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PostPosted: 12 Aug 2018, 05:59 
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Joined: 23 Jul 2018, 12:44
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Location: London, UK
I am interested in building a valve hi fi for my living room and would like some suggestions for the project.

I have built a couple valve guitar amps and a lot of DIY synth projects so I have some experience. Ideally I'd love to start with a circuit from a classic hi fi stereo but I'm having trouble finding one that suits.

I don't have much space so I'd love to avoid having a separate preamp and power amp. I would like to be able select between a few different inputs: an optical to RCA coming off my TV, and a phono preamp, and maybe a CD player. And of course it would be good to have a volume and perhaps tone control. Are there any classic integrated preamp and power amp designs? It seems like I could just use a classic power amp design and modify it to add an input selector and a volume attenuator - or am I missing something?

Thanks,
Tom


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PostPosted: 13 Aug 2018, 12:28 
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Joined: 02 Mar 2009, 12:41
Posts: 1057
Location: Vänersborg, Sweden
If you just have line level inputs, almost any power amplifier can be turned into an integrated amp. Just add a selctor switch and a potentiometer (or two) and you are there.
All my amps (Darling, Stealth5, 5998A-SE and a bunch more that is on their way) are nothing but power amps with necessary add-ons for adjusting volume and in some cases selector switches (and even iPod docking stations).

(However, I have a few preamps, including a PAS3X in the production line ... just for ... fun :confused: ).

I wwould really love to hear more about your synth modules as I am a big fan of MFOS and am struggling with an Anushri.

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PostPosted: 15 Aug 2018, 08:16 
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Joined: 23 Jul 2018, 12:44
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Location: London, UK
Hi Soundbrigade. Thanks for the pointers. Would the potentiometer be inserted between input and first stage?

MFOS's Noise Toaster was my first synth-diy project as a matter of fact. I haven't built an Anushri but I did build a Shruthi and an Ambika. They are both fun synths. I have two homemade cases of eurorack modules that I've built, and a TTSH.


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PostPosted: 15 Aug 2018, 09:15 
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Joined: 02 Mar 2009, 12:41
Posts: 1057
Location: Vänersborg, Sweden
Directly at the input. It's good to have a bleeder to GND and a smaller to grid. Look at the two lowest schematic: http://www.pastisch.se/tubes/5998A_SE.htm


PS. Got the PCBs for the 2nd Noisetoaster and the Echo Rockit today.

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PostPosted: 17 Aug 2018, 07:00 
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Joined: 07 Jan 2018, 07:13
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Hi,

Bruce’s PoddWatt would work fine.

It can be found in the schematics section and there is a thread


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PostPosted: 29 Aug 2018, 14:29 
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Joined: 23 Jul 2018, 12:44
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Location: London, UK
That Poddwatt sounds good. Thanks!


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PostPosted: 29 Aug 2018, 15:53 
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Joined: 04 Jun 2008, 20:59
Posts: 3787
Location: Arizona, USA
Hi, I don't promote my own projects as I figure they should do that on their own. However either the early version of the Poddwatt with a single power supply or the later one with the dual supply are rather nice amplifiers. If you prefer mono blocks then the mini-blocks are each 1/2 of a the dual Poddwatt. I use them in my present system. 8-) In any case using the latest schematics for them is beneficial. The attached schematics are the ones to use.

EDIT: (gads...I can't believe that the design has lasted 5 years without any need for updating) PS the power supply shown is for the Dual version (two are needed for it) and Mono Block version. If you want a single supply for a stereo amp then the one in the early posted project is the one to use.

Good listening
Bruce
Attachment:
Poddwatt DMB Main Circuit August 25, 2013.jpg
Attachment:
Poddwatt DMB PS August 25 2013B.jpg


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