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In Reply to: Eico HF81 shield photo, for T. Willman posted by drlowmu on April 21, 2007 at 20:26:10:
Jeff
I like the way you did that and the ingenuity you used to muster such an appeal to the eyes.Those transformers look brand new but I know they are repainted being every eico amp I have seen almost especially my own has oxidation on the EI type transformers..Good Job!!
Follow Ups:
Michael,NO sir, I did not paint the transformers. The Eico's P.T. in particular was nasty looking. I scrubbed it with a toothbrush, rags, and "Bon Ami" cleanser " No chlorine, Perfume, or Dye......Since 1886.....Hasn't scratched yet". Guess where that Bon Ami is made...Kansas City !!
The magnetic shields on the HF-81 will need to be redone Michael in 10 gauge steel, same exact configuration, because I think Mr. Dave "clip lead" Slagle is correct about materials choice, as usual. Thank you Dave!!
Michael, whenever tubes are too close to iron, including rectifier tubes, the shields HELP in a clearly audible way. And, I have found that rectifier tubes themselves will feed into small signal tubes if they are too close to each other.
Tre', mikeyb, Triode_Kingdom and arend-jan will gladly give us all the scientific explaination, as to "why",.... you see, its all gotta be clearly spelled out in RDH4. :-)
... until Dave S had "questioned" you on your choice of materials, you had presented a solution that in fact was marginal at best in its execution and admitted by yourself to be untested in its current configuration. Your "listening" test being with completely different materials. It makes you think how many other of your presentations and test results are similarly flawed.Oh and don't worry about RDH4. It's all there on pages 784 to 786. I mean, all the stuff you and Dennis have been talking about - layout, screening (which is all your plates are).
I myself have done much experimentation in this regard but I found other materials better suited. I don't doubt you have heard what you report. It just isn't news and is well documented if you care to look for it.
Hi StephenR,Thats cool. In my very first post I mentioned 10 gauge steel as being my favorite in the past. And....I was VERY open in discussing my shortcomings on testing this shielding piece, so people would NOT get the wrong information and impression.
Frankly, I do not seek, or require, your vote of confidence.
I will listen, when I have time, to both materials none the less, each does something different, and needs to be heard for evaluation. Best wishes.
Jeff Medwin
sorry, I somehow missed your clarification post. I got tetchy when you were being sarcastic about a very good reference book where it does explain this sort of thing as it isn't voodoo but good engineering i.e. it is documented and an educated tech type would know where to look. It doesn't help slagging people off that have an education. It also doesn't stop people from experimenting; another claim you keep making.
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