[R-390] Series 500 IF Module

[Tom M.]

The small added transformer was for hum bucking on the PTO. I originally thought it was for IF filaments but that’s not the case. 


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On Monday, May 27, 2024, 5:57 PM, francesco.sartorello via R-390 <r-390 at mailman.qth.net> wrote:

Hi all, will be home next week and will dig for the 725 manual, I remember that a small power transformer was certainly added to supply the IF chassis with 26Vac for the filaments. Do let me know all the info you need! Best, Francesco Sartorello  Sent from my steam powered device!
-------- Messaggio originale --------Da: Francesco Ledda <frledda at att.net> Data: 28/05/24  00:16  (GMT+01:00) A: gary.biasini at shaw.ca Cc: "francesco.sartorello" <francesco.sartorello at virgilio.it>, Larry Haney <larry41gm2 at gmail.com>, R-390 Forum <r-390 at mailman.qth.net> Oggetto: Re: [R-390] Series 500 IF Module Gary… too many Italians in this small group!Sent from my iPad> On May 27, 2024, at 16:55, gary.biasini at shaw.ca wrote:> > Francesco Ledda,> > Thanks for replying.  My message was aimed at Francesco Sartorello as it appears that he has some documents.> > Best regards,> > > -----Original Message-----> From: Francesco Ledda <frledda at att.net>> Sent: Monday, May 27, 2024 3:25 PM> To: gary.biasini at shaw.ca> Cc: francesco.sartorello <francesco.sartorello at virgilio.it>; Larry Haney <larry41gm2 at gmail.com>; R-390 Forum <r-390 at mailman.qth.net>> Subject: Re: [R-390] Series 500 IF Module> > Gary,> > I don’t think I have any pertinent information related to the R-725. If I had it, I would share it.> > Best, Francesco K5URG> Sent from my iPad> >> On May 27, 2024, at 16:19, gary.biasini at shaw.ca wrote:>> >> Francesco,>> >> Ciao. Would you be willing to share the information so that we can put it on the R-390a.net website?>> >> Thanks for considering.>> >> Gary Biasini>> >> -----Original Message----->> From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> On Behalf Of francesco.sartorello via R-390>> Sent: Monday, May 27, 2024 1:55 PM>> To: Larry Haney <larry41gm2 at gmail.com>; R-390 Forum <r-390 at mailman.qth.net>>> Subject: Re: [R-390] Series 500 IF Module>> >> Gang, a few years ago Robert Downs sent me a copy of the 725 manual with all the variations to the original 500 module, including filament supply from a stock 390A, mail him!Ciao, FrancescoSent from my steam powered device!>> -------- Messaggio originale --------Da: Larry Haney <larry41gm2 at gmail.com> Data: 27/05/24  17:26  (GMT+01:00) A: R-390 Forum <r-390 at mailman.qth.net> Oggetto: Re: [R-390] Series 500 IF Module Hi  Byron,  The 2 places I know of for R725 info is 'google 'R725 bama''and on R-390A Rebuild Part3 (radioblvd.com)<https://www.radioblvd.com/R390A_Rebuild_Part3.htm>.  Have fun.Regards, LarryOn Mon, May 27, 2024 at 6:46 AM Byron Tatum <bjtatum1 at att.net> wrote:> Hello-    I am considering converting an R-390 IF module to fit into an> R-390A mainframe. I have some info on this but have seen posts that a> schematic for the actual Servo Corporation Series 500 IF module exists. I> have searched for one to no avail.     I was hoping to find this schematic> to compare it to the R-390 IF module and aid in the conversion.     Also, I> would like to add any R-725 technical info that is available to my files> here in order to study.     Will pay any costs incurred if copying is> required.Thanks all,Byron W5FH> ______________________________________________________________> R-390 mailing list> Home: http://mailman.qth.net/mailman/listinfo/r-390> Help: http://mailman.qth.net/mmfaq.htm> Post: mailto:R-390 at mailman.qth.net>> This list hosted by: http://www.qsl.net> Please help support this email list: http://www.qsl.net/donate.html______________________________________________________________R-390 mailing listHome: http://mailman.qth.net/mailman/listinfo/r-390Help: http://mailman.qth.net/mmfaq.htmPost: mailto:R-390 at mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: htt> > 
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