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PostPosted: 04 Oct 2020, 00:31 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
It lives. Built mainly from bits on hand in a plastic jiffy box this Ozzy Miniwatt 6SN7 GTA (Ozzy vintage tubes) sounds good. Finish is copper hammer tone. I have a bag of turret brds. and this uses one. SRPP again, pot on the back. Here preamping Salt Cellar II 6EM7 wine box 2W power amp.
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Projects: | “La Ruse” - tube SRPP ECC83 preamp | "Noir” - Psvane tube preamp | ”fiih-300” - 300W Holton based amp | "Sortilege" - 180W Tripath Class D Mundorf upgrade amp |


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PostPosted: 04 Oct 2020, 20:51 
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If you want some more info go to my blog.

http://retro-thermionic.blogspot.com/20 ... astic.html

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Projects: | “La Ruse” - tube SRPP ECC83 preamp | "Noir” - Psvane tube preamp | ”fiih-300” - 300W Holton based amp | "Sortilege" - 180W Tripath Class D Mundorf upgrade amp |


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PostPosted: 06 Oct 2020, 21:52 
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Location: Arizona, USA
Hi Mark, seeing the hammertone paint reminds me of a trick....If you put it over a nearly dry first coat (need not be hammertone) it will give a "crackle" finish. A bit tricky to get right, but it has an interesting look.

Good listening
Bruce

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PostPosted: 06 Oct 2020, 22:31 
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gofar99 wrote:
Hi Mark, seeing the hammertone paint reminds me of a trick....If you put it over a nearly dry first coat (need not be hammertone) it will give a "crackle" finish. A bit tricky to get right, but it has an interesting look.

Good listening
Bruce

Thanks Bruce. I was glad to see on work on plastic. But the etching primer first makes all the difference.

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Projects: | “La Ruse” - tube SRPP ECC83 preamp | "Noir” - Psvane tube preamp | ”fiih-300” - 300W Holton based amp | "Sortilege" - 180W Tripath Class D Mundorf upgrade amp |


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PostPosted: 09 Oct 2020, 23:38 
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More images.
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Projects: | “La Ruse” - tube SRPP ECC83 preamp | "Noir” - Psvane tube preamp | ”fiih-300” - 300W Holton based amp | "Sortilege" - 180W Tripath Class D Mundorf upgrade amp |


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PostPosted: 17 Oct 2020, 20:42 
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I need some help here to bring down the gain of this preamp. It is way too high and I can barely turn the 100K pot up and for good listening levels. I’m not using the better part of the pot with a result there is an imbalance in the left and right channels. If I bring down the output level from the DAC then I can turn the pot up and the balance comes back.

I have built the cct. as in the schematic here and have added 220K resistors between the output caps and the input to the pot. I hoped this would drop the output level. It has but only marginally. I’m looking for an easy way to heavily reduce the output volume. Any suggestions?
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Projects: | “La Ruse” - tube SRPP ECC83 preamp | "Noir” - Psvane tube preamp | ”fiih-300” - 300W Holton based amp | "Sortilege" - 180W Tripath Class D Mundorf upgrade amp |


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PostPosted: 23 Feb 2021, 17:53 
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This is a rough mock-up of another “Illusion” type tube preamp build. Again in a plastic jiffy box but this time with some premium Genelex Gold Lion ECC83(s). Date stamp on the the tubes is “1104”. Yes I’ve had them for a while time to put them to use. Ive found other Gold Lion small tubes phenomenal sounding and hoping the same from this variant. Bruce once more helped me out with some tweaks to get his Forewatt to get the best out of these tubes. Thanks again Bruce.
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Projects: | “La Ruse” - tube SRPP ECC83 preamp | "Noir” - Psvane tube preamp | ”fiih-300” - 300W Holton based amp | "Sortilege" - 180W Tripath Class D Mundorf upgrade amp |


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PostPosted: 24 Feb 2021, 14:33 
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Hi Mark, my pleasure. NOS GL tubes can be really nice.

I prefer metal chassis for EMI and Safety reasons. But for a low gain device like this most anything will do.

Good listening
Bruce

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PostPosted: 27 Feb 2021, 06:25 
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viewtopic.php?

It lives. This time with ECC83 tubes. Another illusion type preamp. But in a plastic jiffy box. Worked at first on. Big bold sound from the Gold Lion ECC83s. Apart from some small holes on the top left of the enclosure to allow some cooling from a filament limiting R “La Ruse” is complete.

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Projects: | “La Ruse” - tube SRPP ECC83 preamp | "Noir” - Psvane tube preamp | ”fiih-300” - 300W Holton based amp | "Sortilege" - 180W Tripath Class D Mundorf upgrade amp |


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PostPosted: 28 Feb 2021, 20:31 
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“La Ruse” all finished with new Radi0kit PS. Regulated 12V 260HT. Added some bituminised heavy Al in the base for resonance control. Lots of gain and sound too good for such small tubes.
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Projects: | “La Ruse” - tube SRPP ECC83 preamp | "Noir” - Psvane tube preamp | ”fiih-300” - 300W Holton based amp | "Sortilege" - 180W Tripath Class D Mundorf upgrade amp |


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