829B SE Comments????

coldcathode · 14th February 2009, 03:02 AM

Ok,

Pick it apart!!!

DigitalJunkie · 14th February 2009, 03:06 AM

The output of the 'SJ7 is shorted to ground! I'm assuming you meant to put a grid-leak resistor there?
Also,you might want to put a 100ohm resistor in series with the screen grid,to limit current,and help suppress any trend towards oscillation.

Just a couple things I spotted with a quick once-over.

astouffer · 14th February 2009, 03:06 AM

Its going to be very quiet

rcavictim · 14th February 2009, 03:12 AM

Is this a test? It won't play as drawn. Hint, follow the signal path from the 6SK7 plate to the 829 grid stop resistor.

Also, I think you need to put a separate grid stopper on each socket pin of the tube's two G1's.

coldcathode · 14th February 2009, 03:19 AM

I knew I forgot some things!!

The wife grabbed me earlier to go to the mall and I forgot where I left off translating my chicken scratch notes to a .jpg!!

Sorry, It was not a test!

Please see if I forgot anything else and tell me what you think!

dshortt9 · 14th February 2009, 03:40 AM

829B Based Amp

Interesting info here. 829 is like 2 807's which I can find a triode graph for.

dshortt9 · 14th February 2009, 03:43 AM

http://www.tubezone.net/pdf/807curv.pdf

Here.

Tubes4e4 · 14th February 2009, 07:20 AM

Quote:

Originally posted by dshortt9
829B Based Amp
Interesting info here. 829 is like 2 807's which I can find a triode graph for.

Huh? Why not use a triode strapped 829 plot in the first place? Look here.

Regards,

Tom Schlangen

oldeurope · 14th February 2009, 08:49 AM

Thanks Tom for the curves.

Hello Coldcathode,
why did you take 3K load impedance?

Kind regards,
Darius

coldcathode · 14th February 2009, 01:21 PM

3K impededance was what I have in a nice size set of OPT's (not sure what they are from but they are pretty heavy)

They have a few taps so I will look at the new curves and see what happens.

My main question here is am I on the right track?

14th February 2009, 03:12 AM	#4
rcavictim diyAudio Member Join Date: Jun 2004 Location: Cool end of a soldering iron NW of Toronto	Is this a test? It won't play as drawn. Hint, follow the signal path from the 6SK7 plate to the 829 grid stop resistor. Also, I think you need to put a separate grid stopper on each socket pin of the tube's two G1's. __________________ I.Q.Test. Have you ever purchased a recreational snowmobile?

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
829B Based Amp	silverchris	Tubes / Valves	11	12th March 2012 10:26 AM
829B as LTP?	DrewP	Tubes / Valves	10	17th June 2009 07:00 PM
rca 829b bias ? Audioromy 828	oleslot	Tubes / Valves	3	14th April 2009 02:13 PM
829B tubes for audio?	webercarbmann	Tubes / Valves	6	16th February 2002 10:34 PM

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

14th February 2009, 03:06 AM	#2
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	The output of the 'SJ7 is shorted to ground! I'm assuming you meant to put a grid-leak resistor there? Also,you might want to put a 100ohm resistor in series with the screen grid,to limit current,and help suppress any trend towards oscillation. Just a couple things I spotted with a quick once-over.

14th February 2009, 03:40 AM	#6
dshortt9 diyAudio Member Join Date: Apr 2001 Location: Milwaukee, Wisconsin	829B Based Amp Interesting info here. 829 is like 2 807's which I can find a triode graph for.

14th February 2009, 03:43 AM	#7
dshortt9 diyAudio Member Join Date: Apr 2001 Location: Milwaukee, Wisconsin	http://www.tubezone.net/pdf/807curv.pdf Here.

14th February 2009, 08:49 AM	#9
oldeurope diyAudio Member Join Date: Mar 2008	Thanks Tom for the curves. Hello Coldcathode, why did you take 3K load impedance? Kind regards, Darius

14th February 2009, 01:21 PM	#10
coldcathode diyAudio Member Join Date: Jan 2009	3K impededance was what I have in a nice size set of OPT's (not sure what they are from but they are pretty heavy) They have a few taps so I will look at the new curves and see what happens. My main question here is am I on the right track?

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