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211 SE power amp
http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=4514
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Author:  mwhouston [ 21 Sep 2013, 22:43 ]
Post subject:  Re: 211 SE power amp

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.

Author:  Suncalc [ 22 Sep 2013, 14:29 ]
Post subject:  Re: 211 SE power amp

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.

Author:  Geek [ 22 Sep 2013, 16:37 ]
Post subject:  Re: 211 SE power amp

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!

Author:  Suncalc [ 22 Sep 2013, 18:08 ]
Post subject:  Re: 211 SE power amp

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.

Author:  Geek [ 22 Sep 2013, 21:01 ]
Post subject:  Re: 211 SE power amp

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.

Author:  Suncalc [ 22 Sep 2013, 21:47 ]
Post subject:  Re: 211 SE power amp

Geek wrote:
Edcor will not wind that high anymore, citing safety reasons.
I hate lawyers! :evil:

Author:  Geek [ 23 Sep 2013, 01:41 ]
Post subject:  Re: 211 SE power amp

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! :(

Author:  mwhouston [ 23 Sep 2013, 03:25 ]
Post subject:  Re: 211 SE power amp

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?

Author:  Geek [ 23 Sep 2013, 07:55 ]
Post subject:  Re: 211 SE power amp

No, owner of Edcor.

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

They're in Carlsbad, New Mexico, USA.

Cheers!

Author:  mwhouston [ 23 Sep 2013, 08:47 ]
Post subject:  Re: 211 SE power amp

Geek wrote:
No, owner of Edcor.

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

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