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Date: 11 Feb 90 06:27:32 GMT

From: philmtl!philabs!briar.philips.com!rfc
Subject: FT101E mods so you can use USA final tubes



copied from packet:

 Msg# TSF  Size #Rd Date/Time MsgID        From   To

17464 BF   2446   1 0131/0304 44022_VE3JF  VE3OSN MODS
  Sb:Final Mods - Yaesu FT 101E



  PACKET BID:44022_VE3JF



  Here's an old modification that's been around for a few years.  I had

  occasion to use it recently myself, so it may be of value to someone

  else  I am not sure of its origin, I may have picked it out of an old

  QST.  Anyway, it works.



  73  -Bob-  VE3OSN




          REPLACING FINALS IN FT101E TRANSCEIVERS

           ---------------------------------------



 There will come a time when the finals in your FT101E will need

 replacing.  These transceivers were originally equipped with 6JS6C

 tubes manufactured by NEC.  This tube's properties are slightly

 different from the 6JS6C tubes available today from American tube

 manufacturers.  By the way, don't bother looking for tubes made by

 NEC.  They got out of the business several years ago.



 In order to use the "American" variety 6JS6's, a simple modification

 to the neutralization circuit must be made to the final section of the

 transceiver.



 The modification consists of replacing the fixed value 100 pf 1000 VDC

 mica capacitor with a 10 pf 1000 VDC mica capacitor.  This capacitor,

 C125, is in series with the 10 pf variable neutralizing capacitor off

 of the plate circuit.



If this modification has not already been completed on your rig, be

sure to use a mica or silver mica of at least 1000 VDC.  Do not

substitute a different type, because the heat in the final compartment

will change the value, and your tubes will fail prematurely.  Also, be

very careful to keep all leads short and in exactly the same

orientation as the original capacitor.



Before reneutralizing, open the variable neutralizing capacitor all the

way to minimum engagement and follow the neutralizing instructions in

the manual.  While dipping the plate, remember to adjust the

neutralizing capacitor for equal value meter reading peaks (IC

position) on both sides of the dip when tuning the "Plate" control.

                                                           2352z, 1886

Note:I haven't tried this, proceed at your own risk WA2ISE

                                                           last

                                                          
                                                           MailBox>



------------------------------




SOURCE: The QRZ Windows Ham Radio CDROM



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