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 15 Dec 2019, 01:07

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 62 posts ]  Go to page Previous  1, 2, 3, 4, 5 ... 7  Next
Author Message
 Post subject: Re: 211 SE power amp
PostPosted: 21 Sep 2013, 22:43 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 5151
Location: Australia
gofar99 wrote:
You know you have enough power output when the lights dim on peak bass notes.

'Enuf nonsense now. It looks like it might be a great project. SE things are not my bag, but something monstrous or at the very least cool looking might find a way to my bench.

I would love to see what you come up with. The tubes are not expensive but the iron may have you selling the house.

_________________
Projects: "Precision" - 300W Class AB Holton power amp | "retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp |


Top
 Profile  
 
 Post subject: Re: 211 SE power amp
PostPosted: 22 Sep 2013, 14:29 
Offline
Project Author
User avatar

Joined: 06 Apr 2009, 10:08
Posts: 1596
Location: US Pacific Northwest
mwhouston wrote:
I had a toroid wound to 1200V for the HT...
So Mark, when you say 1200v do you mean a center taped secondary (like 1200-0-1200) or do you mean a single ended secondary (like 0-1200)? My initial amp design puts out 20W per channel with 59mA of idle current through each tube, but the total B+ requirement is 1350v (Vp=1259v). If your toroid is 1200-0-1200 I can work with that. If it's 0-1200 I'm going to have to go to four 6AX4 tubes for full wave rectification (i.e. the power supply is going to get BIG).

Please let me know which configuration you have.

_________________
Matt
It's all about the Glass!
http://www.CascadeTubes.com
Cascade Tubes Blog


Top
 Profile  
 
 Post subject: Re: 211 SE power amp
PostPosted: 22 Sep 2013, 16:37 
Offline
User avatar

Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
Suncalc wrote:
mwhouston wrote:
I had a toroid wound to 1200V for the HT...
So Mark, when you say 1200v do you mean a center taped secondary (like 1200-0-1200) or do you mean a single ended secondary (like 0-1200)?


If it's 1200-0-1200, I'm interested too as I can't get Edcor's for the power iron anymore for 845 commissions :(

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


Top
 Profile  
 
 Post subject: Re: 211 SE power amp
PostPosted: 22 Sep 2013, 18:08 
Offline
Project Author
User avatar

Joined: 06 Apr 2009, 10:08
Posts: 1596
Location: US Pacific Northwest
Geek wrote:
If it's 1200-0-1200, I'm interested too as I can't get Edcor's for the power iron anymore for 845 commissions
Have you looked at the Hammond 732/733 transformers? They are 2500vct at 200mA/300Ma. You could order these direct or through Newark. Also note that Edcor will custom wind transformers to your specifications for not much more; and the NRE is only charged on the first one.

_________________
Matt
It's all about the Glass!
http://www.CascadeTubes.com
Cascade Tubes Blog


Top
 Profile  
 
 Post subject: Re: 211 SE power amp
PostPosted: 22 Sep 2013, 21:01 
Offline
User avatar

Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
I'm in Canada, I can get them straight from Hammond ;)

Yeah, that's what I would have to get.

Edcor will not wind that high anymore, citing safety reasons.

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


Top
 Profile  
 
 Post subject: Re: 211 SE power amp
PostPosted: 22 Sep 2013, 21:47 
Offline
Project Author
User avatar

Joined: 06 Apr 2009, 10:08
Posts: 1596
Location: US Pacific Northwest
Geek wrote:
Edcor will not wind that high anymore, citing safety reasons.
I hate lawyers! :evil:

_________________
Matt
It's all about the Glass!
http://www.CascadeTubes.com
Cascade Tubes Blog


Top
 Profile  
 
 Post subject: Re: 211 SE power amp
PostPosted: 23 Sep 2013, 01:41 
Offline
User avatar

Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
Suncalc wrote:
Geek wrote:
Edcor will not wind that high anymore, citing safety reasons.
I hate lawyers! :evil:


LOL! I bet that's the reason too.

I tried to reassure Brian Weston that at the yearly checkup, his one-and-only HV tranny was doing fine and there was no sign of ozone degradation or carbon, but nope! :(

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


Top
 Profile  
 
 Post subject: Re: 211 SE power amp
PostPosted: 23 Sep 2013, 03:25 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 5151
Location: Australia
Geek wrote:
I tried to reassure Brian Weston that at the yearly checkup, his one-and-only HV tranny was doing fine and there was no sign of ozone degradation or carbon, but nope! :(

Brian Weston from Victoria Australia?

_________________
Projects: "Precision" - 300W Class AB Holton power amp | "retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp |


Top
 Profile  
 
 Post subject: Re: 211 SE power amp
PostPosted: 23 Sep 2013, 07:55 
Offline
User avatar

Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
No, owner of Edcor.

There's Brian, Larry, Phyllis and Lucy Weston that own the place.

They're in Carlsbad, New Mexico, USA.

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


Top
 Profile  
 
 Post subject: Re: 211 SE power amp
PostPosted: 23 Sep 2013, 08:47 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 5151
Location: Australia
Geek wrote:
No, owner of Edcor.

Silly me:http://www.westonacoustics.com just down the road from me.

_________________
Projects: "Precision" - 300W Class AB Holton power amp | "retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp |


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 62 posts ]  Go to page Previous  1, 2, 3, 4, 5 ... 7  Next

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: Majestic-12 [Bot] and 21 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