12-16-2019, 06:48 PM
OK Russ, thanks. Of course I don't have any suitable shielded wire. So I have ordered some, after checking that 22 gauge wire would safely handle the current of three tubes plus four LED dial lamps (it will). The wire I ordered, from Mouser, has PTFE insulation so it is more resistant to soldering iron heat. While I was at it, I also ordered enough mica capacitors to replace all 473 micas in the Magic Brain.
(No, it doesn't use quite that many mica caps...but it seems like it)
I suppose as long as I am doing this right, I should perform the 6SG7 mod as well? This mod replaces the 6K7 RF amp tube with a 6SG7. The 6SG7 will ensure that band "D" (23 to 60 mc) will work across the entire band, not just the low end as with most 6K7 tubes. It requires a new octal socket with all eight pins - the 6K7 socket is missing the contact for pin 6.
But then again, what can be received between 23 and 60 mc utilizing amplitude modulation these days? Hmmm. Upon second thought, it seems like a lot of work for little or no return. I don't think I will do that.
I'm not going to work on the Magic Brain tonight. Maybe I will tomorrow night.
(No, it doesn't use quite that many mica caps...but it seems like it)
I suppose as long as I am doing this right, I should perform the 6SG7 mod as well? This mod replaces the 6K7 RF amp tube with a 6SG7. The 6SG7 will ensure that band "D" (23 to 60 mc) will work across the entire band, not just the low end as with most 6K7 tubes. It requires a new octal socket with all eight pins - the 6K7 socket is missing the contact for pin 6.
But then again, what can be received between 23 and 60 mc utilizing amplitude modulation these days? Hmmm. Upon second thought, it seems like a lot of work for little or no return. I don't think I will do that.
I'm not going to work on the Magic Brain tonight. Maybe I will tomorrow night.
--
Ron Ramirez
Ferdinand IN
