[R-390] Tube Swapping in IF Deck

[hamfish at comcast.net]

Bet Roger's post & others will be found in https://r-390a.net/Pearls/sensitivity_alignment.pdf

Craig:WD8KDG

-----Original Message-----
From: Barry Scott <72volkswagon at gmail.com> 
Sent: Tuesday, October 15, 2024 8:40 AM
To: hamfish at comcast.net
Cc: R-390 Mailing List <r-390 at mailman.qth.net>
Subject: Re: [R-390] Tube Swapping in IF Deck

I don't see any posts from that date in the version of the Pearls I'm looking in.  Maybe it's in a different version somewhere?

Thanks,
Barry - N4BUQ

On Tue, Oct 15, 2024 at 10:34 AM <hamfish at comcast.net> wrote:
>
> Barry & All,
>
> I saved that reply from Roger KC6TRU, dated Monday, September 26, 2005 
> @ 6:35PM. Most likely saved in Pearls? Someone might need a warehouse 
> full of vacuum tubes. I'm glad to have a few replacements.
>
> Regards,
> Craig:WD8KDG
>
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> On 
> Behalf Of Barry Scott
> Sent: Tuesday, October 15, 2024 8:12 AM
> To: R-390 Mailing List <r-390 at mailman.qth.net>
> Subject: [R-390] Tube Swapping in IF Deck
>
> I seem to recall a post many years ago from Roger Ruszkowski regarding 
> swapping tubes in the IF and/or RF deck to get the best performance.
> I think he suggested swapping specific pairs and moving through the 
> deck that way but I don't quite remember the process.
>
> There's a post in the Pearls dated Fri, 1 Apr 2005 23:37:52 EST from 
> Roger that touches on this but I'm not sure that's what I'm thinking 
> of.  I may be thinking of just a process for the RF deck's mixers and 
> not the IF deck but, again, the memory is distant.
>
> Anyone know what I'm talking about and, possibly, familiar with that 
> process?
>
> Thanks,
> Barry - N4BUQ
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