[Boatanchors] Hammarlund HQ-160...

[JAMES HANLON]

Gary,

You wrote:

Message: 5
Date: Tue, 2 Jul 2024 08:54:03 -0600
From: "Gary Peterson" <kzerocx at rap.midco.net>
To: <boatanchors at mailman.qth.net>
Subject: [Boatanchors] Hammarlund HQ-160...
Message-ID: <6D4953445B3E4CFDA1D2F7C160D49B69 at WIN7Tower>
Content-Type: text/plain;       charset="iso-8859-1"

I recently acquired a cosmetically cherry Hammarlund HQ-160.  It has low sensitivity on all bands, particularly the higher two, where it uses double conversion.

In doing measurements, I find that the resistance from pin 1 to ground on V4 (6BE6) measures 44.3 K ohms, instead of 22 K ohms.

Therefore, I believe that R 13, which is inside of the 2nd converter module, mounted on top of the chassis, has changed value.

It is not obvious to me how to remove the 2nd converter module, with T2 and the 6BE6 tube, in order to replace the resistor.

Does anyone have experience as to how to remove this module?

Thank you, in advance, for any time taken to reply to my question.

Gary Peterson, KzeroCX

Rapid City, SD

If you can't get into that converter module easily, you could always add a resistor externally that would wrap around pin 1 of the 6BE6 and go to ground.  Another 44K, perhaps two 22K resistors in series, in parallel with the existing resistor would bring the net value down to 22K.  It would let you evaluate the improvement that restoring that resistor to its original value would make on the low sensitivity without doing major surgery on the receiver.  I know it is a bit of a kluge, but no-one but you would ever know about it.

Jim, W8KGI