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Vacuum Tube (Thermionic Valve) Fun!
- Thread starter Sigurthr
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Sigurthr
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Hehe, only the fancy items had built in time delay relays! The rest of us had to flick the heater switch and wait before flipping the anode switch!
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Not sure if I posted this before ,
I made a headphone hybrid Tube / Semiconductor amp along with my own PCB layout and board .
IMG_0402[1] by TwirlyWhirly555, on Flickr
IMG_0400[1] by TwirlyWhirly555, on Flickr
Runs from 12V , tube provides voltage gain and a mosfet and regulator in CC provide the current gain .
I made a headphone hybrid Tube / Semiconductor amp along with my own PCB layout and board .
IMG_0402[1] by TwirlyWhirly555, on FlickrIMG_0400[1] by TwirlyWhirly555, on FlickrRuns from 12V , tube provides voltage gain and a mosfet and regulator in CC provide the current gain .
Sigurthr
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I remember you mentioning it but not a photo, nice work! Is that a dual pentode?
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Tube is a dual triode used in preamps , 12AU7
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Made another one in a metal case this time , supply is 12V from 3 LiPo's
IMG_0821[1] by TwirlyWhirly555, on Flickr
IMG_0812[1] by TwirlyWhirly555, on Flickr
IMG_0814[1] by TwirlyWhirly555, on Flickr
IMG_0821[1] by TwirlyWhirly555, on FlickrIMG_0812[1] by TwirlyWhirly555, on FlickrIMG_0814[1] by TwirlyWhirly555, on Flickr
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Hybrid headphone amp V3 - New case , Resistance logo , Orange / black .
IMG_0829[1] by TwirlyWhirly555, on Flickr
IMG_0826[1] by TwirlyWhirly555, on Flickr
IMG_0829[1] by TwirlyWhirly555, on FlickrIMG_0826[1] by TwirlyWhirly555, on Flickr
Sigurthr
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Looks sweet!
aryntha
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ionlaser555, would you be interested in doing a 12AX7 or even more useful-like, a 6BQ7 headphone amp build for someone? I'd be freakin' interested, I-tell-you-what.
Is that one mono-in though? no stereo?
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Thanks : D
Thanks for the offer : ) but Honestly I wouldn't know where to start , The amp I built was from a circuit I copied down a while back , im not that good at doing the valve circuits on my own , I get the most part but im still getting there .
Its a dual triode ( 12AU7 ) to give voltage gain and then a class A Mosfet / LM317 stage for current gain .
The audio is stereo in / stereo out , there are two 3.5mm stereo jacks under the large gold phono jack ( I use that as the 12V supply input )
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A triode is a triode. There are minor
differences, but one tube can generally be
substituted for another. Of course the
audio characteristics will be a bit
different and the tube has to be able to
handle the power.
differences, but one tube can generally be
substituted for another. Of course the
audio characteristics will be a bit
different and the tube has to be able to
handle the power.
Sigurthr
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Yep, as my experiments with the 1927 triodes showed, they're pretty easy to fudge into whatever you want them to do. Pentodes though... there's some witchcraft.
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Well I don't mind trying : ) ,
Random thing I made , Astable 12AU7 multivibrator driving neon tubes and EM87 magic eye tubes : D
https://www.youtube.com/watch?v=flNM0Q8rS-E
https://www.youtube.com/watch?v=eXGulijHwnE
IMG_0831[1] by TwirlyWhirly555, on Flickr
Random thing I made , Astable 12AU7 multivibrator driving neon tubes and EM87 magic eye tubes : D
https://www.youtube.com/watch?v=flNM0Q8rS-E
https://www.youtube.com/watch?v=eXGulijHwnE
IMG_0831[1] by TwirlyWhirly555, on Flickr
djQUAN
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So I installed a new charge controller for my home off grid setup and wanted to test it's capability.
I went and built a tube preamp with the whole workshop running off of wind and solar
Here is the tube pre just completed, doing a quick test before plugging it into my amp.
Here is my bedroom setup. I'm using a laptop with foobar and FLAC files, Schiit Bifrost dac, async USB connection, the tube pre, my DIY lateral mosfet amp pushing 300w/ch into 4ohms, B&W 686 speakers. Silver interconnects and DIY braided speaker cables.
The tube pre on the amp for testing.
Nice glow on the toobs
Sounds pretty sweet. Unfortunately, this build was for a friend. Now I want to build one for myself too.
I went and built a tube preamp with the whole workshop running off of wind and solar
Here is the tube pre just completed, doing a quick test before plugging it into my amp.
Here is my bedroom setup. I'm using a laptop with foobar and FLAC files, Schiit Bifrost dac, async USB connection, the tube pre, my DIY lateral mosfet amp pushing 300w/ch into 4ohms, B&W 686 speakers. Silver interconnects and DIY braided speaker cables.
The tube pre on the amp for testing.
Nice glow on the toobs
Sounds pretty sweet. Unfortunately, this build was for a friend. Now I want to build one for myself too.
Attachments
Sigurthr
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Beautiful build, very sleek! Reminds me of the builds I saw being done during the heyday. I always admired the physical construction skills it takes to mount things so nicely to a DIY chassis.
djQUAN
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Thanks. Took a few more pics. My friend picked and bought all the parts needed and made the chassis. I simply did the assembly and wiring.
The volume control is a stepped ladder attenuator. I forgot what switch was used for the input selector but remember it was an NOS unit. Signal wiring is solid silver wire, ground wire is solid PCOCC copper. IEC connector has solid copper pins
Internal shot of the preamp.
Source selector and volume control
Input and output connectors
Used the extra wires to make short interconnects using WBT tips.
The volume control is a stepped ladder attenuator. I forgot what switch was used for the input selector but remember it was an NOS unit. Signal wiring is solid silver wire, ground wire is solid PCOCC copper. IEC connector has solid copper pins
Internal shot of the preamp.
Source selector and volume control
Input and output connectors
Used the extra wires to make short interconnects using WBT tips.
Attachments
