[Hammarlund] HQ-120X QUestion (6F8)

[Carl]

Have you measured all of the resistors in the radio for tolerance?

Carl
KM1H


----- Original Message ----- 
From: "Joe Connor" <joeconnor53 at yahoo.com>
To: <hammarlund at mailman.qth.net>
Sent: Friday, March 04, 2011 6:05 PM
Subject: [Hammarlund] HQ-120X QUestion (6F8)


>
> Guys, I need some advice.
>
> There are at least two different verisions of the HQ-120X. One difference 
> that I've noticed is the wiring of the 6F8.
>
> On the version I have, one of the grids of the 6F8 is fed by a 20K 
> resistor and one of the cathodes is grounded. (On Bama, this is the 73 KB 
> schematic). On the other version, one of the grids of the 6F8 is fed by a 
> 10K resistor and one of the cathodes goes through a 230 Ohm resistor to 
> ground. (Om Bama, this is the 614 KB manual). I have no idea which version 
> came first.
>
> Is one better than the other? Should I reduce the 20K resistor to 10K on 
> mine and put a 230-Ohm resistor between the cathode and ground?
>
> I am in the process of replacing caps and out-of-spec resistors. The 
> receiver is performing well but the audio gain is a bit less than I 
> expected. (Maybe my SX-28 has spoiled me!).
>
> As always, thank you for your advice and guidance.
>
>
>                                     Joe Connor
>
>
>
>
>
>
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