[Milsurplus] RBZ vs RBZ Special?

[WA5CAB at cs.com]

I don't have any modification details but some years before he died, Tony 
Grogan told me that the modifications were made by OSS/MI5 and the modified 
sets were dropped to POW's near the end of the War.  He thought that the dial 
was re-marked in "reddish", which I took to be either red or orange.  
Manual supposed to be TM 11-895, which I have never seen.

In a message dated 09/16/2013 15:37:50 PM Central Daylight Time, 
gtsrmike at yahoo.com writes: 
> I did think it sounded a bit strange when I first read it. If one could 
> manage to find 7mc of adjustment in a trimmer then those must be some 
> exceptionally touchy trimmer caps.
> 
> - Mike
> 
> 
> --------------------------------------------
> On Mon, 9/16/13, Al Klase <ark at ar88.net> wrote:
> 
> Subject: Re: [Milsurplus] RBZ vs RBZ Special?
> To: "Mike T" <gtsrmike at yahoo.com>
> Date: Monday, September 16, 2013, 3:29 PM
> 
> Mike,
> 
> That's a big step up in frequency.  I would have never
> expected the trimmers to take care of it.  I think
> you'd have to rewind the coils, rather than just pruning
> them, as they need to be spread along a particular portion
> of the form to tune properly.
> 
> Take care with the radium pain to the dial.  Like maybe
> immobilize it with clear nail polish.  Mine's pretty
> hot.
> 
> Al
> 
> On 9/16/2013 2:11 PM, Mike T wrote:
> >I've been trying to research what the circuit
> differences are between the RBZ and RBZ Special. The
> difference on paper is that the RBZ covers from 2.0mc to
> 5.8mc whereas the Special covers from 5mc to 13mc. From the
> limited information I've been able to find it seems like the
> conversion was a field conversion that involved little more
> than realigning the receiver and changing the dial face for
> a new one. I spent some time today attempting to do just
> that on my RBZ and found that the RF and OSC trimmers would
> only give about +/- 300khz of adjustment. I'm not sure where
> they found an extra 7mc or so. Does anyone have any
> information or ideas?
> >
> >- Mike
> 

Robert & Susan Downs - Houston
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MVPA 9480