DIY Audio Projects Forum
 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

DIY Audio Projects Forum

Welcome to the DIY Audio Projects Message Forum. Use these forums to discuss Hi-Fi audio and to share your DIY Audio Projects. Registration is free and required to post messages and view the file attachments. Registration will only take a minute and registered users do not see any advertisements. After you have completed the online registration process, check your email (including spam/junk folder) for the verification email to activate your account. New members are under moderation - so your posts will not be visible until approved by a moderator. See the Read Me 1st, Forum RULES and Forum FAQ to get started on the forum.

It is currently 20 Apr 2018, 01:52

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 167 posts ]  Go to page Previous  1 ... 4, 5, 6, 7, 8, 9, 10 ... 17  Next
Author Message
PostPosted: 07 Mar 2009, 00:30 
Offline

Joined: 26 Aug 2008, 20:57
Posts: 415
Location: Atlanta
People do claim that discrete single diodes do a better job than bridge rectifiers...I have not experimented.

I would think that power supply capacitance would affect sound quality due to transient response ability.

Don't forget that noise floor also affects sound...if you have a hum at a certain decibel level then your amp is working to supply that hum which will not only take away from sound quality but also dynamic range. For example an amp with an 80dB S/N ratio has a 25dB disadvantage to an amp with 105dB S/N.


Top
 Profile  
 
PostPosted: 07 Mar 2009, 03:59 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 4865
Location: Australia
billnchristy wrote:
People do claim that discrete single diodes do a better job than bridge rectifiers...I have not experimented.

I would think that power supply capacitance would affect sound quality due to transient response ability.

Don't forget that noise floor also affects sound...if you have a hum at a certain decibel level then your amp is working to supply that hum which will not only take away from sound quality but also dynamic range. For example an amp with an 80dB S/N ratio has a 25dB disadvantage to an amp with 105dB S/N.

When an amplifier is only a power supply modulator - what do you think??

_________________
Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
Website: retro-thermionic


Top
 Profile  
 
PostPosted: 07 Mar 2009, 14:13 
Offline

Joined: 27 Feb 2009, 10:52
Posts: 26
Location: Edmonton, Canada
Hi Bill,

What is the model of your Edcor power tranny? Is it XPWR105?

Thanks


Top
 Profile  
 
PostPosted: 08 Mar 2009, 03:46 
Offline

Joined: 26 Aug 2008, 20:57
Posts: 415
Location: Atlanta
Yes, it is a 105.


Top
 Profile  
 
PostPosted: 10 Mar 2009, 11:28 
Offline

Joined: 27 Feb 2009, 10:52
Posts: 26
Location: Edmonton, Canada
Hi Bill and Mark,

Thanks for all your answers. One more question please. This is for a totally different application, where I need 360 ac output from the transofrmer.

Can I use the same Edcor 105 without the centre tap and use a bridge rectifier and some filter circuit to get 350VDC that I need? I am ordering the trannies for 6T9 amp, so I can just order one more 105 from them. Theoretically I can just ignore the centre tap and use it, but are there any practical issues? Are these centre tapped ones designed to be used without the taps?

Thanks once again.


Top
 Profile  
 
PostPosted: 10 Mar 2009, 15:20 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 4865
Location: Australia
akhihar wrote:
Thanks for all your answers. One more question please. This is for a totally different application, where I need 360 ac output from the transofrmer.

Can I use the same Edcor 105 without the centre tap and use a bridge rectifier and some filter circuit to get 350VDC that I need? I am ordering the trannies for 6T9 amp, so I can just order one more 105 from them. Theoretically I can just ignore the centre tap and use it, but are there any practical issues? Are these centre tapped ones designed to be used without the taps?

To get 360V DC you need about a 340V power tranni.And use the center tap. Remeber that once rectified with caps the unloaded voltage will be a lot higher. Try what you have. I don't know the tranni.

_________________
Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
Website: retro-thermionic


Top
 Profile  
 
PostPosted: 15 Mar 2009, 09:38 
Offline

Joined: 27 Feb 2009, 10:52
Posts: 26
Location: Edmonton, Canada
Hi 6T9 experts,

I have finally ordered the material for 6T9 SE amp, but the material is going to arrive only after 3 weeks. I am going ahead with Bill's power supply with Edcor tranny.

But, I have still a couple of questions. Could you guys help?

1. I haven't found the suitable wire for the wiring. What kind of wiring should I use for all audio part? Shielded single core? Or any twisted pair? Should all the wiring done by same type of wire? I live in Edmonton, Canada, so can someone please throw some ideas on where I can get the suitable wire? Obviosly I just need a couple of meters of it.

2. As per sparetimegizmo's article, the signal ground should be separate from the safety ground. He adivises to use some insulation between the chassis and the inout RCA connectors and connect the safety ground wire from the power cord to the chassis. In that case, where is the signal grounded? In the input device like the CD player, through the input wiring? I need some more clarification please.

Thanks a lot.


Top
 Profile  
 
PostPosted: 16 Mar 2009, 03:24 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 4865
Location: Australia
You will hate my answer to hook-up wire:

Firstly I generally use OFC medium gauge speaker wire for power hook-up and heat-shrink covered polished pure silver wire for the audio path.

The mains earth should be connected to the chassis to stop electrocution if the chassis tries to go live. The PS negative (or ground) should only be connect to the amp and earth of the speaker and input terminals. In other words the chassis earth and PS earth remain separate. I have mixed the two with no problems.

_________________
Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
Website: retro-thermionic


Top
 Profile  
 
PostPosted: 18 Mar 2009, 17:16 
Offline

Joined: 18 Mar 2009, 17:10
Posts: 5
Hello everyone,

I am new to the DIY scene (and tubes for that matter) but have been interested in hifi for many years. I am looking at building something like the 6T9 project, but I think I am going to need more power. I currently have a pair of B&W 685s which have a sensitivity of 88dB. I usually play them at low to medium volume levels, so I don't need a ton of power.

Any advice would be greatly appreciated.

Jeff


Top
 Profile  
 
PostPosted: 18 Mar 2009, 20:37 
Offline
Moderator
User avatar

Joined: 02 Sep 2008, 14:34
Posts: 527
Location: Rochester, NY
Jeff,

The issue with the 6T9 amp is the availability of the tubes, or in this case the lack of availability. They have become hard to find. So, strictly from that perspective I would not recommend building anything using the 6T9. There are other great amps out there depending on your budget and listening room. Keep looking and read through the forums.

Alan

_________________
Cheers, Alan
.
Denon POA 2200 | Bottlehead Quickie with PJCCS | Integra CDC 3.1 | SOTA Sapphire-RG301-Grado Gold 1 | Soundwave Soliloquy Series I


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 167 posts ]  Go to page Previous  1 ... 4, 5, 6, 7, 8, 9, 10 ... 17  Next

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: poty and 14 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
cron
DIY Tube Projects :: DIY Tube Amp Kits :: DIY Speaker Projects :: DIY Solid State Projects :: DIY IC / Op-amp Projects :: DIY Phono Projects :: DIY Cable Projects :: Hi-Fi Audio Schematics
© diyAudioProjects.com - Terms of Service - Privacy Policy