Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Ted -
OK. If all the electrolytic caps are original in that supply, you might
want to consider the AC-4R board from Mike Bryce at the "Heathkit
Shop". It replaces just about everything but the transformer and cabinet.
You can probably get a few more years out of the neon indicator in the
R-4B by clipping out resistor R150. It's on the small board underneath
the chassis below the PTO. The bulb can be replaced, which is the
"real" problem, it's an NE-2E, but it can be difficult to find one which
will fit in the little housing behind the knob. Apparently there is
quite a variation in the "length" of these bulbs, and the housing needs
a "short" one. It is also a three-hand job to replace, hence the "clip
out R150" advice from Drake!
73, Garey - K4OAH
Atlanta
Drake 2-B, 4-B & C-Line Service Supplement CDs
<www.k4oah.com>
Ted Wright wrote:
Well it seems that the supply has went south i have lost biasing
probably a bad cap. Here is the funny thing when i grabbed another
supply know to work the rig cycled in and out of transmit six times
each time it did this the neon lamp that never works on the receiver
flashed on and off . Very strange It now works at the cost of my
6jb6's they went south I swapped out the vox tube for a know good
tube as well So all is working again but the bad supply . Funny thing
is I just had the diodes replaced in it .
I wonder if a bad cap was weakening other components in the supply .
The tubes i replaced were a old pair of 6jb6's I knew they worked but
thought they worked at 70% or so at best but after adjusting the bias
on the other supply I now see a nice bit of output when tuning into my
dummy load. So the lesson learned here is the transmitter stays off
unless I'm here with it .
Thanks all for your help this group is a tremendous wealth of
knowledge and a great asset to its users.. best 73 to all
ted n3zrx
Garey Barrell wrote:
Garey Barrell <[EMAIL PROTECTED]> made an utterance to the
drakelist gang
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Ted -
1. Check the bias supply. A failure in the bias supply can severely
damage the transmitter & power supply, even if the transmitter is in
standby.
If bias voltage is ok, (verify Final stage idle current is, or can be
set to, 0.1A).
2. Try another 6EV7.
3. Bridge C129 with a good electrolytic.
If still a problem, report back!
73, Garey - K4OAH
Atlanta
Drake 2-B, 4-B & C-Line Service Supplement CDs
<www.k4oah.com>
Ted Wright wrote:
Ted Wright <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Hi Guys
My twins have developed a problem . The transmitter rite after warm
up goes into transmit and will not come out unless I turn it off .
Is this a common problem ?? It is new to me as my drakes are the
pride of my fleet over here and this is very frustrating to me not
knowing what or how to fix such a dilemma!!
Does any one have any suggestions??
tnx Ted
n3zrx
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