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I would be looking at the relay before I would blame a crystal for that. Or maybe a tube.

If a crystal is losing its output level the frequency should shift in a noticeable way at the same time. A quick check of the fine-tune knob would reveal this. If it's still on frequency when the sensitivity drops down, the crystal is probably not the culprit.

Simply tapping the side of each receiver tube with a steady signal in the receiver could zero in on a tube that's cutting in and out. A dirty tube socket is all it takes to do this, too. Same deal with the relay. A "thwack" with the back of a finger against the end of the relay nearest the contacts will typically cause a "pop" in the receiver audio, since you are shocking it in the direction the armature normally travels. A tap against the TOP of the relay should never get you any noise, unless a contact is oxidized or worn.

73

<blockquote data-quote="nomadradio" data-source="post: 594173" data-attributes="member: 22">I would be looking at the relay before I would blame a crystal for that. Or maybe a tube. If a crystal is losing its output level the frequency should shift in a noticeable way at the same time. A quick check of the fine-tune knob would reveal this. If it&#039;s still on frequency when the sensitivity drops down, the crystal is probably not the culprit. Simply tapping the side of each receiver tube with a steady signal in the receiver could zero in on a tube that&#039;s cutting in and out. A dirty tube socket is all it takes to do this, too. Same deal with the relay. A &quot;thwack&quot; with the back of a finger against the end of the relay nearest the contacts will typically cause a &quot;pop&quot; in the receiver audio, since you are shocking it in the direction the armature normally travels. A tap against the TOP of the relay should never get you any noise, unless a contact is oxidized or worn. 73</blockquote>

[QUOTE="nomadradio, post: 594173, member: 22"] I would be looking at the relay before I would blame a crystal for that. Or maybe a tube. If a crystal is losing its output level the frequency should shift in a noticeable way at the same time. A quick check of the fine-tune knob would reveal this. If it's still on frequency when the sensitivity drops down, the crystal is probably not the culprit. Simply tapping the side of each receiver tube with a steady signal in the receiver could zero in on a tube that's cutting in and out. A dirty tube socket is all it takes to do this, too. Same deal with the relay. A "thwack" with the back of a finger against the end of the relay nearest the contacts will typically cause a "pop" in the receiver audio, since you are shocking it in the direction the armature normally travels. A tap against the TOP of the relay should never get you any noise, unless a contact is oxidized or worn. 73 [/QUOTE]

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