Bottlehead Kits > Crack
Tube Rolling w/Crack
N72826:
--- Quote from: Paul Birkeland on January 30, 2024, 05:43:10 AM --- If you have a Speedball in your Crack, what are the OA and OB voltages on the small board with that tube? That can be used as a bit of a test for whether the 12AU7 is near the end of its life or is relatively fresh.
--- End quote ---
I'm getting 62.4 OA and 75.5 OB
Doc B.:
Try a TungSol 12AU7 for a little more bass weighted sound. Don't buy $50 to $500 tubes until you buy several less expensive 12AU7s of different brands to get a feel for what you want. More educational, more bang for your buck.
N72826:
--- Quote from: Doc B. on January 30, 2024, 06:52:28 AM ---Try a TungSol 12AU7 for a little more bass weighted sound. Don't buy $50 to $500 tubes until you buy several less expensive 12AU7s of different brands to get a feel for what you want. More educational, more bang for your buck.
--- End quote ---
Thanks Doc! That's really solid advice especially for an impulsive buyer like me. ;D I've seen how much you advise against dumping too much money into this hobby just for the sake of it, so I just want to say I really respect your honesty. 8)
Paul Birkeland:
--- Quote from: N72826 on January 30, 2024, 06:32:35 AM ---I'm getting 62.4 OA and 75.5 OB
--- End quote ---
This is a near-new 12AU7.
Tom-s:
--- Quote from: N72826 on January 30, 2024, 05:24:47 AM ---Oh also, my ECC82 is labeled K63 D9R, just noticed that recently as I was swapping the tubes out. Not sure what to make of that but I'm going to look around and determine what I even have because the ebay listing didn't specify the year or anything really. I think 63 means 1963 but I will set aside the speculation lol
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The K63 D9R is a Philips date code.
K6 = ECC82 with 3 being the revision code.
D = The factory code for the Philips factory; Hamburg (Valvo) in this case.
9 should be 1959 but your R is probably a misread B -> feb. R doesn't exist in that years Philips code.
Here's the data to decipher a Philips factory code: https://frank.pocnet.net/other/Philips/PhilipsCodeListAB.pdf
As PB said. Is that the test result with the Valvo in the Crack? That's really good actually.
The best tester at the end of the days is the circuit the tube is used in. If it works, it works.
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