[Hammarlund] HQ129X Distortion

[Skip Frolik]

Evening guys,
The mixer tube in the HQ129X I have in storage has the 6X8A mod.
Extremely well done complete with shielded socket and tube shield.
Now that I know this I'll keep my eye out for one of those 60's
articles so I can put a copy in the documentation for the receiver.
Thanks again.
Skip
WB4GMQ

-----Original Message-----
From: jeremy-ca [mailto:km1h at jeremy.mv.com] 
Sent: Sunday, April 06, 2008 9:23 PM
To: Skip Frolik; Hammarlund at mailman.qth.net
Subject: Re: [Hammarlund] HQ129X Distortion

There were several mixer mods in the ham rags thru the 60's. A popular one 
used a 6X8 (6U8A/6EA8). It could also have been an adaption of any number of 
other circuits with a 12AT7, 7360, etc.
In recent years the Pullen mixer has had a renaissance with the 6ES8 being 
an excellent choice.

A less complicated swap for an original 6K8 is the 6SB7Y which gives a nice 
improvement but not earthshaking. BUT then change the RF amp to a 717A and 
the old girl will wake right up and compare(or excel)to the 140X and similar 
miniature tube offerings.

Carl
KM1H
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