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The chances that both driver/final have failed are almost nil. Usually one or the other; but almost never both. So your testing method/results just concludes that a high probability that your results cannot be correct. Might want to review transistor testing if you plan on working on radios, as this is an important step to conquer.

When I test transistors with a DVM, i just used the diode test because it shows if the gate has been shorted or is still conducting one way. Apart from using a DVM, using a dedicated, cheap tester just makes the work time just go so much faster and conclusive when needing to test several. You might want to get one of those cheap testers from a US source if you are getting into this, as it helps immensely - IMO. But knowing how to use the DVM is also invaluable.

The 2166 are used as a driver and the 2312 are used as finals.

You cannot use the 2078 in a SSB radio . . .

EDIT:
Check the transistors you first replaced.

<blockquote data-quote="Robb" data-source="post: 596481" data-attributes="member: 8446">The chances that both driver/final have failed are almost nil.&nbsp; Usually one or the other; but almost never both.&nbsp; So your testing method/results just concludes that a high probability that your results cannot be correct.&nbsp; Might want to review transistor testing if you plan on working on radios, as this is an important step to conquer.When I test transistors with a DVM, i just used the diode test because it shows if the gate has been shorted or is still conducting one way. Apart from using a DVM, using a dedicated, cheap tester just makes the work time just go so much faster and conclusive when needing to test several.&nbsp; You might want to get one of those cheap testers from a US source if you are getting into this, as it helps immensely - IMO.&nbsp; But knowing how to use the DVM is also invaluable.The 2166 are used as a driver and the 2312 are used as finals.You cannot use the 2078 in a SSB radio . . .EDIT:Check the transistors you first replaced.</blockquote>

[QUOTE="Robb, post: 596481, member: 8446"] The chances that both driver/final have failed are almost nil. Usually one or the other; but almost never both. So your testing method/results just concludes that a high probability that your results cannot be correct. Might want to review transistor testing if you plan on working on radios, as this is an important step to conquer. When I test transistors with a DVM, i just used the diode test because it shows if the gate has been shorted or is still conducting one way. Apart from using a DVM, using a dedicated, cheap tester just makes the work time just go so much faster and conclusive when needing to test several. You might want to get one of those cheap testers from a US source if you are getting into this, as it helps immensely - IMO. But knowing how to use the DVM is also invaluable. The 2166 are used as a driver and the 2312 are used as finals. You cannot use the 2078 in a SSB radio . . . EDIT: Check the transistors you first replaced. [/QUOTE]

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