His Master's Noise: A Thoroughly Modern Tube Phono Preamp - Page 23

21st April 2010, 12:00 PM
SY On Hiatus Join Date: Oct 2002 Location: Chicagoland	His Master's Noise: A Thoroughly Modern Tube Phono Preamp After more than 25 years of faithful service, it seemed that it might be time to redo my phono system. After all, I like to think that I've picked up a few tricks in the intervening years... The old system consisted of a VPI HW17-II, a Linn Ittok LVII tonearm, and a Troika cartridge. The Troika was... Click here to read the entire article Last edited by Variac; 2nd April 2011 at 12:17 AM.

13th November 2015

poli

diyAudio Member

Stuart, one question about the input pentode D3a:
Even though I am from Germany, it seems these are not that easy to these days, although the were know as "Poströhre" used by the German post. What about replacing it with a Siemens EF280F? Do you have any experience with this one?
Thank you!
Best
poli

13th November 2015

On Hiatus

No, I haven't used any other tube in the front end. At the time I wrote the article, D3a were pretty easy to get and relatively inexpensive. Do you have a datasheet for the EF280?

"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."

14th November 2015

jackinnj

diyAudio Member

I have ONE prototype board left -- found it when I was moving to our new house. PM if interested.

Why, silly hare, are you fleeing from the fierce jaws of the lion now grown tame?

16th November 2015

poli

diyAudio Member

Hi Stuart,
thank you. Yes, I found a Siemens E280F data sheet, but it is in German. I don't know how to upload the pdf. Do you have an email to send it to you?
Thank you.
Best regards
poli

16th November 2015

poli

diyAudio Member

Hi Stuart,
the data sheet pdf for the E280F ist located here:
https://frank.pocnet.net/sheets/190/e/E280F.pdf
Maybe you find the time to have a look. I the values are not clear, I can translate it into English.
Thanks a lot!
Best regards
poli

16th November 2015

On Hiatus

Kein Problem, ich kann Deutsch lesen.

The mu is somewhat lower than D3a, but otherwise, it looks like an excellent candidate.

"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."

16th November 2015

poli

diyAudio Member

Hi Stuart,
thank you! I didn't know that :-)
Ok, will take that into account and will look for both D3a and E280F.
Cheers
Michael

8th December 2015

luvdunhill

diyAudio Member

SY:

Could you clarify some finer points for me. Reference my scribbles below:

For Sale: Yet-Another-FirstWatt-PSU | "CSX1/2" "Buffered F6" FE

8th December 2015

luvdunhill

diyAudio Member

A.) I'd like to use an XLR cable for the input and also support RCA. My phono cable also has a shield. What do you think of this configuration, leaving pin 1 open?

B.) where do the CT and the can connections go on the Sowter 8055?

C.) What do you think of the Zobel? I'm using the recommendations on the datasheet as well as your schematic. Is this flexible enough for some experimentation?

D.) On the output, what about (ab)using a XLR connector as shown? It will be going to an Impasse most of the time, so I was thinking about using both a RCA and XLR connector here as well, for symmetry. Is tying the two pins together as shown a reasonable practice?

E.) I've explicitly added earth connections to the XLR connectors, as they are available on the connectors I'm using. Am I connecting them properly?

Just a few finer points to clarify. Thanks!

8th December 2015

On Hiatus

I'm not clear on where that second circuit is connected? The output or the input?

"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."