Tony, check CR19 in the cathode circuit of the 12BY7 driver. You can check it
with the rig unpowered (safest method) with a VOM or DMM in the resistance
mode. The diode may test OK when cold. Touch a soldering iron to either end of
the diode. If the diode is intermittent, the heat will cause the diode to open.
It happened to one of my T-4XCs. I replaced the B5G5 diode with a 1N4003 (or
1N4007).
73 ES GL,Bob K9JUMaryville, TN
On Saturday, February 2, 2019, 12:00:16 PM EST,
[email protected] <[email protected]> wrote:
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Today's Topics:
1. test (Thom LaCosta)
2. Additions and Changes to DrakeList Resources (Thom LaCosta)
3. T4XC Drive at grid of finals (Tony Angerame)
----------------------------------------------------------------------
Message: 1
Date: Fri, 1 Feb 2019 15:43:03 -0500
From: Thom LaCosta <[email protected]>
To: [email protected]
Subject: [Drakelist] test
Message-ID:
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please disregard this
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Message: 2
Date: Fri, 1 Feb 2019 17:43:00 -0500
From: Thom LaCosta <[email protected]>
To: [email protected]
Subject: [Drakelist] Additions and Changes to DrakeList Resources
Message-ID:
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DrakeList - New Resources
The Old Web based forum died....one of the updates managed to mangle the
database. Sorry, all content was lost, and the automatic backup was of the
mangled system...
Drakelist New Forum
http://zerobeat.net/drakelist/smf/
Please feel free to join and participate.
Because of support chores of one nature or another, I participate in
Facebook. I've created a Facebook Page and a Group for your use:
Drakelist Facebook page
https://www.facebook.com/RL-Drake-Amateur-Radio-Equipment-343521779825105/
shortened version https://tinyurl.com/drakelist-page
Drakelist Facebook Group page
Facebook https://www.facebook.com/groups/398608380873040/
Shortened version https://tinyurl.com/drakelist-group
Possible Addition
I am considering setting up a mailing list...it would be a one-way affair
used to notify list members of changes/additions/events that may be of
interest to Drake users.
Let me know your thoughts on that.
Looking forward to seeing everyone in these new venues.
73,
Thom K3HRN
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Message: 3
Date: Fri, 1 Feb 2019 16:49:47 -0800
From: Tony Angerame <[email protected]>
To: [email protected]
Subject: [Drakelist] T4XC Drive at grid of finals
Message-ID: <[email protected]>
Content-Type: text/plain; charset=utf-8; format=flowed
Hello All,
I have no output on any band. This problem has been intermittent now is
all the time. I have just one replacement 6jb6 so I swapped them one and
the other. There is a correct bias current at idle. I checked the grid
of? 6jbs's it was measured at 2.5 VoltsPP. My scope measures freq by
measuring the time between two peaks. It comes out to be the frequency
of operation or in this case 3700 Khz. I have gone through the alignment
I found them a little difficult without repeating them again.
What voltage should I see at the grid of the finals?
Thanks, Tony WA6LZH
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