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Parts [message #10272]

Thu, 06 January 2005 09:03

Manualblock
Messages: 4973
Registered: May 2009

Illuminati (13th Degree)

Got the transistors for my DOZ pre -amp and they shorted me two. This will get built someday. I also connected the toroidal trans backwards and fried it. Another part to buy. Nothing easy is worth having.

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Re: Parts [message #10273 is a reply to message #10272]

Fri, 07 January 2005 01:51

Wayne Parham
Messages: 18784
Registered: January 2001

Illuminati (33rd Degree)

Whatcha building, John? Tell me more about this preamp.

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Re: Parts [message #10274 is a reply to message #10273]

Fri, 07 January 2005 11:31

Manualblock
Messages: 4973
Registered: May 2009

Illuminati (13th Degree)

The pre-amp is a circuit found on Rod Elliott's site. It is a fully discrete minimal parts gain module designed to drive his DOZ power amp. It runs off a nicely regulated power supply utilizing an AC power pack. Shows good specs but I cannot speak to the sound quality as yet since the unit isn't up yet. The boards are stuffed and that was not easy since I tried to use high quality parts and as such needed to drill out some of the traces on the board. But it looks nice and if I don't screw up the transformer again it might be running next week. I built it to drive the Gainclones. It has 3 outputs. Oh yeah; I changed it from AC power pack to transformer thinking that might sound better.
I am noticing the Pi4's really like the GC's so this will be my system for awhile during the Groupbuild effort.

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Re: Parts [message #10275 is a reply to message #10274]

Fri, 07 January 2005 11:46

GarMan
Messages: 960
Registered: May 2009

Illuminati (2nd Degree)

Any interest in a Grounded Grid instead?

http://audioroundtable.com/Tubes/messages/678.html

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Re: Parts [message #10276 is a reply to message #10275]

Fri, 07 January 2005 13:16

Manualblock
Messages: 4973
Registered: May 2009

Illuminati (13th Degree)

Hi Garman; Very nice job on the breadboard. Let me ask you, what was the deciding factor that convinced you to try this particular circuit? Had you heard one, or; of one?
What is the output impedance? Thanks, again very nice job.

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Re: Parts [message #10277 is a reply to message #10274]

Sat, 08 January 2005 03:37

Wayne Parham
Messages: 18784
Registered: January 2001

Illuminati (33rd Degree)

Gotcha. Elliot always struck me as hitting on all eight cylinders so I expect it will satisfy when you get it running.

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Re: Parts [message #10278 is a reply to message #10275]

Sat, 08 January 2005 03:50

Wayne Parham
Messages: 18784
Registered: January 2001

Illuminati (33rd Degree)

I'm interested.

Tnuctipun has already posted a design that might be worth doing but I'd like to see your preamp design posted too. That way people have both options. For that matter, the Elliot preamp might be a good solid state option too. John, please let us know what you think of the Elliot preamp when you're done and it's running.

Different tastes for different palettes.

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Re: Parts [message #10279 is a reply to message #10272]

Sat, 08 January 2005 03:54

Wayne Parham
Messages: 18784
Registered: January 2001

Illuminati (33rd Degree)

Looking back through past posts, now I get it. DOZ is "Death of Zen."

Rod Elliotts pre-amp

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Re: Parts [message #10280 is a reply to message #10278]

Sat, 08 January 2005 09:35

Manualblock
Messages: 4973
Registered: May 2009

Illuminati (13th Degree)

I know; for a tube guy the SS thing is heresy. I wanted to see if a simple and well designed SS pre-amp will in fact, do justice to the GC's. As well as learning something of SS construction practice.
Elliott does seem to make a lot sense and his articles are informative and well written.

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Re: Parts [message #10281 is a reply to message #10280]

Sun, 09 January 2005 03:04

Wayne Parham
Messages: 18784
Registered: January 2001

Illuminati (33rd Degree)

Aaah, but we are in the Semiconductor forum.

I've heard some very nice solid state systems. Like you say, the SET and tube resurgence is fairly new. If your Elliot preamp sounds good, it might be a welcome project for those building solid state hifi systems.

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