Valves' world

Hojvaelde · 08:41 AM

Hello

Has some tried to build / hear the attached amplifier. The diagram is from Japanese Valves' world.

I like the simple design and the use of small power tubes as drivers.

I will use 6BG6G as output tubes.

Regards

Benny

Geek · 30th November 2009, 09:55 AM

Pretty straightforward

(If people are having trouble seeing the attachment, use "Open Image"... it clears it up

)

Cheers!

kavermei · 30th November 2009, 12:02 PM

The layout looks fairly standard. I think the sound would be largely determined by the amount of feedback, the quiescent currents of the tubes, and the tube types.

Hojvaelde · 30th November 2009, 12:50 PM

Hey

Oh. I think 50 mA will be fine for the 6BG6G tubes.

Benny

tomlang · 30th November 2009, 01:24 PM

I've been contemplating a similar project using Super 6GB6GA's here:

6BG6 To 6L6 Vacuum Tube List

richwalters · 30th November 2009, 07:15 PM

Hojvaelde.
My system XP detects this as a corrupt GIF image which is normally openable. However it ignores it. So Lets have an image compatible with maintream users.

richy

Hojvaelde · 30th November 2009, 08:48 PM

Hey

Yes tomlang.

I like topcaps. I have a 5 channel amp for my 5.1 system. I use PL36 in push pull.

The last channel (subs) is still in sand.

I have another question. If I change from self-biasing to fixet bias.
Are there any possible mistakes, I must be careful with this change in the schematic?

Regards

Benny

pointy · 30th November 2009, 11:17 PM

rich walters

click it once so it goes black
then right click............................then click on VEIW IMAGE

that's how i got it to open.

kavermei · 30th November 2009, 11:30 PM

Quote:

Originally Posted by Hojvaelde

Hey
I have another question. If I change from self-biasing to fixet bias.
Are there any possible mistakes, I must be careful with this change in the schematic?

Fixed bias will require a manual adjustment of the bias currents every now and then, and also when changing the output tubes.

Secondly, if you regulate the bias supply, then you should also regulate the screen grid supply. Or don't regulate either: this assures that any plate current increase due to a rising screen voltage is countered by a more negative bias voltage (and vice versa).

Finally, the sound will be different.

Miles Prower · 1st December 2009, 02:23 AM

It looks like a simplified version of an 807-based design I did. The only things I'd like to see there that aren't there are an active tail load for the LTP, and local NFB. The whole 6L6/807/6BG6 family likes to make higher order harmonics, and can definitely use the extra help that local NFB provides.

Active screen regulation would also be an improvement, but then you're moving away from a basic amp.

1st December 2009, 02:23 AM	#10
Miles Prower diyAudio Member Join Date: May 2005 Location: USA Blog Entries: 2	It looks like a simplified version of an 807-based design I did. The only things I'd like to see there that aren't there are an active tail load for the LTP, and local NFB. The whole 6L6/807/6BG6 family likes to make higher order harmonics, and can definitely use the extra help that local NFB provides. Active screen regulation would also be an improvement, but then you're moving away from a basic amp. __________________ There are no foxes in atheistholes www.dolphin-hsl.com

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
Valves	Professor smith	Pass Labs	47	10th June 2009 10:58 PM
Valves World question	nkg	Tubes / Valves	1	3rd March 2008 09:16 PM
Which valves for MF CD-T	paultb10	Tubes / Valves	1	7th October 2007 04:42 PM
First amp for a new in valves	JORGETronic	Tubes / Valves	2	12th June 2006 01:38 AM
813 valves	slowmotion	Tubes / Valves	36	27th January 2003 11:54 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

30th November 2009, 09:55 AM	#2
Geek diyAudio Member Join Date: Sep 2004	Pretty straightforward (If people are having trouble seeing the attachment, use "Open Image"... it clears it up ) Cheers!

30th November 2009, 12:02 PM	#3
kavermei diyAudio Member Join Date: Jan 2005 Location: Lokeren, Belgium	The layout looks fairly standard. I think the sound would be largely determined by the amount of feedback, the quiescent currents of the tubes, and the tube types.

30th November 2009, 12:50 PM	#4
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	Hey Oh. I think 50 mA will be fine for the 6BG6G tubes. Benny

30th November 2009, 01:24 PM	#5
tomlang diyAudio Member Join Date: Oct 2009 Location: Augusta, GA	I've been contemplating a similar project using Super 6GB6GA's here: 6BG6 To 6L6 Vacuum Tube List

30th November 2009, 07:15 PM	#6
richwalters diyAudio Member Join Date: Sep 2003 Location: Alps:Tube amp designs over 150W, SMPS guru.	Hojvaelde. My system XP detects this as a corrupt GIF image which is normally openable. However it ignores it. So Lets have an image compatible with maintream users. richy

30th November 2009, 08:48 PM	#7
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	Hey Yes tomlang. I like topcaps. I have a 5 channel amp for my 5.1 system. I use PL36 in push pull. The last channel (subs) is still in sand. I have another question. If I change from self-biasing to fixet bias. Are there any possible mistakes, I must be careful with this change in the schematic? Regards Benny

30th November 2009, 11:17 PM	#8
pointy diyAudio Member Join Date: Mar 2009	rich walters click it once so it goes black then right click............................then click on VEIW IMAGE that's how i got it to open.

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