Tube/Valve buffer with ECC88

formula 22 · 30th January 2012, 06:12 AM

Hi all!
I need schematics or project for Tube/Valve buffer with ECC88 or PCC88 that will be power supply Ucc=+/-25V.
Thanks and cheers!

revintage · 30th January 2012, 08:08 AM

+/-25V will give a sh-tty performance. Add a doubler on the positive side as it might work acceptable with +50V. Just check the Ua/Ia curves.

If you want a tube that works OK at low voltage you should go for 6N30.

Understand from your doublethread that this is for a Gainclone project.

And as someone else said, use Google. There are lots of, more or less, doubtful projects out there.

Audiofanatic · 30th January 2012, 09:08 AM

I hope it helps you a bit in the right direction !
Not my cup of tea but it works

Audiofanatic

Eli Duttman · 31st January 2012, 12:07 AM

Quote:

Originally Posted by formula 22

Hi all!
I need schematics or project for Tube/Valve buffer with ECC88 or PCC88 that will be power supply Ucc=+/-25V.
Thanks and cheers!

For use with a 25⁺ - 0 - 25^- bipolar PSU, the tube to use is the 6GM8/ECC86. Constant current sink (CCS) load, at 2 mA. each, the pair of cathode followers and you're pretty much done.

formula 22 · 1st February 2012, 11:27 AM

Quote:

Originally Posted by Audiofanatic

I hope it helps you a bit in the right direction !
Not my cup of tea but it works

Audiofanatic

Hello Audiofanatic!

Very intersting simple schematic!

Ist it your project if you have crated this project interst me how they behave steam harmonics in the amplifier?

Give please show graphs.

You'll be very greatefu!!!

formula 22 · 06:18 AM

Hello!
It has 2 pieces PCC88 and 2 pieces LM1875 and 1 pieces toroidal transformer with the 230Vac/2x18Vac/100VA . From all this i want to i create a hybrid audio amplifier, so please give suggestions on how all of this to close the stereo amplifier.
Thank you for your cooperation !

P.S.
Is it can be replacet 6922 with PCC88 or ECC88?

planet10 · 15th February 2012, 06:27 AM

6922 ~ 6DJ8 ~ ECC88

You can create an ~ 50-0-50 set of rails for the tube by using voltage doublers on each rail on the tube section of the XO and get much better results.

dave

gingertube · 05:11 AM

Look at the Music Fidelity X10D
Thread with schemtics here:
musical fidelity x10d schematic
The one I traced the circuit for (posted in that thread) used 6AQ8 but usually came with ECC88. +/-24V rails in that design.
Cheers,
Ian

30th January 2012, 06:12 AM	#1
formula 22 diyAudio Member Join Date: Sep 2011 Location: El Triunfo	Tube/Valve buffer with ECC88 Hi all! I need schematics or project for Tube/Valve buffer with ECC88 or PCC88 that will be power supply Ucc=+/-25V. Thanks and cheers!

30th January 2012, 08:08 AM	#2
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	+/-25V will give a sh-tty performance. Add a doubler on the positive side as it might work acceptable with +50V. Just check the Ua/Ia curves. If you want a tube that works OK at low voltage you should go for 6N30. Understand from your doublethread that this is for a Gainclone project. And as someone else said, use Google. There are lots of, more or less, doubtful projects out there. __________________ Brgds Lars

15th February 2012, 06:10 AM	#6
formula 22 diyAudio Member Join Date: Sep 2011 Location: El Triunfo	Hybryd amplifier with PCC88 and LM1875 Hello! It has 2 pieces PCC88 and 2 pieces LM1875 and 1 pieces toroidal transformer with the 230Vac/2x18Vac/100VA . From all this i want to i create a hybrid audio amplifier, so please give suggestions on how all of this to close the stereo amplifier. Thank you for your cooperation ! P.S. Is it can be replacet 6922 with PCC88 or ECC88? Last edited by formula 22; 15th February 2012 at 06:18 AM.

15th February 2012, 06:27 AM	#7
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	6922 ~ 6DJ8 ~ ECC88 You can create an ~ 50-0-50 set of rails for the tube by using voltage doublers on each rail on the tube section of the XO and get much better results. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

16th February 2012, 05:09 AM	#8
gingertube diyAudio Member Join Date: Oct 2004 Location: Adelaide South Oz	Look at the Music Fidelity X10D Thread with schemtics here: musical fidelity x10d schematic The one I traced the circuit for (posted in that thread) used 6AQ8 but usually came with ECC88. +/-24V rails in that design. Cheers, Ian Last edited by gingertube; 16th February 2012 at 05:11 AM.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
ECC88 tube buffer NEEDED !	vmed_cha_gr	Tubes / Valves	25	14th December 2011 04:01 PM
Comments on 6gk5/Ecc88 Valve Phono Amp	velvetsunrise	Analogue Source	1	9th January 2010 03:37 PM
Tube socket for ECC88, drawing	peranders	Tubes / Valves	7	10th August 2009 01:59 PM
Valve Buffer amp	Brit01	Tubes / Valves	5	6th September 2008 09:09 PM
buffer stage ECC88 or ECC83?	KevinTams	Tubes / Valves	4	27th August 2005 12:09 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read