07-18-2014, 07:57 PM
OK...though tube lineup is the same, this is....a superhet-regen. Like Philo 80 jr.
Wow.
I traced the backside trimmer cap to the anode of 6F6 and it goes in series into the IF can, The other side having few Ohms to Gnd.
I think it is like here
http://www.nostalgiaair.org/PagesByModel...013843.pdf
see cap 18.
Now the top chassis Padder is the low freq heterodyne adjustment.
The can top two trimmers, as I thought, are IF caps.
No wonder the back cap did not adjust the requency...not its purpose.
Though I do not think I will get stellar results, I will try one more stab at alignment.
1. 456Khz If, two trimmer in the can,
2. 550khz low side
3. 1700khz tuning cap trimmer
4. Regen birdies / motorboat borderline.
Wow.
I traced the backside trimmer cap to the anode of 6F6 and it goes in series into the IF can, The other side having few Ohms to Gnd.
I think it is like here
http://www.nostalgiaair.org/PagesByModel...013843.pdf
see cap 18.
Now the top chassis Padder is the low freq heterodyne adjustment.
The can top two trimmers, as I thought, are IF caps.
No wonder the back cap did not adjust the requency...not its purpose.
Though I do not think I will get stellar results, I will try one more stab at alignment.
1. 456Khz If, two trimmer in the can,
2. 550khz low side
3. 1700khz tuning cap trimmer
4. Regen birdies / motorboat borderline.
