[Boatanchors] RME 69 Crystal Filter and Cc/C adjust

[Al Klase]

Gang,

Hi-res scans from original RME-69 documents have been posted: 
http://www.skywaves.ar88.net/commrx/RME/RME.html

This should clear up the crystal-filter schematic issue.  Their rambling 
verbal explanation is another matter entirely.

Al

On 4/14/2013 1:14 PM, Al Klase wrote:
> Hi Bill,
>
> I have my 69 on the bench, and it appears my restoration and alignment 
> efforts of the late '90 have held up.
>
> The positions of the Crystal Filter Switch (B) (upper right corner) 
> are, left to right, OUT - SERIES - PARALLEL
>
> The Crystal Selectivity (E) variable capacitor, CH, is just below the 
> switch.
>
> I'm blessed with an original copy of the documentation, and the switch 
> connections are clear, unlike all the third-order scans on the web..
>
> It's a single-pole three position switch, with the common terminal 
> connected to the grid of the 6D6.
> In the left-hand position, it shorts out the crystal for full 
> frequency response.
> In the middle position it does nothing.  This allows "normanl" crystal 
> filter action.
> In the right-hand position it shorts out the "phasing capacitor" CI, 
> the trimmer inside the filter can.
>
> Sandy's right, your going to need a crib sheet for the unmarked front 
> panel.
>
> I strongly suggest you replace ALL the paper caps before you attempt 
> alignment.  DON'T EVEN TRY TO TUNE JUNK!
>
> I'll try to get this stuff posted to my website soon. 
> http://www.skywaves.ar88.net/commrx/RME/RME.html
>
> Good luck,
> Al
>
> On 4/14/2013 10:58 AM, Bill Carns wrote:
>> I am doing my first alignment of a RME 69 receiver.
>>
>> I am having trouble reading the schematic in the area of the crystal 
>> filter
>> but there is apparently some confusing info.
>>
>> There is not much in the manual about the switch positions for the 
>> filter
>> selector switch. In the alignment section it refers to the middle 
>> position
>> of the switch as the "Series" mode position.....fine.
>>
>> That implies that there is a "Parallel" mode position...  ??? Maybe.
>>
>> There appear to be three positions of the switch..   10:00, 12:00 
>> (Series)
>> and 2:00.   But, in the schematic there appear to be only two 
>> positions and
>> it is not clear what the wiring is in each position, or which 
>> position it is
>> shown in..
>>
>> I want to understand this guy before I leap in.
>>
>> Also, anyone out there have any words of wisdom for setting the C and 
>> C(c)
>> capacitors that appear to be a "factory Setting on Band one, but 
>> "Should be
>> kept to an absolute minimum, so as not to degrade the upper bands.
>>
>>
>> 75 years later, I am not sure I trust the "factory" settings for C 
>> and Cc,
>> which could have shifted or been messed with along the way.
>>
>>    Any   ....  HELP !  is appreciated.
>>
>> Bill
>> N7OTQ
>>
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/