[ARC5] SCR-183: Clean, Lube and Tips

[J Mcvey]

 You will need all 4 tubes installed , even to run as a MOPA , because the transmit tube filaments are both in series with the modulator tubes.That is, Unless you are doing the "bypass heater  wiring with 6.3 vac "  and just grounding the cathodes with  the original filament  pins as previously discussed? The cathodes and heaters are isolated in this configuration, but requires added wiring to the heaters .


    On Thursday, November 25, 2021, 11:14:28 PM EST, David Stinson <arc5 at ix.netcom.com> wrote:  
 
  
Soon as I can get it done, I'll include information specific to 
 using 5763.  You'll need to make bias changes and the 9-pin 
 sockets will need to be trimmed of the excess metal 
 outside of the mounting nuts, else they won't fit through
 the "holding rings" used for the base of the original tubes.
 
 Also- I put a .01 uFd cap across the filament pins so 
 that both ends- the one to which the cathode was
 connected and the other one- are at the same RF potential.
 We need to discuss this issue of the cathodes of the tubes
 being 6, 12 or 24 VDC above ground because of the 
 5763/6AQ5 cathodes being connected to one filament pin.
 That should be a bias issue, but we'll talk about that
 after I've got some more data compiled.
 
 73 Dave AB5S
 
 On 11/25/2021 6:14 PM, Steve WD8DAS via ARC5 wrote:
  
 
 
  Dave, you make a good point about adding new capacitors near the circuit connection point instead of physically replacing the old capacitors.  I'm impressed how much space there is inside my BC-430.  
   
 
   I've received the 4-pin to 9-pin adapters I ordered from Ben, so I'll shortly be wiring those up to put 5763s in place of the missing tubes.  My thought is to do the MO and PA first and get it running as a CW rig before worrying about the modulator stage.
  
   
     Steve WD8DAS     
 


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