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34555Re: [midatlanticretro] trouble finding a few parts

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  • Dave McGuire
    Feb 24, 2014
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      Ah ok, that's just a load capacitor for a crystal. 22pF is fine there.

      Nearly all ceramic disk capacitors have a tolerance of +/- 20% anyway,
      and 22pF is well within that range. Just use a 22pF.

      -Dave

      On 02/24/2014 06:30 PM, B Degnan wrote:
      >
      >
      > You can find 22's but not pF20's as easily.
      >
      > http://tubularelectronics.com/Heath_Manual_Collection/Heath_Manuals_E-F/ET-3400/
      >
      > ...click on the mod kit link. page 2
      > Bill
      >
      >
      > -----Original Message-----
      > From: Dave McGuire <Mcguire@...>
      > To: midatlanticretro <midatlanticretro@yahoogroups.com>
      > Sent: Mon, Feb 24, 2014 4:52 pm
      > Subject: Re: [midatlanticretro] trouble finding a few parts
      >
      > On 02/24/2014 04:48 PM, B Degnan wrote:
      >> Anyone have for sale, or can point me to a few items?
      >>
      >> 20 pF ceramic capacitor
      >
      > These should be all over the place. I have thousands of 'em in
      > surface-mount; I'll see if I've got one in through-hole. If so, I'll
      > mail you one.
      >
      >> GD510 diode. (is there a substitute?)
      >
      > Now this is a different matter. That's a pretty well-known diode and
      > it's tough to find. It's a germanium diode, and the circuit *may*
      > depend on some of its characteristics. You might get by with something
      > like a 1N34A or a 1N60. Can you send me the relevant part of the schematic?
      >
      >> I am working to install the Heathkit ETA-3400 expansion unit to a ET3400
      >> Trainer. To do this they say one must bump up the processing speed to
      >> 4mhz, more RAM, etc. by adding a few modifications to the main unit.
      >
      > Cool!
      >
      > -Dave
      >
      > --
      > Dave McGuire, AK4HZ
      > New Kensington, PA


      --
      Dave McGuire, AK4HZ
      New Kensington, PA
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