Check out my new Phono stage

jn2630 · 22nd January 2008, 03:19 AM

Here is my newly built phono stage. It is my first tube project, and my first "from scratch" (including enclosure) project. It is complete except for one 12at7 tube thats on its way. I would like to thank everyone who has put up with my "noob" questions. If I never found this site, I might not have even attempted this project. I'm looking forward to playing some BOSTON!

Serge66 · 22nd January 2008, 07:31 AM

Hi,
Looks nice. What kind of wood are you using?
Do you have ventilation holes at the back?
Serge

SY · 22nd January 2008, 12:10 PM

Circuit?

(questions, questions, I always have questions!)

Sal Brisindi · 22nd January 2008, 12:16 PM

Can you post the schematic of your phono preamp?

Sal Brisindi

jn2630 · 22nd January 2008, 04:26 PM

The schematic can be found at this site: http://www.dogstar.dantimax.dk/tubestuf/sapindex.htm

As for ventelation holes, most of the back panel was left uncovered so it has plenty of ventelation.

Wavebourn · 22nd January 2008, 06:27 PM

Quote:

Originally posted by jn2630
The schematic can be found at this site: http://www.dogstar.dantimax.dk/tubestuf/sapindex.htm

As for ventelation holes, most of the back panel was left uncovered so it has plenty of ventelation.

Are you going to improve it?

It seems that 2K load by a feedback loop shunts out output with 27K plate load reducing a FB gain on highs dramatically so weight of high order harmonics is increased. Also, I would shunt noisy neon bulbs by a capacitor.

jn2630 · 22nd January 2008, 11:37 PM

I just built the circuit exactly like the schematic, except i eliminated the coupling capacitors on the 1n4007's on the power supply.

Also, the wood is just a stained maple veneer plywood.

jn2630 · 23rd January 2008, 12:26 AM

Here is a pic of the guts:

22nd January 2008, 07:31 AM	#2
Serge66 diyAudio Member Join Date: Nov 2007 Location: Canton of Jura	Hi, Looks nice. What kind of wood are you using? Do you have ventilation holes at the back? Serge __________________ 'I have no faith in prayer that's not electronically augmented' Philip K. Dick "A Maze Of Death" 'I have no faith in bimbos that are not surgically augmented' Serge66

22nd January 2008, 12:10 PM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Circuit? (questions, questions, I always have questions!) __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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22nd January 2008, 12:16 PM	#4
Sal Brisindi diyAudio Member Join Date: Nov 2006	Can you post the schematic of your phono preamp? Sal Brisindi

22nd January 2008, 04:26 PM	#5
jn2630 diyAudio Member Join Date: Dec 2007	The schematic can be found at this site: http://www.dogstar.dantimax.dk/tubestuf/sapindex.htm As for ventelation holes, most of the back panel was left uncovered so it has plenty of ventelation.

22nd January 2008, 11:37 PM	#7
jn2630 diyAudio Member Join Date: Dec 2007	I just built the circuit exactly like the schematic, except i eliminated the coupling capacitors on the 1n4007's on the power supply. Also, the wood is just a stained maple veneer plywood.

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