[Hammarlund] HQ-129

[Rodger]

Joe,

The 6H6 sounds like it has been replaced with a couple of diodes, the 
6H6 is a duo diode tube and the two things that look like resistors are 
probably just some little solid state replacements for it.  You can 
leave them in place if you wish and they should be fine.

It sounds like perhaps the BFO has been replaced with a crystal 
controlled unit and perhaps this is a product detector mod.  You will 
have to go inside the box to find out for sure what has been done.  
Since the HQ-129 is already set up to use a crystal filter I would doubt 
that this box is the filter but when someone modifies a receiver 
anything is possible.

I have seen Argonne caps before but I have no idea how old they are;  
you could test a few to see if they are leaking.

The HQ-129 is a very capable receiver. 

73, Rodger WQ9E


Joe Connor wrote:
> I just picked up a nice HQ-129 and am looking forward to getting it into tip-top shape. I've noticed a few mods and want to get some information on what these mods are and if they are worth keeping:
>
> 1. The 6H6 has been replaced with a socket containing what looks like a couple of resistors;
>
> 2. The 6SJ7 has been replaced with a socket going to a floating metal box. On the outside of the box is a 455 kHz crystal; and
>
> 3. Some of the original paper caps have been replaced with Argonne brand caps (white with blue lettering). Has anyone ever heard of this brand? About how old are they and what kind of quality?
>
> As always, thanks for your assistance.
>
>                         Joe Connor
>
>
>       
>
> ______________________________________________________________
> Hammarlund mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hammarlund
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Hammarlund at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
>