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  #11  
Old 05-27-2016, 11:54 PM
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jbaudio68 jbaudio68 is online now
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John, you built THAT? You are a GOD! Wow. I'm consistently impressed by the horsepower of this group (and clearly the weakest link). Nicely done.


Nicely done.
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  #12  
Old 05-28-2016, 06:46 AM
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deafbykhorns deafbykhorns is offline
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Thanks!
You want to see something impressive, Google "833 Midlife Crisis" and click on images.
That amp was my inspiration to build this and truly impressive, it's a 195wpc triode with only two tubes. Operating a tube at 2300volts is an engineering feat.
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Main System- McIntosh MX119/MVP871/MC352/MC7106, Scratch built 2A3 , Technics SP15/Graham/XV1s,Klipschorns w/ALK xovers/Trachorns, Speakercraft MT8(4), Velodyne DD-18, Sonos ZP90,Boxee Box
Office System- Adcom GTP500/GPA545/,AA/twisted pear DAC, Kuzma, Northcreek Borealis
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  #13  
Old 07-19-2018, 07:50 PM
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Default Built Matching Preamp this year

I finally completed my preamp to match the GM70 monoblocks after taking a break from audio for a year.
Thia scratch built 01A is a beautiful sounding preamp but very difficult to keep quiet. Circuit consists of a very simple design but with some modern power supply tricks. Instead of a choke, I used an electronic choke called a gyrator and heated the DHT filaments with Rod Colemans filament supplies very popular in the DIY market and probably licensed to some commercial manufacturers. Power supply is dead quiet using tube rectifier and Maida regulars.
I purchased several tubes(globes) just to find a couple that were not microphonic. The ST tubes however are very quiet along with the 112a tube. My next mod is to remove the resistive pot at the input and install Dave Slagles AVC at the output of the preamp. This should definately bring this preamp to new levels. At unity gain, it will also give me about 600ohms out which is great news for driving longer cables. Also, at 140Henry, the bass is still very good according to my LTSpice model. As of now, this preamp smokes my Audio Research SP6, cant wait to hear it with the AVC!




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Main System- McIntosh MX119/MVP871/MC352/MC7106, Scratch built 2A3 , Technics SP15/Graham/XV1s,Klipschorns w/ALK xovers/Trachorns, Speakercraft MT8(4), Velodyne DD-18, Sonos ZP90,Boxee Box
Office System- Adcom GTP500/GPA545/,AA/twisted pear DAC, Kuzma, Northcreek Borealis

Last edited by deafbykhorns; 07-20-2018 at 08:22 AM.
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  #14  
Old 07-19-2018, 08:12 PM
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John.......Great to see you post again. I thought you had fallen off the end of the Earth.

The new preamplifier looks superb. It may be time to begin building these amps and preamps for sale.
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  #15  
Old 07-20-2018, 08:51 AM
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Just busy with work, up to about 125 people on the payroll now.....
At this rate, retirement may come sooner than later.

Took me a year to finish this pre-amp due to all the other hobbies, work, etc.
Got a much bigger boat so doing some serious fishing and diving. Also going to the mountains a lot to mountain bike.

I can tell you that manufacturers earn every penny. The amount of time that goes into R&D is insane. Another reason why many outsource to china but if you want a badass handmade amp/preamp, this is the way to go. I have owned many pieces of equipment over the years as you know and I may be a little biased but this setup smokes everything prior to this DIY system. I attribute most of it to the hand picked parts used and the custom OPT transformers using exotic materials.
Will have more time when retirement comes
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Main System- McIntosh MX119/MVP871/MC352/MC7106, Scratch built 2A3 , Technics SP15/Graham/XV1s,Klipschorns w/ALK xovers/Trachorns, Speakercraft MT8(4), Velodyne DD-18, Sonos ZP90,Boxee Box
Office System- Adcom GTP500/GPA545/,AA/twisted pear DAC, Kuzma, Northcreek Borealis
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  #16  
Old 07-20-2018, 09:03 AM
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Default Boat anchor

Really nice to see some great diy work on the forum. Congrats on a fantastic build.
Tom
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Last edited by W9TR; 07-20-2018 at 10:13 AM.
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  #17  
Old 07-25-2018, 08:36 PM
Formerly YB-2 Formerly YB-2 is online now
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Quote:
Originally Posted by deafbykhorns View Post
I spent good $$ on the best output transformers money could buy.
What would those be?

Very nice work.
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Last edited by Formerly YB-2; 12-02-2018 at 09:26 AM.
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  #18  
Old 12-01-2018, 10:50 PM
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Hi John. Yes, very nicely done! I agree, a well-designed and executed DIY component will beat most commercial offerings and cost less. Plus all the satisfaction you get from it. As soon as I'm allowed, I can post pics of my latest creations.
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  #19  
Old 02-04-2019, 10:17 AM
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Quote:
Originally Posted by Formerly YB-2 View Post
What would those be?

Very nice work.
A mix of Monolith Magnetics and Dave Slagle (Intact Audio)
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Main System- McIntosh MX119/MVP871/MC352/MC7106, Scratch built 2A3 , Technics SP15/Graham/XV1s,Klipschorns w/ALK xovers/Trachorns, Speakercraft MT8(4), Velodyne DD-18, Sonos ZP90,Boxee Box
Office System- Adcom GTP500/GPA545/,AA/twisted pear DAC, Kuzma, Northcreek Borealis
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