Hey old friends, I have a couple dozen pulls from a 1960/1 Conn organ. Date codes on the tubes are 1960. They're dusty of course. I don't want to clean them out of concern for damaging the printing. I did one with a Qtip so I can take pictures and I knocked the 4 off the mfg code (274).
It's commonly accepted (and my experience) that tubes used in this application operate like new - this was a home use organ, and when used in a tone generating circuit they are used well within their limits.
Tested in a high gain guitar amp for noise and weirdness. These are great tubes.
$10 each. $7.50 Priority Mail to US no matter how many you buy. Paypal or Venmo.
Outside US, please pm to figure things out.