TS-830s, resistors in the cathode circuit

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eHam.net Forum : Elmers : TS-830s, resistors in the cathode circuit

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TS-830s, resistors in the cathode circuit	Reply
by K2OOG on October 28, 2009	Mail this to a friend!
question for TS-830s Elmers, What is the function of the 4 20 ohm resistors in the cathode circuit of the 830s final tubes. Are they cathode bias resistors? If one or more is burnt out in parallel, this would raise the resistance of the set, changing the bias of the cathode? Are these resistors protective resistors, and how would that work? If some were burnt out, but not all, how would that affect the meter readings?

RE: TS-830s, resistors in the cathode circuit	Reply
by WT0A on October 28, 2009	Mail this to a friend!
Dang, David, I thought you were a real ham and knew those things. Sry, couldnt resist Glen WT0A

RE: TS-830s, resistors in the cathode circuit	Reply
by K4DPK on October 28, 2009	Mail this to a friend!
K2OOG / KI6MUL Where are you going with this post? If it's like your others, it's nothing but a trolling expedition. You seem to have learned a few catch phrases and just can't wait to got on here and impress everyone. I'm not impressed. Why don't you get a Bill Orr handbook? Phil C. Sr. k4dpk

RE: TS-830s, resistors in the cathode circuit	Reply
by N2EY on October 28, 2009	Mail this to a friend!
K2OOG: "What is the function of the 4 20 ohm resistors in the cathode circuit of the 830s final tubes." Metering. K2OOG: "Are they cathode bias resistors?" No. K2OOG: "If one or more is burnt out in parallel, this would raise the resistance of the set, changing the bias of the cathode?" Irrelevant. They are not cathode bias resistors. K2OOG: "Are these resistors protective resistors," No. K2OOG: "and how would that work?" They are not protective resistors. K2OOG: "If some were burnt out, but not all, how would that affect the meter readings?" What do you think? Are the ones in the TS-830S you are working on burnt out? Have you measured the resistance of the four paralleled 20 ohm resistors? 73 de Jim, N2EY

RE: TS-830s, resistors in the cathode circuit	Reply
by AC5UP on October 28, 2009	Mail this to a friend!
Resistance Is Futile!

RE: TS-830s, resistors in the cathode circuit	Reply
by KA5N on October 28, 2009	Mail this to a friend!
More wasted bandwidth. Allen

RE: TS-830s, resistors in the cathode circuit	Reply
by KE4DRN on October 28, 2009	Mail this to a friend!
hi, If the radio is not tuned properly or overdriven, the resistors will be sacrificed (burned up) and will protect the expensive transformer as well as the plate chokes. 73 james

RE: TS-830s, resistors in the cathode circuit	Reply
by K2OOG on October 28, 2009	Mail this to a friend!
thank you James, for that info. 73 David

RE: TS-830s, resistors in the cathode circuit	Reply
by K2OOG on October 28, 2009	Mail this to a friend!
James, thank you for answering my enquiry on the burnt out resistors in the cathode circuits of the finals in the 830s. I do not have the schematics handy. I am trying to figure out how the 830s works in case of operator error. I am copying your posting below for reference. "If the radio is not tuned properly or overdriven, the resistors will be sacrificed (burned up) and will protect the expensive transformer as well as the plate chokes." I just would like to clarify. you are saying that if there is operator error on the 830s, and it is not tuned properly or it is overdriven, the fuse may not necessarily protect the circuits and components of the rig. These resistors may be burned up to protect the expensive transformer as well as the plate chokes. My confusion here is that some hams have posted in reply that these resistors are not protective resistors, that they are used for metering. You are saying that they are protective resistors. Are they used for both metering and protection of the transformer and the chokes, or are they just for protection, in case of operator error? Thank you for your help. 73 David

RE: TS-830s, resistors in the cathode circuit	Reply
by K2OOG on October 28, 2009	Mail this to a friend!
James, I do not have the rig or the schematic in front of me. I am enquiring as to what would happen if there is operator error and he detunes the finals of the 830s. The fuse may blow, but that may not protect those resistors, which may also burn out? I suppose the fuse would blow if the resistors were burnt out. The operator sees that he did something wrong, changes the fuse. How does he know whether he blew the resistors as well? That he needs to bring the rig to the bench to replace those resistors? What would the symptoms be of burnt out resistors? Since the fuse did not protect those resistors, is it possible that there could be other components damaged in addition to those resistors, as a result of his operator error in tuning the finals?

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