Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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The final filaments are in series with most of the receiver tube
filaments, so if the receiver is working, that is not the problem.
The bias supply should be variable from approx -45 to -85V. The screens
should have approximately 250 VDC, current limited to less in X-CW. The
plate voltage is 650 VDC. IF these voltages are present, and the
cathodes are grounded through the 15 ohm cathode resistors, you should
be able to adjust the bias for the 0.1A idle current. The system is the
same as the T-4XC, just one more tube. Same rules.
73, Garey - K4OAH
Boyd Van Horn wrote:
Carl, Check the filaments on the finals. They are all three in
parallel and drop the 12.6 volts to 6.3 for the remainder of the
tubes. The wires to the filaments are small and brittle. Measure the
Bias voltage coming out of the power supply- should be at least -65
and you should be able to reduce it to zero. When you go to X-CW you
should have 350 volts on the final screens and when you go to ssb the
voltage should go to 650 volts. Be Careful !!! Also the sealed
transmit /receive relays are known to go bad. If you need one you can
order from Mouser in Texas- the manufacturers part number is
R10-EIY4-V2.5K. Good Luck, Boyd
*/Garey Barrell <[EMAIL PROTECTED]>/* wrote:
Garey Barrell made an utterance to the drakelist gang
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Carl -
No. No modifications are necessary to use the 6GJ5. Pin 8 is no
connection in the 6GJ5, and is the suppressor grid on the 6JB6,
which is
grounded.
You say NO plate current. Do you have bias current?
Garey - K4OAH
St Charles, IL
[EMAIL PROTECTED] wrote:
> [EMAIL PROTECTED] writes:
> abbreviated excerpt below
>
> The 6GJ5's will work fine....... Garey - K4OAH
>
> Hi, TR4 will not tune up...no plate current...have been advised
that
> 6GJ5's may have to have pin 8 cut off.
> Your thoughts.
> Carl Hibbard WD8NHK
>
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