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In Reply to: RE: GE 6L6GC Heat Issue posted by cabelok on March 22, 2016 at 16:20:34
I am glad to be of some help. Be sure to have all your tubes tested just to make sure. The small signal tubes don't have to be tested for current just a standard emissions test is fine. I hope your amp is ok and that it is just a tube problem. tc&br, Dak
Edits: 03/22/16Follow Ups:
I'll check tonite with tubes I know to be okay. Thanks for advice re pre tubes. Do you think the connectors need to be tweaked regularly so they contact the pins with a consistent force? I will check that also. When I switched the tubes this afternoon(L to R)they run much cooler but warmer than I like (after an hour). At least both sides (feel by hand above the OPT) are the same now.
Yes! Making sure the socket contacts are clean/tight and the tube pins clean is important. The temperature improvement may indeed be due to inserting/reinsert in and switching sockets as a cleaning motion in itself.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
There was a socket that was a little too open on the side I was have trouble with, tweaked it and cleaned with pipe cleaner dipped in De Oxit. All is well. I have to get into the habit of checking them. When one considers how much some of us spend on tubes and the archaic design of the contact socket I wonder... High end connectors for other applications usually have a stainless collar which acts as a spring to ensure the socket parameters stay the same.
...some old time transmitter grade sockets did indeed have "helper" springs around pin contacts to assure a tight grip at all times. Pic is closeup of contact of an old Johnson 7 pin ceramic socket intended for tubes like 829 or 6C33. Spring wraps around the outside of actual contact.
I'll order myself a socket and check if it feasible to make up something. I was thinking more along the lines of a key ring type of spring (easy to put on)- not too tight and not too soft, just right... I'm sure many have chased problems without thinking of this.
I try cleaning and tightening everything once a year. Including controls, cables, pretty much anthing that makes contact. Even wall outlets. Admittedly it takes a long time and I am getting lazier. Still haven't completed my latest annual clean which I started months ago.
Yes it would be nice if things could be more stable. Sometimes I feel like just soldering everything together and be done with it!!!!
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
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