I was searching for Hammarlund HQ-100 wisdom when Google pointed me to the Electric Radio articles of Janis AB2RA. They were in ER #380 and #381 (February and March 2021). Lots of good stuff in there.
This morning I happened upon a 2014 SolderSmoke blog post (as you do) about
my Tuna Tin 2. Turns out that Janis was my first contact with this rig.
And she too was running a homebrew rig. TRGHS. https://soldersmoke.blogspot.com/2014/03/i-too-built-tuna-tin-2.html
I continue to work on my HQ-100. The AC hum is getting worse so I have
ordered a replacement capacitor can from Hayseed Hamfest. But I was a bit confused about which cap to order. Hayseed has two caps listed for the
HQ-100 -- one (it seems) for the early model of this receiver and one for
later models. Is that right? Did Hammarlund update the power supply to
add filter capacitors? Take a look: https://hayseedhamfest.com/collections/hammarlund