| Author: | Nick Zannis (registered user: 471 posts ) |
| Date: | Wed, Jun 20th, 2012 @ 07:36 ( . ) |
I put in and bias a fresh set of 6v6 at about 23mA on each cathode with a plate voltage around 420 VDC. Does the tube's resistance increase or decrease with age? Would the bias current decrease from what you originally wet it to? Reason for question is I have three 6v6 tubes that I mixed up. One pair is matched, the remaining tube was used briefly in class A. Went to put a pair in an amp after a mod and noticed one tube was 15mA higher than the other. Swapped the higher current tube with another 6v6 and they matched. Appreciate any input. |
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