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It is currently 11 May 2021, 15:12

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PostPosted: 22 Feb 2021, 12:08 

Joined: 08 Feb 2021, 20:38
Posts: 8
Hi Members,

I am a long-time musician. Studied music theory in college and continue to study theory and composition daily. Also studied tuning theory and the harmonic series, electronics, speaker cabinet construction, own a PA, reconed speakers and serviced many electronic issues over the years.

Decades ago I owned a Dynaco PAS3 preamp and "two" monoblock Dynaco ST-70 poweramps.

I educated myself on electronics via books and videos for years. Unfortunately, a lot of my DIY build books are math heavy and therefore difficult to understand the electronic theory of what circuit I'm building, why and how it functions.

I do own some test equipment, many tools, have chassis drilling/metal work experience, chassis painting, can build my own circuit eyelet boards, control panels and have soldered circuits.

My turntable is a Thorens TD 145 MkII. The phono cartridge is a moving-magnet, model is: Ortofon Super OM10. The Super OM10 cartridge specs for tube-preamp compatibility are:

-Stylus type: Bonded Elliptical
-Output voltage" > 4 mV @ at 1000 Hz, 5cm/sec.
-Compliance, dynamic (lateral): 25 µm/mN
-Internal impedance, DC resistance: 1 kOhm
-Recommended load resistance: 47 kOhm
-Recommended load capacitance: 200 - 500 pF

Questions please:

Can anyone recommend an "approachable" DIY stereo tube preamp and a low wattage (8 watts max) tube poweramp book that actual explains the signal path and not only the "how to" part but the "why" of the build?


Is anyone selling plans-only for a time-tested, proven design? Plans that include instructions, parts list, schematics and layout-drawings for a simplistic stereo tube-preamp and a low wattage tube poweramp (8 watts max)? I can source parts.

If plans are available, do they include email support and/or forum support? There are always questions.

Will the recommended book and/or plans focus on separate components? Ideally I'd like to build separates as I can better understand the workings of each component verses having everything in one chassis.

Thank you all for your time.

PostPosted: 22 Feb 2021, 16:32 

Joined: 13 Jan 2018, 21:33
Posts: 407
Location: australia
There is on this site a page dedicated to tube amp projects. See viewforum.php?f=9 In the diy forums area see viewforum.php?f=9 are the ongoing threads of people undertaking builds of the designers active here or external designs. As you can see some threads have been going for years so support is available. I am not aware of any documented plan sets since I have been following but the threads and posts illuminate most issues you’re likely to confront. Others long term members may assist with questions I haven’t been able to answer. I have seen recommendations on good texts that I haven’t followed up. Some may be mentioned in the technical references. Some respected folk here have mentioned Richard Keuhnel as a good author of valve amp focussed books. See ... d-kuehnel/. Regards and welcome!


PostPosted: 22 Feb 2021, 20:13 

Joined: 08 Feb 2021, 20:38
Posts: 8
Thank you kindly Woodo. Yes I did bounce around looking at the diy tube projects page and saw some interesting items for sure. Thank you. I did visit Richard Keuhnel's website. Lots of intetesting books on guitar amps. I will certainly research those. I've been building a complex tube guitar amp for quite a few years. Seems like Richard is geared towards instrument amps and not stereo tube hifi amps which I am searching for. However he is a great source when i need info going down the path of instrument amps. Will keep digging through the threads. There's hundreds of them. Thanks again woodo.

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