Anyone good with the mullard date codes?
For the last 6 months I've been trying to organize my tubes so it's easy to locate what I'm looking for. I thought I'd gotten all of my better tubes organized and that all the boxes of tubes left to go through in storage were just the common ones. When I boxed these, which was at least 10-15 years ago I guess I didn't care about Mullard 12AX7's or I would have put them in a different box. I found a few of these mixed in with common tubes. A couple were made for Eico. The Eico tubes have 161 on top and B2D2 on the bottom. The others have MC1 on top and B7A on the bottom. Wondering if anyone can date these.
I've been printing out pages with date codes for various brands of tubes but I have gotten conflicting and sometimes confusing results on the web for Mullard tubes so I thought I'd ask.
For the last 6 months I've been trying to organize my tubes so it's easy to locate what I'm looking for. I thought I'd gotten all of my better tubes organized and that all the boxes of tubes left to go through in storage were just the common ones. When I boxed these, which was at least 10-15 years ago I guess I didn't care about Mullard 12AX7's or I would have put them in a different box. I found a few of these mixed in with common tubes. A couple were made for Eico. The Eico tubes have 161 on top and B2D2 on the bottom. The others have MC1 on top and B7A on the bottom. Wondering if anyone can date these.
I've been printing out pages with date codes for various brands of tubes but I have gotten conflicting and sometimes confusing results on the web for Mullard tubes so I thought I'd ask.
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