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It is currently 12 Aug 2020, 21:54

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PostPosted: 10 Apr 2020, 20:14 
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Joined: 06 Jun 2008, 18:23
Posts: 5267
Location: Australia
Trackhappy wrote:
My Covid-19 fun. Another scrap bin job but works ok.
Attachment:
preamp.jpg

Attachment:
4S Preamp inside small.jpg


Transformer only give me 210 V B+. Sometime I'll find a better one. Caps on their way to replace the bundled ones. Pot is 100K, trying to source a 250K. Seems to be happy enough though. NOS Miniwatt 12BH7.
Enjoy.

Spud build. My new UX-171A preamp was made from parts I had on hand. Gratifying when you can do it with good results.

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Projects:“Salt Cellar” - Mono 807 triode integrated amp |
"Rosso" - E88CC SRPP preamp | ”Salt Cellar II” - 6EM7 mono wine box triode amp | “MWH” - 1920s UX-171A preamp |


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PostPosted: 12 Apr 2020, 14:49 
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Joined: 10 Apr 2020, 23:53
Posts: 7
Location: Uruguay
Hi all!

This is my 4S with solid state power supply. Sounds great! I'm fascinated!
Attachment:
4s6.jpg

Attachment:
4S3.jpg

Attachment:
4S1.jpg

In my country, the supply voltage is 220V, so I used a 240/240 power transformer for this project.

Volume control (Alps 100k) is at the input now (only the pot between the input connectors and the grids).

I use my SS amp Parasound Zamp v.3 (33 kΩ input impedance) and works great with the 4S.

Attachment:
4S7.jpg

Thanks Matt for the design and inspiration. ¡Gracias!

Greetings,

Sebastián


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PostPosted: 12 Apr 2020, 19:45 
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Joined: 06 Jun 2008, 18:23
Posts: 5267
Location: Australia
Your build looks very good.

_________________
Projects:“Salt Cellar” - Mono 807 triode integrated amp |
"Rosso" - E88CC SRPP preamp | ”Salt Cellar II” - 6EM7 mono wine box triode amp | “MWH” - 1920s UX-171A preamp |


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PostPosted: 12 Apr 2020, 20:18 
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Joined: 10 Apr 2020, 23:53
Posts: 7
Location: Uruguay
mwhouston wrote:
Your build looks very good.

Thank you very much, Mark! Thanks for this great project.


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PostPosted: 12 Apr 2020, 21:14 
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Joined: 03 Feb 2018, 00:47
Posts: 60
Location: Brisbane, Australia
Very nice build. :D


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PostPosted: 13 Apr 2020, 00:51 
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Joined: 13 May 2016, 02:02
Posts: 152
Location: Javea, Spain
Looks very nice. Enhorabuena!


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PostPosted: 15 Apr 2020, 19:55 
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Joined: 02 Oct 2014, 20:36
Posts: 47
hello folks,someboby tried the 4s with a 6n1p? i have tried and the sound is veeery nice!!!
stay safe you all,regards.


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PostPosted: 26 Apr 2020, 22:22 
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Joined: 10 Apr 2020, 23:53
Posts: 7
Location: Uruguay
Hi all,

I opted for the solid state power source because I didn't get a choke for the tube version. However, I would like to use a tube rectifier in the project.

My question is this: can I use a CRC filter instead of the choke?

What values ​​would the resistors be?

I think this while looking at the original power supply schematic.

Sorry for my English and thanks for your responses.


Sebastián


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PostPosted: 27 Apr 2020, 07:50 
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Joined: 23 Feb 2017, 02:02
Posts: 669
Yes you can use CRC instead, the resistor value sets the voltage drop in system and power disipation accross the resistor.


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PostPosted: 27 Apr 2020, 11:56 
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Joined: 10 Apr 2020, 23:53
Posts: 7
Location: Uruguay
Thanks for your answer.

I will replace the choke with a 150R / 5W resistor.

I know this solution is not ideal (and it is inefficient) but I would like to try it. Unless for some other reason you do not recommend it.

Thanks again,

Sebastián


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