What's the metal cap on top of CX301A tube for ?
Recently acquired a vintage 1927 A****er-Kent Model 33 TRF radio.
It has six identical CX301A tubes with one exception: Tube#4, which I believe to be the final tube of the TRF section (input to the two AF tubes), has a heavy chrome cap over the top of it. This cap is supported by a couple felt pads between the cap and the top of the tube. There appears to be no provision to ground this to the chassis (and use as a shield). Was/is there a function of this cap, or was it just a cosmetic thing ? Did all the tubes originaly have these caps ? PS: Why does the name "A****er" appear with stars between it ? (Word Police: Please fix the censor pgm to allow the A-K name, there's nothing vulgar about it.) |
What's the metal cap on top of CX301A tube for ?
It is to dampen microphonics caused by physical vibration. Usually used
on the detector tube. -Bill xcalibur wrote: Recently acquired a vintage 1927 A****er-Kent Model 33 TRF radio. It has six identical CX301A tubes with one exception: Tube#4, which I believe to be the final tube of the TRF section (input to the two AF tubes), has a heavy chrome cap over the top of it. This cap is supported by a couple felt pads between the cap and the top of the tube. There appears to be no provision to ground this to the chassis (and use as a shield). Was/is there a function of this cap, or was it just a cosmetic thing ? Did all the tubes originaly have these caps ? PS: Why does the name "A****er" appear with stars between it ? (Word Police: Please fix the censor pgm to allow the A-K name, there's nothing vulgar about it.) |
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