All DHT Phono Stage - Page 3

Salas · 31st July 2009, 05:03 PM

Golden ones on a Steve Bench, almost same like Sheldon's circuit.

brommermartin · 26th January 2013, 05:48 PM

I'm going to build the 3A5 phono stage (Dmitry nizhegorodon)with the SSHV2 power supply's, and the Rod Coleman filament supply's.
Any tips are welcome

Sheldon · 26th January 2013, 08:55 PM

Here's mine: Unholy Alliance Phono Amp

Might be some ideas in there. I did end up putting the decoupling 10m caps in the cathode. With my basic CCS they did eliminate a slight hum. With a Coleman style reg, probably not necessary.

Sheldon

211hojbjerg · 27th January 2013, 12:37 PM

Hi dht,
You should check out Thoms Meyer blog, wher he have designed a all DHT system with LCR riia. Using 841 and 801 in the stage before the LCR riia.
Best regards
Karsten

brommermartin · 28th January 2013, 07:45 PM

Thanks sheldon

I will build the phono stage like your schematic but
With Rod Coleman filament units and the Salas sshv2 units.
Thomas makes very nice amps but with a different price tag then this project.
He recommended the use of the 10Y driver for my 45 amp , the sound of the amp is amazing

Sheldon · 28th January 2013, 08:35 PM

Quote:

Originally Posted by brommermartin

I will build the phono stage like your schematic but With Rod Coleman filament units and the Salas sshv2 units.

Nice. Keep us posted. Do you intend to use a gyrator or ccs on the output stage, or resistor loaded. If your next stage has an input impedance around 100k or more, resistor load will do.

Sheldon

brommermartin · 29th January 2013, 01:57 PM

I will go for resistor loading the last stage as my 4p1l preamp has a potmeter of 100k

brommermartin · 31st March 2013, 05:22 PM

The phono amp is playing now for a couple of hours and the sound is very nice

No microfonics but only a small hum, that's likely because there is no housing for screening.
The sound stage is deep with good dynamics

Sheldon · 31st March 2013, 06:31 PM

Nice!

kevinkr · 31st March 2013, 07:28 PM

Mount the supplies in one box and the phono stage itself in another and it will be absolutely silent I'd wager.. Do locate the Coleman CCS in the box with the phono stage, the SSHV2 could go in either as long as the DC feeding it is quiet. I use an SSHV2 in my dac where it is located in the dac chassis rather than the psu chassis and it works well.

31st March 2013, 07:28 PM	#30
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Mount the supplies in one box and the phono stage itself in another and it will be absolutely silent I'd wager.. Do locate the Coleman CCS in the box with the phono stage, the SSHV2 could go in either as long as the DC feeding it is quiet. I use an SSHV2 in my dac where it is located in the dac chassis rather than the psu chassis and it works well. __________________ "Extraordinary claims require extraordinary evidence." - Carl Sagan

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31st July 2009, 05:03 PM	#21
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Golden ones on a Steve Bench, almost same like Sheldon's circuit.

26th January 2013, 05:48 PM	#22
brommermartin diyAudio Member Join Date: Sep 2009	I'm going to build the 3A5 phono stage (Dmitry nizhegorodon)with the SSHV2 power supply's, and the Rod Coleman filament supply's. Any tips are welcome

26th January 2013, 08:55 PM	#23
Sheldon diyAudio Member Join Date: Dec 2003 Location: San Diego	Here's mine: Unholy Alliance Phono Amp Might be some ideas in there. I did end up putting the decoupling 10m caps in the cathode. With my basic CCS they did eliminate a slight hum. With a Coleman style reg, probably not necessary. Sheldon

27th January 2013, 12:37 PM	#24
211hojbjerg diyAudio Member Join Date: May 2010	Hi dht, You should check out Thoms Meyer blog, wher he have designed a all DHT system with LCR riia. Using 841 and 801 in the stage before the LCR riia. Best regards Karsten

28th January 2013, 07:45 PM	#25
brommermartin diyAudio Member Join Date: Sep 2009	Thanks sheldon I will build the phono stage like your schematic but With Rod Coleman filament units and the Salas sshv2 units. Thomas makes very nice amps but with a different price tag then this project. He recommended the use of the 10Y driver for my 45 amp , the sound of the amp is amazing

29th January 2013, 01:57 PM	#27
brommermartin diyAudio Member Join Date: Sep 2009	I will go for resistor loading the last stage as my 4p1l preamp has a potmeter of 100k

31st March 2013, 06:31 PM	#29
Sheldon diyAudio Member Join Date: Dec 2003 Location: San Diego	Nice!