• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Tubing Testing...how are these numbers?

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Hi,

I'm looking to buy a pair of siemen's 7308s, and I've found a good seller who has tested the tubes. Here are the results:


Quote
Tube1 - A1 = 18,0/13,0 A2 = 18,0/13,0

Tube2 - A1 = 18,0/13,0 A2 = 18,0/13,0

Both tubes have A6 9C stamped on small plates inside. If you know how to dechifer the siemens codes please share that information with me.


For a 7308 is this good/bad? It will be used in an preamp.

I can guess by the numbers that these tubes are obviously matched, but is this 18/13 good. (frankly, what does it mean)

Also, I read abou it somewhere else, but I believe A6 means it was the 6th production, I've heard the 4th was the best, but for the price, I think these will be fine.

Thanks,
West
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.