X250 stay cool! Normal?

TADonly · 9th May 2006, 02:34 PM

I purchased an used X250 to drive my TAD Horn speaker with impedence 8 ohm and sensitivity 103db one month ago. I found that the X250 stay cool even after running for 8 hours. The heat sinks temp. rise to less than 10 degreeas C above room temp.
Any simple way to check whether I should send my X250 back to local dealer for bias-checking?

Nelson Pass · 9th May 2006, 04:39 PM

The amplifier should run about 25 deg C. above ambient.

More practically, the heat sink temperature should be on the
borderline so that you can put your hand on them for about 5
seconds.

TADonly · 9th May 2006, 04:55 PM

Dear Mr. PASS:
Thanks for your immediate reply!!
After Non-stop running for 8 hours, the heat sinks temp. of X250 is really low, just like the power is not ON!! The VU meter stay at 10 o'clock all the time!
Would you mind telling me whether X-series Amp should receive regular BIAS check-up ?

Nelson Pass · 9th May 2006, 08:26 PM

No, a regular bias check up is not required, but all our amplifiers
are biased for approximately the same temperature, so anyone
can apply the 5 second temperature test to decide whether
their amp might need to be looked at.

Circuits occasionally fail, and we do run across pieces in the
field that have had their bias potentiometers tweaked by users.

9th May 2006, 02:34 PM	#1
TADonly diyAudio Member Join Date: Mar 2005 Location: Taipei	X250 stay cool! Normal? I purchased an used X250 to drive my TAD Horn speaker with impedence 8 ohm and sensitivity 103db one month ago. I found that the X250 stay cool even after running for 8 hours. The heat sinks temp. rise to less than 10 degreeas C above room temp. Any simple way to check whether I should send my X250 back to local dealer for bias-checking? __________________ My TAD Horn Cinema

9th May 2006, 04:55 PM	#3
TADonly diyAudio Member Join Date: Mar 2005 Location: Taipei	Dear Mr. PASS: Thanks for your immediate reply!! After Non-stop running for 8 hours, the heat sinks temp. of X250 is really low, just like the power is not ON!! The VU meter stay at 10 o'clock all the time! Would you mind telling me whether X-series Amp should receive regular BIAS check-up ? __________________ My TAD Horn Cinema

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
stay-on switch	CommanderZero	Parts	0	17th June 2006 09:51 AM
help me stay alive (mains)	travis	Everything Else	12	20th June 2003 08:54 AM
Dr. Bob says: Don't be a fool stay in school	Fred Dieckmann	Everything Else	1	1st April 2003 10:31 PM
building amp every one should stay tuned	jleaman	Everything Else	0	13th April 2001 05:45 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


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

9th May 2006, 04:39 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	The amplifier should run about 25 deg C. above ambient. More practically, the heat sink temperature should be on the borderline so that you can put your hand on them for about 5 seconds.

9th May 2006, 08:26 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	No, a regular bias check up is not required, but all our amplifiers are biased for approximately the same temperature, so anyone can apply the 5 second temperature test to decide whether their amp might need to be looked at. Circuits occasionally fail, and we do run across pieces in the field that have had their bias potentiometers tweaked by users.

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