The Red Light District - another PP EL84 amp - Page 4

SY · 15th June 2006, 11:23 AM

Evangelos, my comments on the sound will be in the article that Bas is publishing. I'll say briefly that you will not believe that this is a 15W amp. There are several tricks (the LED array is one of them) which optimize the overload recovery characteristics so that clipping is almost un-noticeable.

Variac · 15th June 2006, 04:33 PM

I've never made a tube amp. This one might just be what pushes me to do so.

Poobah, The second symbol has four "feet" Which one are you referring to? We could refer to them as 1 is extreme left and 4 is extreme right.

anatech · 15th June 2006, 04:36 PM

Hi Mark,
Do it!
Even simple ones are rewarding.

-Chris

EsE · 15th June 2006, 05:25 PM

I'm also looking for a good amp to build. Wich transformers do you recommend for this amp? And I've never seen a screen like that before..

SY · 15th June 2006, 05:33 PM

You want something which is 8k plate-to-plate with a 15W or better rating. I used Dynaco iron and also tested UTC LS series. Both worked great. The next few will use James.

By adjusting the RC network on the plate of the first stage, you should be able to get any decent OPT of the right impedance to work.

pinkmouse · 15th June 2006, 05:52 PM

SY, you may have missed my question, but is there a reason you dropped the leds down from 7x7 to 7x6?

SY · 15th June 2006, 05:59 PM

I did miss it, sorry. The answer is a screw-up in the drawing.

As it happens, there's not much difference between 6 and 7 strings, about 5.5 ohm versus 4.5 ohm.

poobah · 15th June 2006, 06:11 PM

Variac,

You got it right bud... EC's layout was missing the small leftward extension on the bottom of the 3rd foot.

I have no dictionary with that symbol. The missing extension might change the meaning from "girl of service" to "cow for hire".

EC8010 · 15th June 2006, 06:42 PM

And I thought that little squiggle was a drawing error...

Andrewbee · 15th June 2006, 07:29 PM

"cow for hire" "red-light district" Oh My!

15th June 2006, 11:23 AM	#31
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Evangelos, my comments on the sound will be in the article that Bas is publishing. I'll say briefly that you will not believe that this is a 15W amp. There are several tricks (the LED array is one of them) which optimize the overload recovery characteristics so that clipping is almost un-noticeable. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

15th June 2006, 04:33 PM	#32
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	I've never made a tube amp. This one might just be what pushes me to do so. Poobah, The second symbol has four "feet" Which one are you referring to? We could refer to them as 1 is extreme left and 4 is extreme right. __________________ Burning Amp Festival Sunday, October 28th, 2012 in S.F. We need Volunteers & sign-up's for what you're bringing!

15th June 2006, 05:33 PM	#35
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	You want something which is 8k plate-to-plate with a 15W or better rating. I used Dynaco iron and also tested UTC LS series. Both worked great. The next few will use James. By adjusting the RC network on the plate of the first stage, you should be able to get any decent OPT of the right impedance to work. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

15th June 2006, 05:52 PM	#36
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	SY, you may have missed my question, but is there a reason you dropped the leds down from 7x7 to 7x6? __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

15th June 2006, 05:59 PM	#37
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	I did miss it, sorry. The answer is a screw-up in the drawing. As it happens, there's not much difference between 6 and 7 strings, about 5.5 ohm versus 4.5 ohm. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

15th June 2006, 04:36 PM	#33
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Mark, Do it! Even simple ones are rewarding. -Chris

15th June 2006, 05:25 PM	#34
EsE diyAudio Member Join Date: Apr 2005 Location: A cold place..	I'm also looking for a good amp to build. Wich transformers do you recommend for this amp? And I've never seen a screen like that before..

15th June 2006, 06:11 PM	#38
poobah diyAudio Member Join Date: Nov 2005	Variac, You got it right bud... EC's layout was missing the small leftward extension on the bottom of the 3rd foot. I have no dictionary with that symbol. The missing extension might change the meaning from "girl of service" to "cow for hire".

15th June 2006, 06:42 PM	#39
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	And I thought that little squiggle was a drawing error... __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

15th June 2006, 07:29 PM	#40
Andrewbee diyAudio Member Join Date: Apr 2002 Location: Cayman Islands	"cow for hire" "red-light district" Oh My! __________________ None of us are leaving this world alive. Enjoy it responsibly as you may.

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