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Thank you for this. I am starting to understand how it each piece is

Thank you for this ! I see it really will come down to the love for the radio and is the time is worth it. Starting to understand why there are not many left as the cheaper price for a new radio and the time on a bench starts to add up !

The howl only happens with tone (possibly overloading tone to a howl, but not with outside signals. Just distorted. In checking these diodes, I see that D1 and D2 here are noted as those MI301 type but rest are in the frontend 1N4148 eqiv. as you stated. I do have low RX pushing a tone to it but RX is great on outside - so I could have multiple issues going on. Did the cold solder checks and such for good measure.

Would it be beneficial go back to the diodes in the AGC and verify those diodes first ? (someone told me they were D24,D25,D23,D13) with DMM and work forward to the D2/D1 stage as possible separate but together issues ? Overload is constant between AM/SSB, at least.

Should the diode testing be done in circuit with or without power applied? I know that I saw opinions on the use of diode check mode vs. pulling and using both ohm setting and diode test for shorts and if the diodes are in parallel in opposite directions in circuit could give a false reading. What would be the best way to check? Thanks again, Andy. I have some things to check !

<blockquote data-quote="Spyder280" data-source="post: 782690" data-attributes="member: 57893">Thank you for this. I am starting to understand how it each piece is Thank you for this ! I see it really will come down to the love for the radio and is the&nbsp; time is worth it.&nbsp; &nbsp; Starting to understand why there are not many left as the cheaper price for a new radio and the time on a bench starts to add up !&nbsp; &nbsp; The howl only happens with tone (possibly overloading tone to a howl, but not with outside signals. Just distorted. In checking these diodes, I see that D1 and D2 here are noted as those MI301 type but rest are in the frontend 1N4148 eqiv.&nbsp; as you stated.&nbsp;&nbsp; I do have low RX&nbsp; pushing a tone to it but RX is great on outside - so I could have multiple issues going on. Did the cold solder checks and such for good measure. Would it be beneficial go back to the diodes in the AGC and verify those diodes first ?&nbsp; (someone told me they were D24,D25,D23,D13)&nbsp; with DMM and work forward to the D2/D1 stage as possible separate but together issues ?&nbsp; Overload is constant between AM/SSB, at least.&nbsp; Should the diode testing be done in circuit with or without power applied? I know that&nbsp; I saw opinions on&nbsp; the use of diode check mode vs. pulling and using both ohm setting and diode test for shorts and if the diodes are in parallel in opposite directions in circuit could give a false reading.&nbsp;&nbsp; What would be the best way to check?&nbsp; Thanks again, Andy.&nbsp; I have some things to check !</blockquote>

[QUOTE="Spyder280, post: 782690, member: 57893"] Thank you for this. I am starting to understand how it each piece is Thank you for this ! I see it really will come down to the love for the radio and is the time is worth it. Starting to understand why there are not many left as the cheaper price for a new radio and the time on a bench starts to add up ! The howl only happens with tone (possibly overloading tone to a howl, but not with outside signals. Just distorted. In checking these diodes, I see that D1 and D2 here are noted as those MI301 type but rest are in the frontend 1N4148 eqiv. as you stated. I do have low RX pushing a tone to it but RX is great on outside - so I could have multiple issues going on. Did the cold solder checks and such for good measure. Would it be beneficial go back to the diodes in the AGC and verify those diodes first ? (someone told me they were D24,D25,D23,D13) with DMM and work forward to the D2/D1 stage as possible separate but together issues ? Overload is constant between AM/SSB, at least. Should the diode testing be done in circuit with or without power applied? I know that I saw opinions on the use of diode check mode vs. pulling and using both ohm setting and diode test for shorts and if the diodes are in parallel in opposite directions in circuit could give a false reading. What would be the best way to check? Thanks again, Andy. I have some things to check ! [/QUOTE]

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