WE417A Valve Preamplifier

rclourenco · 5th January 2011, 06:36 PM

Dear Members,
Just like to share my latest construction.
It’s a preamplifier (line level), based on the small WE417A valve (one each channel), using output transformers. The final result is shown on the attached picture (hope you enjoy it).
List of inside goodies:
- One input resistor from Shinkoh.
- Volume Pot from TKD.
- Balance Pot from Alps on its Black Beauty version (my new old stock).
- Input control from front panel through C&K switches, to relay input board.
- Input relays from Nais (TDS).
- All aluminum chassis (based on Hifi2000 parts), 20mm sides, 10mm CNC machined front.
- Stainless steel shafts for front panel knobs connection to the pots.
- 4 special polymer bearings to guide the shafts (feel is incredible).
- 2 machined connectors from shafts to pots.
- Lundahl mains transformer.
- 1 double Lundahl choque.
- 2 more choques from Hashimoto.
- 3 double Elna Cerafine 100uF/500V power supply caps.
- All power cabling Nordost single strand copper.
- 5AR4 valve rectifier.
- 2 TDO 25W resistors to lower plate voltage from 200V to 180V.
- New old stock Western Electric Valves.
- 2 Tentlabs Heater supplies.
- Hashimoto output transformers.
- Direct connection from input to 1 resistor, next to volume and balance pot, into the valve grid, and direct to Output transformers. Nothing more, just a direct connection to output connectors through the 600 ohm transformer connection.
- All signal wiring is cryo treated pure silver from Audio Consulting.
- Neutrik RCA panel connectors.
- Furutech IEC connector.
It sounds simply astonishing with these impressive Hashimotos.
Best wishes for 2011.

Pano · 6th January 2011, 01:58 AM

moved to tubes/valves.

Gordy · 6th January 2011, 02:03 AM

You have clearly put much work into your preamp. The external presentation is very good indeed - better than many expensive commercial units. Well done, and I hope you enjoy the fruits of your work.

Wisp · 6th January 2011, 11:59 AM

rclourenco,

Very Nice !

SemperFi · 6th January 2011, 01:22 PM

gorgeous! Makes me feel like I've got ten thumbs...

Miniwatt · 6th January 2011, 01:45 PM

More pictures please!

Zen Mod · 6th January 2011, 01:52 PM

Fugly!

Stixx · 6th January 2011, 01:53 PM

shuweet!!

el156 · 6th January 2011, 02:00 PM

Muito Bonito ! Beautifull !
Parabens !
How about share the schematic with us? And more Pics ?
Silvino

Rodeodave · 6th January 2011, 02:12 PM

Beautiful! Galaxy Maggiorato with custom side panels? Did you do the milling yourself? Very very nice.

6th January 2011, 01:52 PM	#7
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	Fugly! __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

6th January 2011, 02:12 PM	#10
Rodeodave diyAudio Member Join Date: Dec 2004 Location: in the alps Blog Entries: 1	Beautiful! Galaxy Maggiorato with custom side panels? Did you do the milling yourself? Very very nice. __________________ Gravity - Making the G since 13.7 billion B.C.

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6th January 2011, 01:58 AM	#2
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	moved to tubes/valves.

6th January 2011, 02:03 AM	#3
Gordy diyAudio Member Join Date: Nov 2006	You have clearly put much work into your preamp. The external presentation is very good indeed - better than many expensive commercial units. Well done, and I hope you enjoy the fruits of your work.

6th January 2011, 11:59 AM	#4
Wisp diyAudio Member Join Date: Oct 2007	rclourenco, Very Nice !

6th January 2011, 01:22 PM	#5
SemperFi diyAudio Member Join Date: Jan 2002 Location: nowhere	gorgeous! Makes me feel like I've got ten thumbs...

6th January 2011, 01:45 PM	#6
Miniwatt diyAudio Member Join Date: Nov 2004 Location: Den Haag	More pictures please!

6th January 2011, 01:53 PM	#8
Stixx diyAudio Member Join Date: Sep 2003 Location: Southern Germany	shuweet!!

6th January 2011, 02:00 PM	#9
el156 diyAudio Member Join Date: Apr 2010 Location: ALBUFEIRA ;PORTUGAL	Muito Bonito ! Beautifull ! Parabens ! How about share the schematic with us? And more Pics ? Silvino

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