Date: 11 Feb 90 06:27:32 GMT From: philmtl!philabs!briar.philips.com!rfc@uunet.uu.net (Robert Casey) 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@NYNET 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 @ VE3JF 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 @KD6TH-4 MailBox> ------------------------------ Copied from the QRZ! Windows Ham Radio CDROM