stereo SE kt88 build ... abdellah diyaudioprojects design - Page 6

revintage · 02:26 PM

Quote:

on your site the operating point

Hey Phillipe,

Nikolas site is great!

I´d absolutely replace the 6N1P with a 6DJ8/6N23 if we go from the measurements

. But one have to redesign the circuit to suit them.

revintage · 20th October 2009, 02:55 PM

If we go by Nicolas curves, a Rk of 470ohm(-75/+80V swing/5mA) would be far better than the 1k in the original.

PhilippeS · 20th October 2009, 02:57 PM

Sorry for the confusion (and my poor english), I meant "the site you talk about.

Thanks for "redesign the circuit to suit them."

Philippe

jmillerdoc · 20th October 2009, 06:40 PM

The original design and schematics I found for this amp at diyaudioprojects.com has a line at the bottom of the page where the builder preferred a 6DJ8 Amprerex Bugle Boy tube. I presume it must work in this amp because of the authors comments.
Thanks,
Jeff

88man · 09:42 PM

Do you have to use polarized electrolytics for bypass caps for the 100uF/25V and 220uF/63V values?...

Can you use non-polar MKP capacitor instead, like Mundorf MKP Supreme, Auricaps, or Clarity PX, or Solen Fast Caps without degradation?...

I can't find values for Black Gate caps since they've been long out of production. Any advice on top tier alternatives?...

jmillerdoc · 25th October 2009, 01:23 AM

I like Elna Cerafine, large selection at Partsconnexion. Also Nichicon KZ Muse does well too. Check out the above vendor, lots of nice stuff there.

jmillerdoc · 25th October 2009, 01:27 AM

Here is a sloppy pic from an Iphone of my chassis, ready to go. I will try to post some better pics later when I have access to my camera. The wood from bottom to top is Cedar, Canary, Rosewood, Canary, Madera, and Oak. You can see my hugh, ugly, 200mA 10H Westinghouse choke mounted up underneath. I just got all of the parts in a couple of days ago, should have her together in a week or so.
Jeff

jmillerdoc · 25th October 2009, 07:14 AM

So if I wanted to use my 6DJ8, what changes would you reccommend in the circuit?

revintage · 25th October 2009, 09:07 AM

Just adjust Rk to get between 120 and 150V Ua. Probably in the ballpark of 500ohms.

88man · 25th October 2009, 05:17 PM

Thanks Jeff for suggesting the Elna-Cerafine and the Nichicon KZ Muse caps. I'll try Partsconnexion. I've heard the Elna-Cerafines have 98% of the sonic attribuites of the Black Gates. I wonder how they measured that, but it seems good enough!... Oh, hey I see you've put the cart before the horse, but the enclosure looks distinctive.

20th October 2009, 02:55 PM	#52
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	If we go by Nicolas curves, a Rk of 470ohm(-75/+80V swing/5mA) would be far better than the 1k in the original. __________________ Brgds Lars

24th October 2009, 09:39 PM	#55
88man diyAudio Member Join Date: Aug 2009 Location: Boston	Do you have to use polarized electrolytics for bypass caps for the 100uF/25V and 220uF/63V values?... Can you use non-polar MKP capacitor instead, like Mundorf MKP Supreme, Auricaps, or Clarity PX, or Solen Fast Caps without degradation?... I can't find values for Black Gate caps since they've been long out of production. Any advice on top tier alternatives?... Last edited by 88man; 24th October 2009 at 09:42 PM.

25th October 2009, 09:07 AM	#59
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	Just adjust Rk to get between 120 and 150V Ua. Probably in the ballpark of 500ohms. __________________ Brgds Lars

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20th October 2009, 02:57 PM	#53
PhilippeS diyAudio Member Join Date: Aug 2008	Sorry for the confusion (and my poor english), I meant "the site you talk about. Thanks for "redesign the circuit to suit them." Philippe

20th October 2009, 06:40 PM	#54
jmillerdoc diyAudio Member Join Date: Mar 2009 Location: Lawton, OK, USA	The original design and schematics I found for this amp at diyaudioprojects.com has a line at the bottom of the page where the builder preferred a 6DJ8 Amprerex Bugle Boy tube. I presume it must work in this amp because of the authors comments. Thanks, Jeff

25th October 2009, 01:23 AM	#56
jmillerdoc diyAudio Member Join Date: Mar 2009 Location: Lawton, OK, USA	I like Elna Cerafine, large selection at Partsconnexion. Also Nichicon KZ Muse does well too. Check out the above vendor, lots of nice stuff there.

25th October 2009, 07:14 AM	#58
jmillerdoc diyAudio Member Join Date: Mar 2009 Location: Lawton, OK, USA	So if I wanted to use my 6DJ8, what changes would you reccommend in the circuit?

25th October 2009, 05:17 PM	#60
88man diyAudio Member Join Date: Aug 2009 Location: Boston	Thanks Jeff for suggesting the Elna-Cerafine and the Nichicon KZ Muse caps. I'll try Partsconnexion. I've heard the Elna-Cerafines have 98% of the sonic attribuites of the Black Gates. I wonder how they measured that, but it seems good enough!... Oh, hey I see you've put the cart before the horse, but the enclosure looks distinctive.

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