Wisconsin Parts Database Instructions and Discussion Team/Group   >   ILLINOIS   >   Motors and tools   >   Replace   >   New   >   Without Warranty   >   Yaesu ft-200S tube set 6JS6A (1) + 12BY7 driver

Yaesu ft-200S tube set 6JS6A (1) + 12BY7 driver


Matched Pair 6JS6A (1) + 12BY7/A Driver for Yaesu FT-200S (Low Power Ft-200)
Single 6JS6A/B (2) and a 12BY7/12BY7A driver tube. Test better than new on my Hickok 580 tube tester and should work great in your ham rig. Also passes the LIFE TEST on the Hickok which assures long life and high output. This is a great matched gain set with a driver tube.
under my wing and a very high satisfaction rate. If you have a major problem, email me and I am sure we can work it out. I also can't guarantee they will work in your equipment or they will test the same on your tube tester but that they do test new or better on my equipment and I have had less than 1% returns for any tubes I have sold!
Yaesu tube transmitters FT-101 series neutralization
There will come a time when the finals in your FT101E will need replacing. The FT-101 transceivers were originally equipped with 6JS6A tubes manufactured by NEC and Toshiba. Other manufacturers (including USA) tube properties are slightly different from the original 6JS6A tubes. Therefore, 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.
Schematic of FT-101 Power Amplifier 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 re-neutralizing, 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 "dips" (Ic meter position) on both sides of the peak when tuning the PLATE control. WARNING! You are tuning a capacitor in the High Voltage compartment, +600 Volts are present! Always use non-metallic tuning tools. After neutralization, reset the bias to 60ma with CARRIER and MIC settings at minimum.