madBrahmin guitar amp
This is another project of mine, I built it around 2011/12 and it has two channels with various mods (bright, additional gain stages etc.), effects loop, master volume, presence and I don't remember what else, plus potentiometers and sockets for easy biasing of output tubes. Don't have the pics of the box though. It's coated with a fluffy fabric that resembles Polish black-and-white cows and the name is a pun: "ma-dB-rahmin" and "mad brahmin", inspired by the two-headed cows from Fallout series.
This is another project of mine, I built it around 2011/12 and it has two channels with various mods (bright, additional gain stages etc.), effects loop, master volume, presence and I don't remember what else, plus potentiometers and sockets for easy biasing of output tubes. Don't have the pics of the box though. It's coated with a fluffy fabric that resembles Polish black-and-white cows and the name is a pun: "ma-dB-rahmin" and "mad brahmin", inspired by the two-headed cows from Fallout series.
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Yep, soft start. I got the filament current capacity and it also serves as a RC filter stage.
Definitely no blue glow from the 6V6 tubes, though I've red-plated many of them in my guitar amps.
Thanks for all the kind words, everyone!
'¨
I am using the 5998A
in a simple SE-amp, and stocked up some extras to eventually build a 4998A-PSE. Nice tube that is slightly easier to use that 6AS7G due to higher gain.
Nice build.
They are wired as parallel cathode followers with an active load! With 5998, output impedance is around 28ohms.
01a build
Hi all,
This is an 01a preamp build I've just finished. It's the Bartola valves recipe and I'm very happy with the sound. The only bit I might visit again at some point is maybe to add the source follower from Bartola. The chassis is a repurposed industrial case, nothing special there except that it's steel, and was big enough to get the transformers and choke well away from the audio lines. Shielded cable throughout and attention to grounding helped get it silent.
All credit goes to Ale Moglia and Rod Coleman for the filament supplies and gyrator and design and to the crew here who enable this habit!
Fran
Hi all,
This is an 01a preamp build I've just finished. It's the Bartola valves recipe and I'm very happy with the sound. The only bit I might visit again at some point is maybe to add the source follower from Bartola. The chassis is a repurposed industrial case, nothing special there except that it's steel, and was big enough to get the transformers and choke well away from the audio lines. Shielded cable throughout and attention to grounding helped get it silent.
All credit goes to Ale Moglia and Rod Coleman for the filament supplies and gyrator and design and to the crew here who enable this habit!
Fran
Attachments
Yep, soft start. I got the filament current capacity and it also serves as a RC filter stage.
Definitely no blue glow from the 6V6 tubes, though I've red-plated many of them in my guitar amps.
Thanks for all the kind words, everyone!
Must agree the 6CG3 produces a very nice ramp up voltage on turn on . I am using a pair on a pre amp i am working on .
That's a purty pig there, drteming.
I've got a preamp design I'm thinking of revisiting with vintage VR tubes that glow beautifully. It is shamelessly about the look in my case, and is not likely to be my every day linestage as I shudder at the power I consume with my amps. That said, I don't use 500wpc amps to drive 86dB speakers. I'm more of a 1-3wpc guy with 90+dB speakers.
I've got a preamp design I'm thinking of revisiting with vintage VR tubes that glow beautifully. It is shamelessly about the look in my case, and is not likely to be my every day linestage as I shudder at the power I consume with my amps. That said, I don't use 500wpc amps to drive 86dB speakers. I'm more of a 1-3wpc guy with 90+dB speakers.
I never noticed that, but once you pointed it out...I spent last evening going through my builds, peeling off all the transformer stickers and sticking them inside the bottom cover. Thanks for triggering a mini OCD episode.
DIY preamp, CCDA 6H8C linestage preceded by SS tone control. Custom brass knobs made by Peterson Engineering in the UK. They did a really good job, contact Olly on sales@petersenengineering.co.uk if you want some knobs made. Video here - DIY Valve Preamp. - YouTube
Andy.
Andy.
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Preamp RTP3 built in AliExpress Reisong models
Hi,
my fresh tube RTP3 line-preamp build, as posted at this tread:
https://www.diyaudio.com/forums/tubes-valves/151733-vacuum-rtp3c-79.html#post6769085
It has started at January 2021, I have bought 2 Reisong preamps, so I used its case for build phono-preamp and finally line-preamp.
The Reisong model use Marantz7 circuit, which works very well itself, going to 200-250kHz bandwith, nevertheess I tend to go to the edge - now is simply better.
Pics shows units before and after
Now I finally play vinyl - tube phono - tube line - tube amps 15W SE... nice!
Hi,
my fresh tube RTP3 line-preamp build, as posted at this tread:
https://www.diyaudio.com/forums/tubes-valves/151733-vacuum-rtp3c-79.html#post6769085
It has started at January 2021, I have bought 2 Reisong preamps, so I used its case for build phono-preamp and finally line-preamp.
The Reisong model use Marantz7 circuit, which works very well itself, going to 200-250kHz bandwith, nevertheess I tend to go to the edge - now is simply better.
Pics shows units before and after
Now I finally play vinyl - tube phono - tube line - tube amps 15W SE... nice!
Attachments
