[R-390] Differences in 390A IF decks

[John Bunting]

Motorola's Order No. 14-PH-56 was the first order that required the order 
number and the serial number to appear on all modules.  Partway through that 
order the three fuse modification was made too.

John, W4NET

----- Original Message ----- 
From: "Tom Norris" <r390a at bellsouth.net>
To: <r-390 at mailman.qth.net>
Sent: Monday, August 15, 2005 09:43
Subject: Re: [R-390] Differences in 390A IF decks


> Tim, you know that, and I know that. I had posted the links for the 
> benefit of those that didn't or for those that collect photos for no  good 
> reason. Or for good reason, either one. I think there is at  least one, 
> who I forget, that likes new and different pix taken.
>
> On Aug 15, 2005, at 4:43 AM, Tim Shoppa wrote:
>>
> [snip]
>> I assume you're talking about the fixed rather than variable caps
>> around the filters?
>>
> yup, and the fact it's a Collins [Blessed be Art, etc] AFAIR all the
> Motorola and Collins decks pre 1954 had fixed caps. I suppose most
> Mot/Col decks out there will be capless, since they weren't made
> past '56. An odd thing about the deck in the photo - there is no
> contract number marked anywhere on the thing. Just a Collins p/n and
> a serial. The other Collins 390A's I've had had the contract numbers,
> at least I think so. I may have been hallucinating at the time, though.
> heehee
>
> Tom M reminded me of the different sheet metal design and other things
> that were used in later contracts by EAC. I may also do comparison pix
> showing those as well, I probably have an extra EAC module around here
> somewhere. (rummage rummage)
>
> Tim asks: "What exactly is that doo-dad in the ballast tube socket?"
>
> The doo-dad?  It's a "Modified Horizontal Low Resistance Current Pass
> Device"  Which means I have a 9-pin shorting plug underneath instead of
> a b*11*st. The tube shield and label are there for effect, since the 
> radio
> is going out the door to someone with an odd sense of humor. I used
> 12BA6's for PTO and BFO. The radio is an Amelco, but it's a mutt. While
> it has an Amelco RF deck and P/S, the IF is Collins and the audio is
> Stewart-Warner. Now if the p/s were Helena-Rubenstein, we'd be
> all set.... hehe
>
> 73
>
> Tom NU4G
>
>
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