06-29-2013, 06:53 PM
OK, it only took me 5 months to get around to it, but I finally got this thing receiving on-air radio today.
I opened up the power transformer and covered everything up with several wraps of electrical tape, then put it all back together. I checked resistance from every wire to the frame- all good.
I made a new bias resistor network with a short terminal strip and 7 watt resistors.
Plugged it in without tubes just to make sure nothing is going to blow the fuse- no fireworks encountered.
Installed the tubes and fired it up. No loud buzzing, so that problem is fixed. Clicked it from SW to BC to Pre-sets to Phono, there's an audible pop from the speaker with each change of input. Turned on the sig gen and fed a signal through a .1mfd cap to the antenna input and checked through the broadcast band and SW band- it makes good audio tone.
Lastly, I connected a homemade antenna to it (stock antenna and cabinet are 12 hours away) and dialed up a few local AM stations. They come in OK, but I'm sure this will need a good alignment. All the presets work, too.
I am darn happy to finally have this thing working again.
Now it's time to tackle the Beam-Of-Light. 8)
I opened up the power transformer and covered everything up with several wraps of electrical tape, then put it all back together. I checked resistance from every wire to the frame- all good.
I made a new bias resistor network with a short terminal strip and 7 watt resistors.
Plugged it in without tubes just to make sure nothing is going to blow the fuse- no fireworks encountered.
Installed the tubes and fired it up. No loud buzzing, so that problem is fixed. Clicked it from SW to BC to Pre-sets to Phono, there's an audible pop from the speaker with each change of input. Turned on the sig gen and fed a signal through a .1mfd cap to the antenna input and checked through the broadcast band and SW band- it makes good audio tone.
Lastly, I connected a homemade antenna to it (stock antenna and cabinet are 12 hours away) and dialed up a few local AM stations. They come in OK, but I'm sure this will need a good alignment. All the presets work, too.
I am darn happy to finally have this thing working again.
Now it's time to tackle the Beam-Of-Light. 8)
It's not how bad you mess up, it's how well you can recover.