[ARC5] BC-230 first run

[Ron Barlow]

Hi Neil, I believe that the capacitor should be connected in parallel with the 5 ohm resistor, instead of in series with it, in order to achieve the antenna requirements stated in the manual.                             73 & GL de Ron
   

 On Sunday, March 27, 2016 6:39 AM, AKLDGUY . <neilb0627 at gmail.com> wrote:
 

 Need some suggestions because I may have overlooked something.

BC-AO-230 with 4 x 6AQ5 in adapter sockets with 12.8 VDC on the
heater line and 320 VDC plate supply. All 4 heaters light up and look
normal. To protect the modulator and final tubes in case the VFO
failed to start or bias wasn't developed, I connected 5 x 10V batteries
in series to the bias line (battery -ve to junction of R100 and R104
via a diode).

I heard the VFO on a monitor receiver, so disconnected the batteries
and sure enough, about 70 V bias was present at the same junction
so the VFO was operating and no tube showed any sign of distress.
Freq was reasonably stable and the note was good. Freq: 6200 KHz;
6200-7700 KHz coil set inserted. All coil windings have continuity.

No matter what I did, I could get no output from the final into a dummy
load of 5 x 1 ohm carbon resistors in series. No indication on the RF
ammeter, nothing but a steady 25mA final plate current with a meter
plugged into the meter jack. No sign of dip when tuning the final tank
capacitor through its range. The coil wiper contact is good and several
settings don't work.

Mike (ex-taxi radio) not yet connected but its PTT switch operates a
12V relay to switch on the B+ to the set.

Have I overlooked something?

73 de Neil ZL1ANM
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