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[TenTec] Titan II Bias issue

To: tentec@contesting.com
Subject: [TenTec] Titan II Bias issue
From: kr7o@vhfdx.com
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Mon, 20 Mar 2017 22:27:05 -0700
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
I am repairing an amp that was from a friend's estate and have fixed several issues, but now when I switch the amp to Operate, considerable heat is coming out of the exhaust, so it appears the tube is partially biased on all the time. I have loaded the amp many times up to about 1kw output, so I am reasonably confident that the tube is OK.

According to the manual, the cutoff voltage is supposed to be -130v, but with 70vac on the primary into a half wave bridge, I cannot understand where they are getting -130v from. My bias voltage is only -80v in RX. I get up to -95v with the bridge unloaded, which is close to what would be expected from a half wave bridge. The screen voltage supply appears to be functioning normally.

I will admit, I am not much of a tech, but I DO know how to work around high voltage and avoid exposed plate voltage unless absolutely necessary. I have gotten this far, and would love to get this amp running if anyone has experience with this amp and does not mind helping me sort this out. I have more history and measurements, but I will spare the list.

Thanks,


73, Robert KR7O/YB2ARO, DM07ba/OI52ee  (ex.  N7STU)
DXCC  6M #1122
WAZ  6M #112
VUCC  6M, 2M

www.vhfdx.com (KR7O/YB2ARO pages)
Looking for old VHF QSL cards and logbooks.


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