Tubelab SE input tube filament

Evenharmonics · 24th January 2009, 06:48 PM

I took out the input tubes (5842) from my Tubelab SE for maintenance and put them back in. Turned it on and only the right side filament glows. I swapped the tubes but same problem so it's not the tube. Could it be a bad socket? The filament heater voltage comes from one source and splits left and right in this amp but if one side works fine and the other side doesn't, I'm guessing it's the contact problem locally or lack of. Any guesses?
Thanks in advance.

Ty_Bower · 24th January 2009, 08:20 PM

Maybe check for a cold solder joint where the socket is soldered to the board?

Is it the type of socket where you might be able to tighten up the contacts with a dental pick?

Evenharmonics · 24th January 2009, 11:41 PM

I haven't thought of dental pick as a standard electronics equipment but now I can see why it may be useful. I used a toothpick (close enough) and now it works. Time to replace with better socket than those cheapo plastic ones (it's deformed little from the heat).

Thanks.

Ty_Bower · 25th January 2009, 12:10 AM

I used the nine pin "Fender style" sockets from TubeDepot. Ceramic base resists heat, and exposed contacts makes for easy adjustment should the need arise. Plus, they kinda match the style of the octal sockets I used. I've only had the amp running since last summer, but so far the sockets seem to be working just fine.

http://tubedepot.com/sk-9pinpcf.html

24th January 2009, 06:48 PM	#1
Evenharmonics diyAudio Member Join Date: Apr 2007	Tubelab SE input tube filament I took out the input tubes (5842) from my Tubelab SE for maintenance and put them back in. Turned it on and only the right side filament glows. I swapped the tubes but same problem so it's not the tube. Could it be a bad socket? The filament heater voltage comes from one source and splits left and right in this amp but if one side works fine and the other side doesn't, I'm guessing it's the contact problem locally or lack of. Any guesses? Thanks in advance.

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
Weird old power transformers (filament, SS and tube) - $7 each!	pjanda1	Swap Meet	6	29th March 2010 04:17 PM
Standard tube filament voltages and currents	ilimzn	Tubes / Valves	5	4th January 2010 05:53 AM
Input impedance of tubelab simple se	pforeman	Tubes / Valves	1	24th May 2009 12:42 PM
Input impedance of tubelab simple se	pforeman	Full Range	2	24th May 2009 05:10 AM
Question on shared rectifier / signal tube filament windings	bst	Tubes / Valves	2	7th December 2005 10:17 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


	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

24th January 2009, 08:20 PM	#2
Ty_Bower diyAudio Member Join Date: Mar 2007 Location: Newark, DE	Maybe check for a cold solder joint where the socket is soldered to the board? Is it the type of socket where you might be able to tighten up the contacts with a dental pick?

24th January 2009, 11:41 PM	#3
Evenharmonics diyAudio Member Join Date: Apr 2007	I haven't thought of dental pick as a standard electronics equipment but now I can see why it may be useful. I used a toothpick (close enough) and now it works. Time to replace with better socket than those cheapo plastic ones (it's deformed little from the heat). Thanks.

25th January 2009, 12:10 AM	#4
Ty_Bower diyAudio Member Join Date: Mar 2007 Location: Newark, DE	I used the nine pin "Fender style" sockets from TubeDepot. Ceramic base resists heat, and exposed contacts makes for easy adjustment should the need arise. Plus, they kinda match the style of the octal sockets I used. I've only had the amp running since last summer, but so far the sockets seem to be working just fine. http://tubedepot.com/sk-9pinpcf.html