Need help in trouble-shooting my AES Sixpacs amp

andy2 · 8th January 2007, 04:41 AM

What happened was I tried to bias the amp, using a mini jack on the bac of the amp, but all of a sudden the bias was jumping all over the place. In a moment of panic, I pulled out the mini jack. At that moment, the tubes were flashing.

Now, the bias point won't go beyond 160ma. The optimal recommended value is 260ma. When I turn on the amp, there is no sound. I think 160ma is below the operating point of the tubes.

Does anyone have the schematic of the AES Sixpac amp?

Where should I begin looking at first.

andy2 · 12th January 2007, 04:10 AM

bump

Alastair E · 12th January 2007, 09:52 AM

Have you checked the bias-pots....Sounds like they could be 'noisy' and during your adjustment have killed the O/P tubes....

As a start, check all supplies and fuses/fusables, then go on to the bias network, tubes etc..

Just a thought....

8th January 2007, 04:41 AM	#1
andy2 diyAudio Member Join Date: Nov 2004 Location: Los Angeles	Need help in trouble-shooting my AES Sixpacs amp What happened was I tried to bias the amp, using a mini jack on the bac of the amp, but all of a sudden the bias was jumping all over the place. In a moment of panic, I pulled out the mini jack. At that moment, the tubes were flashing. Now, the bias point won't go beyond 160ma. The optimal recommended value is 260ma. When I turn on the amp, there is no sound. I think 160ma is below the operating point of the tubes. Does anyone have the schematic of the AES Sixpac amp? Where should I begin looking at first.

12th January 2007, 09:52 AM	#3
Alastair E diyAudio Member Join Date: Feb 2004 Location: South Wales	Have you checked the bias-pots....Sounds like they could be 'noisy' and during your adjustment have killed the O/P tubes.... As a start, check all supplies and fuses/fusables, then go on to the bias network, tubes etc.. Just a thought.... __________________ Das Beste Oder Nichts

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
Op amp trouble shooting	Bose(o)	Chip Amps	13	1st April 2005 07:37 PM
trouble shooting my DD receiver	kslim	Solid State	0	1st December 2004 12:21 AM
Help trouble shooting	Christof	Tubes / Valves	11	1st September 2004 02:27 AM
need some trouble shooting help	Jean	Solid State	41	7th October 2002 04:53 AM
Trouble shooting help	NerdMike	Solid State	2	29th September 2002 12:34 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

12th January 2007, 04:10 AM	#2
andy2 diyAudio Member Join Date: Nov 2004 Location: Los Angeles	bump

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