Video inputs Tube TV

[ARC Tech-109]

Thanks. I have a small EDM-Pabst whisper fan running on the bottom pushing a draft up thru the chassis and the other holes are covered with cardboard, it's strong enough to feel coming out of the cabinet back and the internal temp is down a good 20F according to my Fluke type-k thermometer.

I do have a good supply of 6LQ6 sweepers plus a number of the 6LF6 and 6LB6 that would only require a socket and screen resistor change if needed. The bigger problem I've been having is with gassy damper tubes, two have failed recently with one taking the primary fuse out. Most of my used tube stock goes back to the 1980's but the most recent 6DW4 was a NOS pulled from the carton and dated 1977... new when I was in the 3rd grade. We have a big surplus store called AxMan in St. Paul that has a good stock of NOS TV types for a couple bucks each so I'm going to grab a handful of those and the 6GH8s. They even have NOS 6CW4 and 6DS4 Nuvisters if anyone is interested, I'm not looking to make a buck just cover the purchase and postage and I'm open to trades.

New thermal issue has cropped up, takes a few minutes for the horizontal to drop down in frequency enough for HV and sweep, I suspect one of the "new" resistors is bad but it's not running the horiz output in full conduction from a lack of drive. Other issue is the color killer seems to also have a thermal problem killing the chroma until things warm then it returns to full saturation, guess I need to invest in a can of R-152 known as keyboard duster.

It's been quite a journey and honestly I didn't think it would still be going to this day, a one owner set from 1970 still in the family? Might just outlive me.