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SQ9NRF > TECH 30.12.02 03:25l 41 Lines 1992 Bytes #999 (0) @ WW
BID : D50154SQ9NRF
Read: GUEST OE7FMI
Subj: Replace finals in FT-101E
Path: DB0MRW<DB0RGB<OE5XBL<OE3XSR<OK0PBX<OK0PHK<OK0NAG<OK0PPL<RZ6HXA<SP7MGD<
SQ5BAQ<SR9ZAA<SR9BKR<SR9BKA
Sent: 021229/2329Z @:SR9BKA.#KAT.POL.EU #:42362 [Katowice] FBB7.00g $:D50154SQ9
From: SQ9NRF@SR9BKA.#KAT.POL.EU
To : TECH@WW
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.
*************** SQ9NRF *****************
* op : Pawel *
* tel : 503903082 *
* email: sq9nrf@poczta.fm *
* BBS : SQ9NRF@SR9BKA.#KAT.POL.EU *
* *
*************** VY 73! *****************
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