custom 10W Jube

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V2
Posts: 124
Joined: Sun May 12, 2013 1:45 am
Location: Vancouver Canada

custom 10W Jube

Post by V2 »

Hey guys,

I just finished building this one-channel amp whose preamp is based on a Marshall 2550 (no clean setting, however). Power amp is pretty simple: 10-ish Watts, single-ended, cathode-biased, any octal tube, no NFB.

https://soundcloud.com/v2-jmcd/v2-lotto ... e-and-evil
https://soundcloud.com/v2-jmcd/lotto-amp-2-jube-hth


[img:800:533]http://i1216.photobucket.com/albums/dd3 ... gawkp2.jpg[/img]

[img:1024:682]http://i1216.photobucket.com/albums/dd3 ... 0mj0jc.jpg[/img]
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xtian
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Re: custom 10W Jube

Post by xtian »

"Jubenile"! I love it.

Without gut shots, it didn't happen.

How's the hum at idle? That's the only thing that keeps me from enjoying SE amps at home.
I build and repair tube amps. http://amps.monkeymatic.com
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V2
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Re: custom 10W Jube

Post by V2 »

xtian wrote:"Jubenile"! I love it.

Without gut shots, it didn't happen.

How's the hum at idle? That's the only thing that keeps me from enjoying SE amps at home.
Randy Fay makes the Phaez Jubenile, so he probably came up with that great name. For some reason he doesn't mind me making my custom versions of his amps every once in a while.

There's none of the typical SE hum in this amp because I put an additional stage of filtering before Va.
stretch2011
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Re: custom 10W Jube

Post by stretch2011 »

Choke or no choke?
It looks great!
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V2
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Re: custom 10W Jube

Post by V2 »

No choke in this one. (I do have a choke in my own 10W design, however.)
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roberto
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Re: custom 10W Jube

Post by roberto »

Why so many people is cloning diode clipping stuff?

In fact on the forum where I'm moderator, sloclone, we have a dedicated section: diode clipping dystopia...
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V2
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Re: custom 10W Jube

Post by V2 »

I kinda think that section of sloclone is silly. lots of amps without diode clipping get stuck in that section (e.g., Friedman PT20); and I bet the Jube would bet put in the 'other noteworthy amps' section because its not made by Friedman or Fortin.
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rp
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Re: custom 10W Jube

Post by rp »

roberto wrote:Why so many people is cloning diode clipping stuff?
You would think the last amp to need diode clipping would be a small SE with no NFB. All the ingredients are present for making an abundant ruckus.
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V2
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Re: custom 10W Jube

Post by V2 »

rp wrote:
roberto wrote:Why so many people is cloning diode clipping stuff?
You would think the last amp to need diode clipping would be a small SE with no NFB. All the ingredients are present for making an abundant ruckus.
Very true. The whole dual-clipper circuit between stages 2 and 3 can be replaced by a simple voltage divider, with or without treble peaked. That's how I originally tested this amp actually - and it sounded excellent...
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