically a blade type block of metal that sits under, and hollow cylinder at the top and you wind up the bolt with the Allen key and it creates a clean circle in he metal.

The three transformers I am using are for (the large one) main transformer and the two smaller ones are sold output transformers. There are two output transformers because this is a stereo amp, which consists of basically two seperate amps which meet up at the output. This means that a balance potentiometer is essential to get the two amps to play equal volume.
Quote:
Originally Posted by SpeedyVT View Post

Now let's attach a flux capacitor! tongue.gif Nice project!

Thank you, and welcome to my log.
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post #30 of 68
okay, I'm here.. finally.

it looks old skool but it will be new? Will you add bluetooth/wireless/mp3 support?

edit: will you show those transformers or are you make covers for them?
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