[ARC5] RBB Receiver Question

[David Stinson]

Leave the filament off.  Power the B+ busses and monitor the current.

I don’t remember what the “static, no filament” current should be

on the RBB/RBC, but a look at the diagram should allow you to 

figure it.  For example- A refurbed TCS receiver with “good” caps

should draw a steady 15 mA or there abouts.  Leave it like that for

several hours.  If nothing obvious, turn off the B+ and put your finger

on each cap.  If one is warm or hot, it’s leaking.  

This won’t find open caps, but it will find the leakers.  Howling

IFs, low audio gain, etc. will point to open caps, but this has helped

me find leakers in a short time.

GL OM DE Dave AB5S

 

 

From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Mark K3MSB
Sent: Thursday, March 07, 2019 7:48 PM
To: List Milsurplus; ARC5
Subject: Re: [ARC5] RBB Receiver Question

 

, 

Thanks for the comments guys.     The context was I'm not going to worry about replacing them prior to power up.    Performance and tube voltage checks may indicate that replacement of some is necessary.

 

I have an RBB-6 and RBC-5 along with an RBC-2.    Two need cases.   A Case.... a case...  my kingdom for a case.....

 

73 Mark K3MSB

 

 

 

On Thu, Mar 7, 2019 at 7:43 PM Mark K3MSB <mark.k3msb at gmail.com> wrote:

I am almost ready to apply power to my RBB receiver.

 

>From "NAVSHIPS 91469 Radio Receivers RBB-5, 6 and RBC-5, 6 (1952)",  quite a few of the capacitors are listed as paper dielectric,  castor oil filled.    These are C341 through C-352 on pages 8-11 and 8-12.

 

I'm almost positive these are NOT of the wax paper variety,  but rather the typical oil-filled caps -- so I do not have to worry about replacing them.

 

Just want to be sure....

 

Thanks

 

Mark K3MSB

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