I have quantity four wire-ended tubes of russian origin. As far as I can tell, converted from the cyrillic, the type number is 6J10B-V.
Now, using google, I can find data for the 6J10B pentode, but the pin layout is completely different to mine.
The 6J10B has 7 wire leads arranged in a straight line. My 6J10B-V look very much like a half-size B7G arrangement ie 7 leads in a small horse-shoe type pattern. With a little experimentation, I've found the heaters -- easy ! -- but trying to look through the highly reflective shaped glass base to try and observe the internal connections is difficult. I suppose as a last resort I could sacrifice one and cut it open for investigation.
Anyone know where i might find the base diagram, or aware of any method of testing an 'unknown' tube without risk of damage ?
regards..
Now, using google, I can find data for the 6J10B pentode, but the pin layout is completely different to mine.
The 6J10B has 7 wire leads arranged in a straight line. My 6J10B-V look very much like a half-size B7G arrangement ie 7 leads in a small horse-shoe type pattern. With a little experimentation, I've found the heaters -- easy ! -- but trying to look through the highly reflective shaped glass base to try and observe the internal connections is difficult. I suppose as a last resort I could sacrifice one and cut it open for investigation.
Anyone know where i might find the base diagram, or aware of any method of testing an 'unknown' tube without risk of damage ?
regards..