Using contact cleaner in tube sockets

@ sgonzalez33

My ARC VT100mkii which I just got, has a crackling from one of the channels. The tubes are new. When I first installed the tubes, it was fine.

New tubes? Installed and biased by someone who knew what he was doing?

You can’t just swap tubes around in a VT100 mkll. At least not the 6922 tubes.
The 6922 input and driver tubes must be biased. Failure to bias the 6922 tubes properly can damage tubes, blow screen resistors, and or damage circuit boards. Damage to the amp especially if the driver tubes are not biased properly.

Courtesy of Abe Collins
http://mycollins.net/audio/artube1.html

http://www.audioresearch.com/ContentsFiles/VT100%20MKII_BiasAdjust.pdf

Scroll down to bottom of page for schematic wiring diagram/s
http://www.arcdb.ws/VT100/VT100.html

http://www.audioresearch.com/ContentsFiles/VT100II_Manual.pdf

Jim

Biased the 6550cs myself. Didn't know the 6922s needed biasing as well. I was sent the amp and tubes separately. New tubes at that.
I guess I'll be opening a ticket with AR and shipping it to them. Any idea what this might cost me?

Were the 6922 individually numbered showing which tube socket they were to  be plugged into? Look near the base of the tubes for V1 through V8. If marked install tubes per diagram in owner manual.

Power tubes should be marked as well. (They are easy to bias if they are not though)
 
http://www.audioresearch.com/ContentsFiles/VT100II_Manual.pdf

Jim

There's no indication they were purchased from ARC and there are no markings. The 6550cs are Svetlanas and the 6922s are Electro-harmonix.
I will have to start with contacting the seller.