using 12AU7 on 34

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using 12AU7 on 34

Mondial
Phorum Expert

Posts: 1,114
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Joined: Feb 2013
City: Irvington, NY

#14

06-30-2013, 10:13 PM

No none of those tubes are compatible. The type 19 is a Class B output tube which operates with zero grid bias. All the other tubes you mentioned need a negative grid bias to prevent the tube from drawing excessive plate current.

My advice would be to wait for the proper type 19 tube to arrive, as it is not easily substituted. In the meantime you might start checking some other components with an ohmmeter for problems like off tolerance resistors and open antenna or RF coils

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Messages In This Thread

using 12AU7 on 34 - by marty - 06-30-2013, 09:46 AM

RE: using 12AU7 on 34 - by codefox1 - 06-30-2013, 10:12 AM

RE: using 12AU7 on 34 - by marty - 06-30-2013, 03:29 PM

RE: using 12AU7 on 34 - by codefox1 - 06-30-2013, 03:45 PM

RE: using 12AU7 on 34 - by morzh - 06-30-2013, 03:46 PM

RE: using 12AU7 on 34 - by marty - 06-30-2013, 03:57 PM

RE: using 12AU7 on 34 - by morzh - 06-30-2013, 04:08 PM

RE: using 12AU7 on 34 - by marty - 06-30-2013, 04:46 PM

RE: using 12AU7 on 34 - by morzh - 06-30-2013, 06:00 PM

RE: using 12AU7 on 34 - by marty - 06-30-2013, 09:03 PM

RE: using 12AU7 on 34 - by morzh - 06-30-2013, 09:17 PM

RE: using 12AU7 on 34 - by Mondial - 06-30-2013, 09:28 PM

RE: using 12AU7 on 34 - by marty - 06-30-2013, 09:51 PM

RE: using 12AU7 on 34 - by Mondial - 06-30-2013, 10:13 PM

RE: using 12AU7 on 34 - by marty - 06-30-2013, 10:39 PM

RE: using 12AU7 on 34 - by morzh - 06-30-2013, 10:53 PM

RE: using 12AU7 on 34 - by marty - 07-06-2013, 09:54 AM

RE: using 12AU7 on 34 - by codefox1 - 07-06-2013, 12:04 PM

RE: using 12AU7 on 34 - by marty - 07-06-2013, 04:47 PM

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