Hi All,
Hope everyone had a great 4th! Sorry I've been absent on keeping up with this thread. I've been on vacation for the past 8 days and, although this board is rather narrow in audience, I generally don't make announcements on the internet when my house will be empty for a week
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/smiley.gif)
The one update I have is, the Marketplace gods have shined upon me, and this afternoon I picked up a "mostly" complete 8566 A/B (A converted to B) that happened to be for sale locally. The RF section is missing the entire A11 assembly, and it's also missing the 2nd Mixer from the A6. Otherwise the unit is complete, including the entire display section. The price was, let's just say, hard to turn down
![Cheesy :D](https://www.eevblog.com/forum/Smileys/default/cheesy.gif)
So far the only thing I've had time to test is swapping out the A6A7 current driver, which made no difference. In fact, I'd say the red light shone brighter than ever. At one point it went out briefly, then came right back on at full brightness. I didn't expect that to change anything but it's extremely easy to swap out, so I started there.
Also, one clarification. I had previously mentioned I swapped out the YIG. I was referring to the "YIG Tuned Mixer, aka the YTX A6A8,
not the A11A4 YIG Tuned Oscillator, in case that had caused any confusion. I haven't touched anything in the A11 section.
Pic below of the parts unit.