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His Master's Noise: A Thoroughly Modern Tube Phono Preamp
His Master's Noise: A Thoroughly Modern Tube Phono Preamp
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Old 14th December 2017, 03:34 PM   #471
lehmanhill is offline lehmanhill  United States
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Quote:
Originally Posted by jackinnj View Post
It depends on which clerk at the post office
So true.
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Old 14th December 2017, 06:09 PM   #472
jackinnj is offline jackinnj  United States
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His Master's Noise: A Thoroughly Modern Tube Phono Preamp
Quote:
Originally Posted by luis.martins View Post
Hi Jack,

Great to hear from you!

Are the boards just for the audio circuit?
Do you have a photo of the boards?
And maybe assembled board?
How did the tests turn out?

Cheers,
Luis
See this post, and those surrounding: His Master's Noise: A Thoroughly Modern Tube Phono Preamp
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Old 17th December 2017, 11:45 AM   #473
frankwilker is offline frankwilker  Germany
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Hi,

i use a R-Core-Transformer.
Never a problem with hum. A good solution against hum is also to use the PS for tube heating which was provided from Allen Wright.
One adjustable LM317 for each tube. I works like a CSS against hum. If you are interested, mail me.
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Old 17th December 2017, 12:11 PM   #474
frankwilker is offline frankwilker  Germany
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Hi Luis,
to trim the RiAA you have to use the complete first stage, cause the Resistor (i think Ri) is part of the RIAA network. Read Sy´s explanation carefully. Its very helpful.
Myself i used measured and matched 10nf Mica East-Europe. My RIAA-network matched with 3 x 10nf Mica, 3,3 nf Wima FKP2 and 680 pf and 20,7K as R7.
If you are interested at the Mica, mail me, please.
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Old 17th December 2017, 12:15 PM   #475
frankwilker is offline frankwilker  Germany
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HMN small.jpg

HMN back small.jpg
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Old 17th December 2017, 12:20 PM   #476
frankwilker is offline frankwilker  Germany
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HMN bestückt.jpg
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Old 17th December 2017, 02:19 PM   #477
lehmanhill is offline lehmanhill  United States
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Originally Posted by frankwilker View Post
Myself i used measured and matched 10nf Mica East-Europe. My RIAA-network matched with 3 x 10nf Mica, 3,3 nf Wima FKP2 and 680 pf and 20,7K as R7.
Mica caps are great, I find them very neutral. Did you do your own board? It looks like the board was made with the 3 parallel Mica + FKP2 designed into the board.

I love that you have space for the big axial caps too.

Jac
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Old 20th December 2017, 10:24 AM   #478
frankwilker is offline frankwilker  Germany
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Hi Jac,
the Micas are great. I made this board first for mounting in my Hovland HP100. As I developed the board, i made sure that there is place for different capacitors and for the Micas I owned. The best is, the most russian or east-european Micas have a tolerance from 0,5 to max 1 percent. Now is the hovland sold and i have to build a case for the noise-machine.
I build a second board (this is sold) so i bought 100pcs 10nf Micas (matched). Fortunately they match the place on the board.
If somebody is interested in Micas, please ask.
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Old 3rd January 2018, 05:58 PM   #479
luis.martins is offline luis.martins  Portugal
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Originally Posted by mrdave45 View Post
I would be tempted to use your dual caps so both sides work on 160v L + R and the other on 260v L + R. I think you'll find the overall layout of the boards in the case a bit easier.
Hi Dave,

Thank you for your tips!
I'll have to work on the layout of my build, but I guess it will be close to yours.

I'm planning on one box only, so there will be no cables with HV plugs.

--
Luis
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Old 3rd January 2018, 06:05 PM   #480
luis.martins is offline luis.martins  Portugal
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Quote:
Originally Posted by jackinnj View Post
Boards are $3.00 shipping to Portugal probably $9 or $12. It depends on which clerk at the post office
Hi Jack,

Thank you for your reply. for now I think I'll work on a point to point construction of the signal circuit, with the CCS on small breadboard style PCBs. It will give a bit more freedom in the layout.

I'm very keen on tube amps where the tubes pop out of the box and you can see the tubes glowing. I understand it is a very romantic idea, but I guess that is why we spin vinyl on our turntables to start with.

--
Luis
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