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This is a list of cards with known errors. If you find any errors not listed, please inform me.

4CE5
6KM6-2
6MD8-1
6MD8-2
10LD13-2
10LD13-2
11FY7-1
11FY7-2
17JF6-2
17JT6-2
20EQ7-2
58HE7-1
58HE7-2
58HE7-3
83V
KT88

All of the cards listed above have either wrong filament voltages or wrong pinouts. These errors are easy to spot. It stands to reason that other errors exist which are not so easy to spot, such as proper meter sensitivity. Please report any suspected errors.

 

The following tubes all have one or more 12AX7 triodes in the envelope. Hickok used the published operating point of +100V plate and -1.0V grid bias for these tubes. The problem is the manufacturers started insuring their tubes adhered only to the other published operating point, which is +250V plate and -2.0V grid bias. As a result many good 12AX7ís test low on the Cardmatic.

 

As of database version 1.05, the triode section(s) of following tubes have all been modified to use the latter operating point:

 

3AV6

4AV6

6AV6

6AX7

6BK6

6EU7

6C10

6DR4

6KX8

6Q11

12AV6

12AX7

12BK6

12DW7

20EZ7

26BK6

5751

6057

7025

7058

7247

7729

EBC91

ECC83

 



03-14-2016