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Tube Voltage Regulator, Is it worth the effort

Posted 27th October 2009 at 11:31 PM by DougL
Updated 13th January 2010 at 09:53 PM by DougL

This thread has some good, solid information and very little bravado.

http://www.diyaudio.com/forums/tubes...th-effort.html

Special Mention to:
janneman
Tubelab
kevinkr
Allen Wright
Bas Horneman
SY

For their interesting contributions.

IMHO, There are several ways to make an adequate Power supply. And several ways to totally botch the job.

In the 1980's, I was totally against using solid state in a tube preamp. However, this was more about not using low voltage devices in high voltage circuits than anything else.
Now that high voltage transistors are available this is not a major consideration.
My first tube amp is going to be a platform to play with some of the discussions.
I want to try unregulated and regulated power supplies. I will probably start out with unregulated choke input supplies.

It...
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Old

Beast with a Thousand JFETs

Posted 28th September 2009 at 07:17 PM by DougL

Quote:
Originally Posted by Nelson Pass View Post
Jam called me up and asked if I have ever paralleled up a
bunch of 2SK170's and 2SJ74's to make a power output
stage.

I guess it's time to unveil the Beast with a Thousand JFETs.

Here's the first teaser, a circuit panel to hold 588 JFETs and
associated resistors.
What can I say. Its a pleasure to see a master at work.
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Old

Tube Cad Jurnal Interesting Items

Posted 9th September 2009 at 04:59 PM by DougL

In John's TCJ Blog He featured the Logitech power supplies For Duet and Squeezebox.

Since I have an SB3 and have been thinking of upgrading the power supply, this is a great source of inspiration to me.

http://www.tubecad.com/2009/09/blog0170.htm
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Old

Zero Feedback Impedance Amplifiers

Posted 2nd September 2009 at 05:15 PM by DougL
Updated 2nd September 2009 at 06:52 PM by DougL

This amplifier is also an example of original thinking. http://www.diyaudio.com/forums/solid-state/42259-zero-feedback-impedance-amplifiers.html

For anyone interested, here is the URL to the Amplifier.
http://www.audiophonics.com/audiophonics-zeus-about.html

I think this design just made my bucket list.
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Old

SS Tabor

Posted 1st September 2009 at 03:00 AM by DougL

Someone was discussing a SS version of a tube amp. Look for SS Tabor

http://www.pimmlabs.com/

Cool site.

There are a couple of SS transformer amps.

All of them look cool to me.
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Old

Project: RAKK DAC

Posted 31st August 2009 at 07:20 AM by DougL

I have had my RAKK DAC going for a while now. Great DAC. I bought a case and the RAKK DAC passive board to replace the EDCOR transformers I was using and I am using the Shunt volume control to select the shunt resistor.

Goal is to get it done this week.
I will post pictures after its complete.
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Old

Why is there air?

Posted 31st August 2009 at 03:44 AM by DougL
Updated 31st August 2009 at 06:51 AM by DougL

A series of posts by someone who's nom de plume is an obnoxious comedian. Wonderful.

http://www.diyaudio.com/forums/tubes-valves/150302-what-causes-high-thd-tube-amps.html
http://www.diyaudio.com/forums/tubes-valves/150292-cons-pros.html
http://www.diyaudio.com/forums/solid-state/150252-who-makes-amps-theoretically-should-sound-best.html
http://www.diyaudio.com/forums/solid-state/150024-class-inherent-disadvantages.html
http://www.diyaudio.com/forums/solid-state/150304-op-amps.html

Harmless. However, it takes up a lot of the board's energy for a time.
This too shall pass.

I haven't found "Texas" yet. The Mods used to post hilarious commentary along with the outrageous posts. As the board has matured, not so much. It was a deep fried Twinkies kind of guilty pleasure.
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Old

Transformers

Posted 31st August 2009 at 01:35 AM by DougL
Updated 31st August 2009 at 06:51 AM by DougL

http://www.diyaudio.com/forums/showt...52#post1910252
Bud is very enlightening.
Its a joy to have him comment positively about several companies.
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Old

Tubelab PP

Posted 28th August 2009 at 02:35 AM by DougL
Updated 31st August 2009 at 06:52 AM by DougL

Here is an example of engineering I admire.

http://www.diyaudio.com/forums/tubelab/148694-tubelab-simple-p-p.html
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Old

Blog for Doug Lockwood

Posted 28th August 2009 at 02:04 AM by DougL
Updated 31st August 2009 at 06:53 AM by DougL

I am going to use my blog to document threads that I am interested in.

This caught my interest.

http://www.diyaudio.com/forums/analog-line-level/80194-lightspeed-attenuator-new-passive-preamp.html

Looking at a B1 buffered Lightspeed.
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