DX-60B Final Amp Question

[Garey Barrell]

Ed -

-79 V on the grid of a 6146 will cut it off completely.  I would
expect more like 30-40V to give you some "key-up" plate current.
  I don't have a schematic for the DX-60, but I would look at the
bias source.  The grid bias is probably from a resistive divider,
and is probably keyed since I think the DX-60 is grid block
keyed.  You most likely have a resistor that has changed value.

That high a bias voltage would probably cause clicks on your
signal.   Ohmmeter checks of the resistors in the bias divider
should show you the culprit!

73, Garey - K4OAH
Atlanta


>>Hello,
>>     When operating my DX-60B, everything appears normal; power
>>     output,
>>drive current, plate current, etc.  Unit tunes up fine; 60 watts out.
>>The only thing I don't see is the key-up final plate current of 5 to
>>20 ma. I don't see any current at all on the meter in the key-up
>>condition (function sw in CW position).  Voltages seem correct (except
>>bias on pin 5 of the final seems high at -79 volts), but otherwise all
>>looks ok.  Any ideas? --Ed G--

-----------------------------------------------------------
Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.asp?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://interactive.tempe.gov/archives/HEATH.html