[GreenKeys] Tape Reader Power Resistor

[Troy Peterson]

Bingo! Nice find! It's not identical, but it's pretty close and would certainly do the job... As usual, shipping from the US would cost 3x the price of the actual part... and no, we do not have RC Cola over here in the UK but I'm originally from Canada actually and we do have RC in Canada ;)

 

Cheers,
 Troy
 

 
On 09/06/2022 14:12, Joe Duszyński wrote:
 
 
This one is Marsland not Ohmite (like Pepsi and Coke)  ;-)  I would have said RC but I don't ever remember seeing RC Cola in the UK.
 
 https://www.ebay.com/itm/144438952816?hash=item21a13b8370:g:nZkAAOSwj8diHhcw
 
 
 
 
On Thu, Jun 9, 2022 at 8:24 AM Ethan Blanton via GreenKeys <greenkeys at mailman.qth.net> wrote:
 
 Troy Peterson via GreenKeys wrote:
 > Does anyone know where I can find a replacement? I did a
 > cursory search of my usual (UK) component suppliers and 850 ohm
 > doesn't even seem to be a common value, let alone available in high
 > power. I'm not sure what the power rating of this resistor is, or
 > really even what kind of resistor it is...
 
 According to the wiring diagram, that 183081 printed on it is the
 Teletype part number.  I would ask Paul at RTTY Electronics
 (mr_rtty at pacbell.net <mailto:mr_rtty at pacbell.net> , he's on this list) if he has that part number,
 since you say you'd like things to remain original.
 
 Keep in mind tha thet wires don't have to carry a large current if
 they are carrying a large voltage!  Many current loop devices in
 Teletype circuits may drop a small number of mA over a large voltage,
 which is a significant amount of power.  I don't actually know what
 the valid range of voltages for a 20 mA current loop is (I'd be
 interested to know, in fact), but for a 60 mA current loop it's quite
 likely to drop 60 mA at 120 V or more, which is over 7 watts -- but
 can be easily carried on 30 gauge wire (or even smaller!).
 
 I doubt the precise resistance is critical here, although a different
 resistance may entail (for example) adjustments to the current source.
 It looks like you need to chase down the schematic for the board
 that's on (the wiring diagram I checked just shows the resistor wired
 to "Board Assembly Reader Power Pack", part 183087) and see what it's
 doing.  Wire wound resistors are often relatively precise, so I could
 be wrong.
 
 Ethan
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